air handling units makes every breath a high quality breath

Air Handling UnitsMakes every breath a high quality breath.

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Blue Star is India’s largest central air conditioning and commercial refrigeration company, with over

seven decades of experience in providing expert cooling solutions. It has offices across India, UAE,

Malaysia, Qatar and Oman, 5 modern manufacturing facilities, around 2500 employees and a turnover

of over USD $530 million. Alliances and partnerships with leaders in global technology have further

enhanced Blue Star’s capability in providing advanced cooling solutions for diverse needs.

Blue Star offers a range of air conditioning products that encompasses Screw Chillers, Scroll Chillers,

Air Handling Units, Fan Coil Units, Packaged Air Conditioners, Ducted Splits and VRF Systems apart

from room air conditioners such as Split, Window, Verticool and Cassette Air Conditioners. Refrigeration

products include Water Coolers, Deep Freezers and Water Cooling solutions specifically designed

to cater to the unique requirements of India, Middle East, Africa, SAARC, ASEAN and Pacific Islands

markets.

A wide range of models is available in each product category to ensure that the air conditioning

system design is implemented without any compromise. All the products are energy efficient and

come with a host of distinctive features. Every Blue Star product is a result of robust R&D, a strong

understanding of design and superior manufacturing processes. These core attributes have made

Blue Star the preferred cooling solution provider.

Blue Star’s international business consists of AC&R product exports to the Middle East, Africa, SAARC,

ASEAN and Pacific Islands regions, with steady progress also being made in developing the other

international markets. In addition, the Company also participates in international projects managed

by the Company’s joint ventures in Qatar, Oman and Malaysia.

New opportunities are being identified for AC&R products, MEP projects, after-sales service as well

as system integration and agency businesses in global markets.

Global Presence

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World-class Testing Facilities

Blue Star’s infrastructure for conducting various performance tests on new products is one of the

largest in India, ensuring that every product and technology is tested vigorously before being

productionised. Blue Star has 6 Psychrometric, 2 Condensing and 2 Environmental test labs.

Blue Star’s R&D labs at Thane and Dadra have been certified by Intertek, Sweden to carry out safety

tests for HVAC products as per the International Electrotechnical Commission Standards. Intertek is

a global leader in safety testing and certification for regulatory approval.

Also, the National Accreditation Board for Testing and Calibration Laboratories (NABL) has conferred

a Certificate of Accreditation to Blue Star Laboratories located at Thane and Wada, India in accordance

with the Standard ISO 17025: 2005.

NABL is a signatory member of APLAC and International Laboratory Accreditation Cooperation (ILAC).

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Products designed are also subject to various reliability tests before they are cleared for manufacturing.

These include endurance, vibration and shock tests along with life cycle and ageing tests to

rigorously test design reliability.

All Blue Star products are designed to perform under tropical conditions such as high ambients,

high humidity, extreme voltage conditions and fluctuations.

Wada, Maharashtra Dadra

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Advanced Psychrometric Test LabBlue Star factories have a modern Psychrometric Test Lab that can simulate and test products under

various conditions. All machines manufactured at our factories are rigorously tested for various

parameters before dispatch. Customers too can witness actual performance tests conducted on the

products before dispatch of their machines, making Blue Star one of the few companies in the air

conditioning industry offering this facility.

World-class ManufacturingBlue Star’s manufacturing strength is spread across five state-of-the-art manufacturing facilities.

Blue Star’s commercial and residential AC units are manufactured at the modern factories at Wada,

Dadra and Himachal Pradesh. Set up to international standards, the products manufactured at

these ISO 9001-2008 certified factories are exported to various countries across the globe.

The factories are highly productive, automated and flexible. They are also efficient in manufacturing

the setup of heat exchange coils and advanced chillers. In addition, these factories have modern

sheet metal fabrication units with Amada punching and bending machines.

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Blue Star’s production facilities use raw materials that are of the highest quality, including corrosion

resistant, galvanised steel for enhanced life and rust protection. The equipment used to process

the steel includes CNC machines such as the Amada punch press, hydraulic press, specialised

microprocessor-based protection and resistance welders. All these machines ensure superior

quality in cabinet fabrication to tight tolerances.

All products are powder coated by specialised process equipment from Nordson of the USA on

fully conveyorised lines. They are fitted with electro-mechanical oscillators that ensure an even

powder coating. A ‘smart spray’ mechanism senses movement of the conveyor and geometry of

the component to adjust the powder flow.

Blue Star is equipped with a high-tech coil manufacturing setup using imported Burr Oak machines

that can manufacture high-efficiency plain coils as well as enhanced split fins for superior heat

transfer.

The copper tubes are then processed by a bank of PLC-controlled Burr Oak machines that ensure

perfect bonding between the copper tubes and fins for superior performance. The coils are then

tested for fine leaks with ultra-sensitive electronic leak detectors to enhance reliability.

The entire AHU range is manufactured with robust manufacturing practices and quality processes

laid down by Blue Star. And is subject to QC testing at the factory for all critical parameters such as

CFM and static pressure, casing leak, current, voltage and vibration.

Ensuring an excellent finish

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Blue Star’s production processes and QC have resulted in

international recognition of the quality and reliability of

Blue Star products and their performance.

ISO 9001-2008 Quality Management Systems certification

Mechanical and Performance Characteristics BS/EN1886:2007 for strength of casing, tightness,

thermal resistance, thermal bridging and filter

bypass leakage for AHU.

EN13053 for air flow-static pressure performance, heat transfer

and heat recovery performance.

Sound Attenuators certified in SRL, UK for the static

insertion loss as per BS 4718-1971.

Test rig in accordance to AMCA 210-07 & AMCA 300-14 to

test the product performance.

Acoustic LabDesigners are often challenged to select and arrange the air handling components so that the inlet,

discharge and casing-radiated, fan-generated sound and power levels help create a quiet space. To

accomplish this, attenuation is necessary, which is qualified by an Acoustic Lab.

Certified for Excellence

The air handling unit (AHU) is one of the most essential and critical components to be considered

when designing an air conditioning system.

The importance of the air handling unit in the system is readily understood, as it modifies the air

conditions for environments and is placed at the downstream of all other installed equipments.

Both the construction layout and the physical sizes of the installed air handling unit being critical

means that it is extremely difficult to adjust at a later date to situations different from those

established during the original selection process. For this reason, the equipment must be carefully

and precisely selected.

The width and height of the equipment is defined on the basis of the air flow rate.

The type of fan and the motor can be selected on the basis of the designed static pressure. The

characteristics of the cooling and heating units can be defined on the basis of the estimated cooling

and/or heating load.

Various additional sections can be added to obtain an apparatus defined by three dimensions and

with a series of specific components.

Blue Star’s World-class AHUs

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The DIDW type forward / backward curved / aerofoil centrifugal fans / EC fans or plug fans to

be selected for use in low, medium or high-pressure air systems, depending on the project

characteristics.

Several options are also available for heat exchangers.

The most commonly used cooling media are:

Chilled water, Glycol water, Direct expansion of coolants etc.

The heating units installed can use different heating fluids such as:

Hot water, Superheated water, Steam, Electricity etc.

An extensive range of air filters can handle a variety of filtering needs, from simple impurity filtering

to absolute filtering, within the limits established by the manufacturer for the filtering media.

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Two different types of air humidifiers can be installed in air handling units. In both cases, the units are adiabatic

humidifiers.

A set of many well-differentiated sections complete the assembly to allow the intake of outside air, mix it with

returned air, filter it, heat it, cool it, humidify it, recover heat, provide access to the equipment interior etc.

Once completed, the air handling unit features a smooth, exterior line with a solid, sturdy, aesthetically pleasing

look that fits with the surroundings.

That is why Blue Star’s product range includes a very wide array of high-quality, world-class double skinned

AHUs. The range ensures that there is a right fit for every application whether it is for ...

COMFORT SOLUTIONS

Simple project implementation for expansion of existing premises or new buildings. Simplifies selection and

planning and includes smart solutions for easier installation.

COMPACT SOLUTIONS

Extreme space-saving solutions and new connections for units that can also be split. Completely adaptable to

satisfy all new demands. Compact air handling units are easier to transport and handle at the construction site.

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FLEXIBLE SOLUTIONSFlexible solutions with heat recovery and intelligent control functions that are easily adapted to suit

current needs of different recovery systems and configurations.

INDUSTRIAL SOLUTIONSAir humidifiers can be installed in air handling units, which makes it suitable for air cooling, water spray

humidifier and scrubber applications.

CLEAN ROOM SOLUTIONSClean rooms can encompass numerous applications, everything from operating theatres to laboratories.

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Blue Star offers a wide and comprehensive range of AHUs that spans capacities extending from a

modest 1700 to over 178,000 CMH.

Blue Star’s AHUs come in a variety of forms to suit any installation, ensuring freedom and flexibility

in design. The range includes customised floor-mounted AHUs that are compliant with Eurovent

certification or Non-Eurovent certification, and are standard horizontal and vertical floor-mounted

as well as ceiling-suspended AHUs.

The Blue Star AHU Range

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HorizontalFloor Mounted

1700 ~ 71400 m3 / hr(1000 ~ 42000 cfm)

3400 ~ 13600 m3 / hr(2000 ~ 8000 cfm)

2040 ~ 17000 m3 / hr(1200 ~ 10000 cfm)

3500 ~ 7000 m3 / hr(2000 ~ 4000 cfm)

Belt Driven Direct Driven

HorizontalFloor Mounted Ceiling Suspended Customized

EuroventCustomized

Non Eurovent

Double SkinAir Handling Unit

NDSA Standard Units

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Dimensional Verification Dimensional verificationPhysical dimensions are verified against GA drawings so that the finished unit matches space

requirements at the site.

Static Pressure and Air QuantityThe AHU is run with a duct connected to simulate static pressure for half an hour, and CFM is measured at return air side with the help of a velocity matrix or in the supply air duct using a pitot tube. Static pressure is also measured using a manometer.

Noise and Vibration LevelsThe AHU runs for half an hour after which noise levels are measured 1m away from the AHU casing on all four sides using a dB meter. A vibration meter is also used to measure vibration.

Voltage, Current and WattageWhile the AHU runs the voltage, current and wattage readings are noted using a digital meter.

Fan/Motor RPMThe AHU runs for half an hour after which a contactless tachometer is used to measure fan and motor RPMs.

Fan Bearing TemperatureFan bearing temperature is noted using an infrared temperature gun.

Coil LeaksCompressed air is charged into the brazed water-cooled coil up to a pressure of 325psig (450psig for Dx type coils) and the coil is then dipped into a water tank for a while to check for leaks.

The above tests ensure that the units that leave the Blue Star factory are ready for a rugged performance in the field. Customers can even witness their AHUs undergoing the tests before being shipped to the site.

Tested for Performance

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The Key Components in Blue Star AHUs

Features of AHU Casing

• The metal enclosure that covers all the components contained in the Air Handling Unit is sturdy and has no protruding items to disturb the overall look of the unit.

• Air handling units have a frame composed of an extruded aluminium section that outlines the equipment edges perfectly, resulting in a solid, robust and attractive overall look. These aluminium extruded sections are joined by injection-moulded glass-reinforced plastic angle cleats. In larger sizes, the sections are joined together by angle cleats made from engineering plastics. The assembly is anchored by slot screws, obtaining a solid, sturdy structure.

• The unit enclosure is made up of sandwich panels comprising two pieces of galvanised sheets one inside the other.

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• The inner rack is made of aluzinc or galvanised steel sheet, whereas the exterior rack of the same

material has precoated/aluzinc finish. The insulation material between the two racks is either

machine injected polyurethane foam insulation or rockwool/glasswool to ensure excellent thermal

and sound insulation and potential condensation.

• The polyurethane foam injection process is carried out by introducing a press with hot plates

which promotes polymerisation and avoids panel deformation due to the expansive strength of

the chemicals.

• This method results in a higher mechanical stiffness than panels filled with other types of insulation

(even when the panels have thicker sheets) as the adhesion of the chemical foam to the metal sheet

significantly increases the mechanical strength.

Polyurethane foam insulation has become extremely popular. It was introduced many years ago

for the insulation of air handling units. Even rockwool/glasswool can be used according to the

requirement.

The AHU panels are manufactured in nominal thicknesses of 25mm and 50mm and are mounted

on a frame composed of an aluminium profile which outlines the equipment edges precisely.

Regardless of the type of structure, all panels on the access side can be easily dismounted, thereby

facilitating access to the internal parts of the air handling unit by the maintenance staff.

The finished equipment can have a bedplate composed of channel sections or feet. Based on the

project needs, it can also be set on shock absorbers when vibration must be avoided.

The enclosure described contains all the air handling unit sections, which can include some or all of

the ones described below:

Inlet SectionThis section is composed of a standardised length with an air inlet to the air handling unit.

This opening can:

Use a volume control damper that can be equipped for manual operation or for subsequent

automation.

Be protected by an air shutter.

The combination of the previous two.

Be equipped with a simple inlet consisting of a straight flange for easier duct connection;

In addition, a cover to prevent water from entering when

the equipment is placed outdoors can be provided.

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Mixing Section

This has similar features as the above and two openings, each of which contain a control damper. These dampers can be supplied with an extruded aluminium section construction and come with aluminium airfoil blades.

The operating mechanisms for all dampers are installed in the channel frame. This allows air to circulate freely and facilitates installation in closed ducts. The mechanisms and fasteners are made of corrosion resistant materials.

The operating mechanism of the dampers may be manual or equipped for motor-driven operation. In the latter case, upon request and depending on the damper size, these controls can be supplied and interconnected so that they can be operated by a single servo drive.

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Free Cooling Section

This section requires a return fan and a supply fan. These fans must have three dampers in between to regulate the volumes of exhaust, return and outside air.

In order to meet their purpose the dampers must be motor-driven.

When the enthalpy of the outside air is less than the enthalpy of the recirculated air i.e., during spring and autumn, the mixture of outside air and recirculated air is controlled to achieve free cooling.

Consequently, the relative opening of the dampers is determined by an enthalpy (or dry temperature) comparator, which sends the respective signal to the damper motors.

In order to ensure the minimum ventilation air required in cooling or heating seasons, the outside air inlet damper can be split into two sections (one motor-driven and another, manual, that remains fixed). The cross-section of the damper will be proportional to the minimum ventilation air flow.

This effect can also be achieved more economically by adjusting the stroke of the motor operating the outside air damper so it does not close completely.

Blue Star AHUs come with a wide range of filters to suit any need. In general, all filters are of the

progressive density variety with a high dust-holding capacity, and ensure high indoor air quality.

The filters are designed to ensure low pressure drop across them thus reducing the load on the

system, resulting in lower power consumption.

Filters

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Air filtering is related to the quantity, variety and size of the suspended impurities, the existence of contaminant gases or odours and the desired filtering efficiency.

The various impurities that can exist in the air are discussed below.

The air contains numerous foreign substances caused by natural processes (e.g., wind erosion, sea evaporation, soil movements, volcanic eruptions) and by human activity (e.g., combustion).

Atmospheric dust is a mixture of fog, combustion gases, fine dry particles and fibres. Air testing normally indicates the presence of soot and smoke, quartz, soil, residue from decomposed animals and vegetables, organic substances in the form of cotton and plant fibres, and metal fragments. The air also contains other organisms such as microorganisms, spores and pollen.

Particle size is expressed in microns (10-6 m). Air contains particles with a thickness of up to 0.01 microns and other particles with a thickness similar to fibres, leaves etc.

Dust is generally understood as particles under 100 microns.

The particle size distribution of particles in atmospheric dust can be measured in one of several ways. The following figure contains three curves representing the distribution of particles according to number, weight or spray surface.

The upper curve indicates (in % of total) the number of suspended particles in the air with a diameter below a certain reference number (e.g., 99.9% are below 1 micron).

The middle curve shows the particle spray distribution on the surface; for example, the surface sprayed with particles under 1 micron account for 30% of the total weight of the particles.

The lower curve indicates the distribution by weight of atmospheric dust; for example, particles below 1 micron account for 30% of the total weight of the particles.

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Traditionally, a variety of measurement methods have been used to determine the efficiency of the

different types of filters and no classification system combining the various criteria in use existed.

The first version of the Unified Standard EN 779 was issued to unify the classification criteria for all

filters with an initial efficiency with atmospheric dust less than or equal to 98%, (Group G: coarse

dust filters; Group F: fine dust filters).

Later, in 1998, the first version of Unified Standard EN-1822 unifying the classification criteria for

HEPA and ULPA absolute filters was published. The initial efficiency of these filters with atmospheric

dust is greater than 98%.

The standardised range for the EDSA Air Handling Unit includes three air filtering sections which,

combined with the wide variety of filtering materials, cover an extensive range of possibilities in

filtering efficiency.

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The filters correspond to Classes G1, G2, G3 and G4 of Group G (coarse dust filters) and Class F5, F6

and F7 for Group F (fine dust filters), as per UNE-EN 779.

Extended Surface Filters

Characterised by a specific type of pleat which produces a larger filtering surface, the pleat design,

as well as the alignment between the pleats, ensure uniform air circulation over the surface of the

filtering media.

The extended surface filter is composed of a frame, filtering media in a zigzag layout and an

electrowelded mesh to hold the media. Its advantages with respect to flat filters are:

Greater filtering surface

Reduced front air velocity

Greater efficiency

Greater dust retention capacity

Reduced front surface

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These allow a high filtering flow rate in relation to the front surface area and are constructed with

fibreglass (greater efficiency) or synthetic fibre (lower efficiency) filtering media.

This equipment has the following advantages:

Lower power requirement

Longer filter renewal interval

Lower energy costs

Lower maintenance

Flexible bag filters have a medium to high efficiency and correspond to Classes F5, F6, F7 and F8 of

Group F (fine dust filters) as per UNE-EN 779.

Flexible Bag Filters

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Likewise, both rigid bag filters and flexible bag filters of Class F8 and F9 trap particles below 6

microns, which correspond to the smallest particles of those in temporary suspension that are

visible under a microscopic.

Rigid Bag Filters

Rigid bag filters allow a high filtering flow in relation to the front surface area and have thefollowing advantages:

Solid, sturdy construction for fast,

easy installation.

Compact, reduced-volume design. These

filters have a medium to high efficiency and

correspond to Classes F5, F6, F7, F8 and F9 of

Group F (fine dust filters) as per UNE-EN 779.

Both the rigid and the flexible bag filters are specially recommended for:

Hospitals

Pharmaceutical companies

Food industries

Computer rooms

Office buildings

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Absolute Hepa filters

They should be installed immediately before the space requiring this virtually sterile air that these

filters can supply.

They correspond to Classes H10, H11, H12, H13 and H14 of Group H: absolute filter, HEPA and ULPA,

as per UNEEN 1822.

Absolute Filters

These filters require careful installation that guarantees complete air-tightness of all gaskets. They

are designed to eliminate virtually even the smallest particles in the air i.e., those in continuous

suspension (the smallest of these are only visible using electronic microscopes).

They are specially recommended for:

Hospitals

Food industries

Pharmaceutical companies

Clean rooms

Absolute filtering of air in environments with controlled contamination

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The cooling and heating units are composed in an enclosure which contains the tube and fin heat

transfer unit mounted on a special joint cover.

For air cooling processes, units composed of copper pipes and aluminium fins (Cu/Al) are normally

used.

At the bottom, the cooling section has an aluminium/stainless steel pan for collecting condensation

and a small hose to drain the condensation towards the outside.

The pan is slightly tilted for easier drainage, in order to prevent the proliferation of harmful bacteria such as Legionella pneumophila.

Cooling/Heating Section

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Direct expansion units are also used for cooling. These units can be equipped with one or two manifolds.

For heating processes, the same type of copper/aluminium units used for cooling are normally used.

If the air contains corrosive chemicals, copper tube and fin (Cu/Cu) units should be used to improve the corrosion resistance of the equipment. This type of unit is more expensive than the copper/aluminium unit.

This class of heating/cooling unit is most commonly installed in air handling units and is composed of a coil of copper pipes covered with thin aluminium fins to greatly increase the primary heat transfer surface of the tube, due to the large transfer surface of the fins. The front air velocity surface (Afo) expressed in m2 is determined by the dimensions (width x height) of the air handling unit internally.

The maximum horizontal length of the finned coil is determined by the working width of the interior of the air handling unit and expressed in mm.

The depth of the heating/cooling unit is composed of a specific number of rows of tubes facing the direction of air flow. The number of rows is calculated according to the air flow conditions at the inlet and outlet of the unit, based on the cooling or heating energy used by the equipment.

The standardised Air Handling Unit range uses the following heating/cooling units:This range can be used with any cooling or heating fluid except steam, where the length of the finned coil is slightly lower, and since collectors must be mounted on both sides of the unit instead of one side only, as normally done with other fluids.

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Normally, the air velocity through the heating/cooling unit should not exceed 2.7 m/s (not including

the drop separator), as this velocity is considered the maximum admissible to prevent entrainment

of condensed water to other sections of the air handling unit or from the air supply system to the

environments.

The heating/cooling unit will also provide good efficiency levels at lower velocities As a result, since

the pressure drop of the air flowing through the unit is lower, both the static pressure of the fan and

the input power are also lower.

In terms of energy, this factor can save on power consumption over the years. Moreover, when the

fan is selected, the rotating speed of the fan can be lowered to reduce the noise level.

In some cases, the above factors are critical and can be solved by selecting an air velocity through

the heating/cooling unit below 2.7 m/s. In the case of air handling units with heating units only

(one or more), the air velocity may be above 2.7 m/s, although in terms of energy consumption and

the above considerations, the circumstances are the same. Generally, the flow velocity is 3.5 m/s.

For heating, the use of units with steel pipes is recommended when utilising fluids at high

temperature and pressure, as these pipes are much stronger than copper pipes, which could get

deformed under these conditions due to excessive expansion of the metal.

Selection of the air velocity through the heating/cooling unit

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We can analyse the use of a germicide section to improve the quality of the air supply only upon request.

An adequately designed germicide section should ensure that all bacteria flowing through the system are subjected to the bactericidal radiation necessary for its disposal.

The emitters should be installed in areas prone to bacterial growth, such as cooling units, drip pans and other moist areas, in other words, in any parts that have adequate conditions for bacteria development.

The use of this equipment will improve the air quality of the treated environments, as well as the heat exchanger efficiency of the units, minimising the need for cleaning and maintenance of the units and the drip pan.

If the specified exposure times are used, these emitters can attack microbes on surfaces or suspended in the air that are growing, circulating or being distributed in the air handling units, and which are largely responsible for allergies and other air-borne diseases.

Germicide Section

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This section, which has a hinged access door and is equipped with an enclosure and handle, is

sandwiched in the air handling unit configuration to allow access to the lower parts that require

surveillance or regular maintenance.

It may also be used to hold any type of auxiliary component, such as a perforated jet humidifier for direct humidification with steam, or other types of components.

Access Section

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Two different types of air humidifiers can be installed in Blue Star’s air handling units. In both cases,

the units are adiabatic humidifiers.

Panel humidifier, composed of a standardised enclosure, including a stainless steel drip pan at the

bottom.

The enclosure houses the humidifier panel which has crosswise corrugated channels to ensure

minimum air resistance as well as a large contact surface between the air and water, thereby

releasing moisture into the circulating air.

The top of the panel contains a water manifold, to which the water is pumped through the

pipework from the drip pan by means of a small submersible electrical pump. Water is distributed

vertically downwards by gravity, coating the entire inner panel surface with an extremely fine film.

As the air flows by the panel horizontally through the spaces provided, turbulent flow conditions

are established, thereby resulting in efficient transfer of heat and moisture.

The humidifier panel is made of two different types of material:

• Fibreglass - Mixed with structural additives for stiffening, fibreglass is the material we recommend

for the construction of equipment with materials accepted by current regulations, as it helps

prevent the growth of Legionella.

• Cellulose - With chemical additives, it can absorb water and its stiffness won't be affected.

Humidifier Section

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The air scrubber is composed of an enclosure with a large drip pan at the bottom. The tray contains

enough water to create steady state conditions in the scrubber system and is equipped with hoses

to connect the circulating pump (supplied when requested by the client) and water supply, drain

and overflow fittings.

The water travels through a distribution branch with spray nozzles. Two distribution branches may

be used to increase the efficiency of the humidifier. A drop separator with blades designed to hold

drops in the air is installed on the air outlet side, ensuring that no drops are carried to other sections.

In order to prevent leaks of water, the entire section is watertight and has an access door equipped

with a sight-hole for visual inspection. This type of air scrubber can be made entirely of reinforced

polyester (both the enclosure and the drip pan) to prevent corrosion. The equipment that includes

the air scrubber comes with a bed-plate composed of steel channel sections which are used to

support the entire air handling unit.

The air scrubbers are installed exclusively by special order, as they are not included in the

standardised range.

Air Washer

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ES = 38 – 24

x 100 = 82.3%

38 – 21

ES = Tse – Tss

x 100 Tse – Th

In order to calculate the humidifier’s efficiency, use the following formula to determine the

saturation efficiency (SE):

Where:

Tse = dry temperature of inlet air.

Tss = dry temperature of outlet air.

Th = wet-bulb temperature of air.

Based on the psychrometric chart (a diagram is shown on this page),

air with inlet conditions of 38º C (Tse) and 21º C (Th) is converted in the humidifier finding the

process at the wet-bulb line of 21º C until reaching an outlet temperature of 24º C (Tss).

The saturation efficiency will be:

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200

( 29° C – 24° C) x 0,3 =

133.333 m3/h

The percentage of 82.3 is reasonable, since the maximum level that can be expected from this type of

humidifier is

90%, as shown in actual practice.

When this example is applied to a specific case in which an air flow of 30000 m3/h is circulating and the

moisture content of the air at the inlet (xe) is 8.6 g/kg and at the output (xs) is 14.4 g/kg, then the amount of

moisture added is:

Air Cooler Application

The above example shows that this type of panel may be used as a cooling medium, since its behaviour is

typical of adiabatic cooling or constant enthalpy process. Based on the above data, when heat dissipation

of 200,000, kcal/h is needed in a space where the inside temperature should be maintained at no more than

29ºC, it is possible to calculate the air flow that should be introduced and therefore, also removed from the

local. The air flow required will be:

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The same considerations used for the panel humidifier are applicable in the case of water spray

humidifiers, also known as air scrubbers. This is an air handling unit section which houses a series of

water sprays which produce very small particles that come into contact with the circulating air flow and

produce a high level of evaporation. The bottom of this section contains a drip pan from which water is

sent back to the sprays, with only evaporated water added back to the system. The system requires the

use of a water circulation motor pump which is not normally included in the supply of this section. A

price quote may be provided, however, upon request. To prevent the entrainment of water particles, this

type of humidifier is always equipped with a drip separator at the air outlet as a safety measure. The most

appropriate air velocity in this type of humidifier is 2.7 m/s, and the water flow circulated by the spray

bank is 0.8 l per m3/h of air. Water spraying can be done either in the same or the opposite direction of

air flow, resulting in different saturation efficiencies.

The use of multiple units also increases efficiency, with the following experimental results obtained:

• One unit only, same direction 60% efficiency; as air flow

• One unit only, opposite direction 75% efficiency; as air flow

• Dual unit, same direction as air flow 84% efficiency;

• Dual unit, one in same and one in opposite direction 90% efficiency;

• Dual unit, opposite direction to 95% efficiency air flow.

Sections with a dual unit are longer, and when spraying is opposite to the direction of air flow, a drip

separator is located at the inlet for the section. The examples indicated earlier for the panel humidifier,

are also useful for this type of humidifier. Selection of the most appropiate fan is mainly influenced by the

static pressure considered. Depending on the type of air conditioning system, different static pressures

are used (commonly known as low, medium or high). Low pressures are considered as those up to 90

mm w.g, medium pressure is up to 180 mm w.g. and high pressure is up to 300 mm w.g.

Water Spray Humidifier

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Whenever an application requires face velocity of air throw to be higher than recommended levels

due to extended reach or similar needs, and especially in coastal areas where the humidity is very

high, the cool air may carry fine droplets of water from the cooling coil along with it into the

occupied space.

To prevent the same and to ensure that only dry air enters the space, Blue Star AHUs can be supplied

with Drop Eliminators which remove such droplets from the air and allow only dry air into the room.

Drop Eliminators are provided with drain pans to collect the condensate water so removed from

the air, which is then drained away from the AHU.

Drop Eliminators

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This section is composed of a centrifugal fan with an anchor bed-plate, drive and electric motor or plug-fan.

The centrifugal fan motor assembly is mounted on Silentbloc bushings and the discharge outlet is joined to the opening in the enclosure by means of a flexible fire retardant synthetic seal.

This allows the unit to run without external transmission of the small vibrations normally caused by fan motor assemblies.

There are three types of fans that cover all needs: the forward and aerofoil models for low pressures and the backward for medium and high pressures.

Once the fan model is selected, check the respective behaviour curve to obtain the unique characteristics.

Based on two essential factors (air flow and total static pressure), the following is obtained:

• Revolutions per minute

• Efficiency in %

• Input power at the shaft in kW

• Mean sound power level of the octave bands in dB

• Air outlet velocity in m/s

• Dynamic pressure in mm w.g

• Peripheral velocity in m/s

Fan Section

Centrifugal

36

aerofoil backword

1,25 1,25 0.75

Poteje < 0.75

kW

1,20 1,15 kW ≤ Poteje < 10 kW

1,15 1,12 Poteje ≥ 10 kW

Forward curve fan Backward curve fan

In addition to the above, when the electric motor is selected, the input power at the shaft must be

multiplied by the following coefficients:

Coefficient to be used

Once the new value is obtained, compare it to the standardised values from the electric motor

manufacturers. The energy of the electric motor used to operate the fan is dissipated in the

circulating air, and therefore affects the cooling load of the cooling system.

In many cases, the air flow necessary for heating may be considerably less than for cooling. In this

case, a two speed motor can be used. This changes the fan characteristics, minimising air flow

during the winter season.

There are practically no limits for low-temperature operation in the fan section. In contrast, high

temperatures can damage the motor. These temperature limits are clearly defined by electric

motor manufacturers and must be respected at all times.

37

This plug fan built into an acoustically insulated air handling unit.

A plug fan supplies air at the fan section outlet with a low and even air speed. In certain situations it can, therefore, be an advantage to position air handling components on the outlet side of the fan.

A single inlet plug fan cones with an open outlet into the air handling unit. The fan impeller is fitted directly to the motor shaft. This fan type has low sound power levels in the lower frequencies and has an efficiency of up to 75%.

The motor is supplied with a 1-speed motor. In order to regulate the fan speed to its actual operating point, the motor must be fitted with a frequency converter.

The frequency converter can continuously control the fan speed and airflow. Power consumption can be greatly reduced by operating the fan at lower speed.

Operating temperatures:

Standard design: -10/+40 ˚C

Special design: -30/+60 ˚C.

All fans are fully balanced both statically and dynamically.

The fan and motor are built on a stable base frame that is connected to the unit casing with rubber vibration isolators. These are designed for high levels of vibration absorption.

The fan inlet is flexible and connected to the unit casing. This ensures good vibration absorption.

Plug Fan

EC Fan Plug Fan

38

TEFC Motors

The TEFC motors used in Blue Star AHUs are chosen for their reliability and long life. Standard

features include:

Voltage tolerance of +10%

Frequency tolerance of +5%

IP55 protection

Class F insulation

Class B temperature rise

Smooth operation up to a high 50oC ambient

For special applications, Blue Star AHUs can be fitted with TEFC motors that are fire-proof, and with

built-in thermistors for thermal protection. They also offer dual speed operation and are of the IEC

2 and 3 energy efficiency grade. They can also be VFD compatible in applications where VFDs are

used for the motors.

39

Silencer SectionThe baffles of the silencer section are made of natural galvanised steel sheet, with a peak at the

air inlet end to decrease the head loss. The baffles are also filled with a sound-insulating material

composed of fibreglass with an appropriate density. This material is also heat-resistant and its outer

face is protected against air erosion.

There are two options:

• PA: The sound insulation is protected against erosion due

to air flow by a flame-retardant protective layer. This is the

most common approach in ventilation and air

conditioning systems.

• PAM: Similar to PA, but with an additional

polyester film coating (Melinex). Used for applications

with acidic, alkaline or oily gases, as it can be

steam-cleaned. Recommended for hospitals, since bacterial

colony formation is not possible. These two models can be constructed with four lengths of baffle.

Special SectionsIn addition to the standardised sections, other special sections that meet specific requirements

can be analysed by special order and included in the air handling unit assembly designed for the

application requirement.

Recovery SectionRotating regenerative air-to-air recovery unit, specially designed to transfer sensitive (temperature) and latent (humidity) heat from the exhaust air to the supply air.

The supply air stops in one of the halves of the heat recovery unit, while the exhaust air circulates in counterflow through the other half.

When the impeller turns, the small air flowing channels comprising the impeller are alternately in contact with clean air and with return air, transmitting heat and moisture from one circuit to the other.

40

Static recovery unit: with air-to-air crossflow designed to transfer sensitive (temperature) heat. In

this type of heat recovery unit, the supply air is completely separate from the exhaust air, in order

to prevent any type of contamination from one air stream to the other.

Heat transfer takes place through the plate separating the two streams.

Two adjacent plates form a small duct for exhaust or supply air.

The plate-to-plate distance varies, depending on the size and efficiency requirements.

Recovery unit composed of a dual unit in a closed air-to-air circuit: This is designed to

transfer sensitive (temperature) heat, using units manufactured with copper pipes and aluminium

fins (Cu/Al).

The method is simple and economic, as the return air flows through one of the units, heating the

water that circulates inside and is then exhausted.

The outside air flows through the other unit which heats the air while it cools the circulating

water, with the latter heated again in the return circuit, creating a continuous sensitive-heat

recovery cycle in the air.

In order to ensure proper system operation in winter, facilities with an extremely low outside air

temperature must use glycol water.

Benefits achieved from the installation of any of these heat recovery systems:

• Reduced heating plant power, minimising equipment sizes in terms of boilers, fuel tank, circulating

pumps, heat pipes and heating units.

• Reduced cooling plant size (compressors and condensers or cooling towers), circulating pumps,

pipe grid and cooling units. Savings in operating power consumption for heat and cold generation.

Any of the recovery systems mentioned in this section can be installed upon request only, as they

are not included in the standardised range.

41

Energy Recovery VentilatorsBlue Star AHUs are highly energy-efficient due to various design features, one of which is the

inclusion of optional heat recovery tools in the system.

Heat recovery could be by way of:

Heat recovery wheel

Cross flow system

Counter flow system

Heat pipe system

In the heat recovery system, the relatively cooler return air is run alongside hot ambient outdoor air

that is being sucked in as fresh air before it is sent into the evaporator. The return air soaks in some

of the heat of the outdoor air, thereby sending in cooler air to the cooling coil. This reduces the load

on the cooling coil, thus reducing power consumption.

Counter Flow

Rotating Wheel Cross Flow

42

Features of the Heat Recovery Wheels used in Blue Star AHUs:

• Aluminium non-hygroscopic rotor offering up to 60% efficiency

• Hygroscopic rotor can offer higher efficiency up to 75%

• No condensation problems... so no defrosting needed

• Step-less speed control of belt driven thermal wheel motor

Dampers

Dampers are needed at various points in the AHU; the inlet, outlet, mixing section and the free

cooling area. Blue Star AHU Dampers are:

• Externally installed

• Fitted with maintenance-free synthetic bearings

• Suitable for motor or hand operation

• Available in aluminium or GI

A spigot arrangement can also be implemented for simple intake which can be covered to prevent

ingress of water.

43

Nomenclature

DCWS

D Double Skin

C Ceiling Suspended

W Water Cooled

S Standard Model

20 x 100 CMH

NOTES1 The details given above are for a set of conditions & are for guidence only.2 Each AHU is designed to meet specific requirement. Please contact local sales personnel for specific requirements.3 “Fan dia. & Overall dimensions are based on fan outlet velocity around 10.5 m/s because of height restrictions. These details on different fan outlet velocity are available on request.”4 Coils are selected @77DB/67WB Deg F air side temp & CHW In/Out 7&12 Deg C

Technical Specifications

Model No DCWS20 DCWS27 DCWS34 DCWS42 DCWS51 DCWS59 DCWS68

PerformanceParameters

Air Flow Volume (cmh) 2040 2720 3400 4250 5100 5950 6800

Air Flow Volume (cfm) 1200 1600 2000 2500 3000 3500 4000

Static Pressure (mm wg) 40 40 40 40 40 40 40

Coil Details

Coil Area (sq ft) 2.4 3.2 4 5 6 7 8

Face velocity (fpm) 500 500 500 500 500 500 500

Row Deep 6 6 6 6 6 6 6

Fin Height (mm) 413 476 508 572 445 508 540

Fin Length (mm) 540 624 732 813 1254 1281 1377

Tonnage Tr @ 6 Row Deep 2.2 3.6 4.9 6.7 10.9 11.4 13.2

Fan and MotorSpecifications

Velocity (m/s) 11.7 9.7 9.9 8.8 9.1 8.4 9.6

Model 7x7 9x9 10x10 12x12 9x9 10x10 10x10

Type (DIDW Belt Driven) Single Single Single Single Duplex Duplex Duplex

Motor (kW) 0.75 0.75 1.1 1.1 1.5 1.5 2.2

Filter Details

Area (sq ft) 3.8 4.6 5.8 6.9 8.0 9.4 9.8

Face Velocity (fpm) 318 347 346 361 373 374 409

Width (mm) 463 418 468 508 728 758 528

Height (mm) 378 513 573 633 513 573 573

Quantity (Nos) 2 2 2 2 2 2 3

Unit Dimension& Weight

Unit Width (mm) 820 900 1000 1080 1520 1600 1730

Unit Height (mm) 540 590 620 710 560 620 620

Unit Length (mm) 1150 950 975 1050 900 975 975

Operating Weight (kg) 130 140 170 200 220 250 270

Fan Sound Detail Fan Sound Level @ 1.8 mtr (dBA) 65 - 70 65 - 70 65 - 70 65 - 70 65 - 70 65 - 70 65 - 70

Ceiling Suspended Air Handling Unit

44

Model No DCWS76 DCWS85 DCWS102 DCWS119 DCWS136 DCWS153 DCWS170


Air Flow Volume (cmh) 7650 8500 10200 11900 13600 15300 17000

Air Flow Volume (cfm) 4500 5000 6000 7000 8000 9000 10000

Static Pressure (mm wg) 40 40 40 40 40 40 40

Coil Details

Coil Area (sq ft) 9 10 12 14 16 18 20

Face velocity (fpm) 500 500 500 500 500 500 500

Row Deep 6 6 6 6 6 6 6

Fin Height (mm) 540 603 603 699 699 762 794

Fin Length (mm) 1550 1541 1849 1863 2129 2195 2341

Tonnage Tr @ 6 Row Deep 15.1 16.8 20.7 23.9 27.9 31.3 35.0


Velocity (m/s) 7.9 8.8 10.5 8.7 9.9 8.0 8.9

Model 12x12 12x12 12x12 15x15 15x15 18x18 18x18

Type (DIDW Belt Driven) Duplex Duplex Duplex Duplex Duplex Duplex Duplex

Motor (kW) 2.2 2.2 3.7 3.7 3.7 5.5 5.5

Filter Details

Area (sq ft) 12.2 12.2 14.0 16.2 18.4 22.0 22.7

Face Velocity (fpm) 368 409 429 432 435 408 441

Width (mm) 598 598 684 684 583 608 638

Height (mm) 633 633 633 733 733 421 413

Quantity (Nos) 3 3 3 3 4 8 8


Unit Width (mm) 1730 1890 2215 2215 2500 2525 2610

Unit Height (mm) 700 700 700 785 785 915 915

Unit Length (mm) 1040 1040 1040 1120 1120 1235 1235

Operating Weight (kg) 310 330 370 430 470 570 600

Fan Sound Detail Fan Sound Level @ 1.8 mtr (dBA) 65 - 70 65 - 70 65 - 70 65 - 70 65 - 70 65 - 70 65 - 70

45

46

Floor Horizontal Air Handling Unit

Model No DHWS17 DHWS21 DHWS25 DHWS34 DHWS42 DHWS51 DHWS59 DHWS68 DHWS85 DHWS102 DHWS119 DHWS136 DHWS153


Air Flow Volume (cmh) 1700 2125 2550 3400 4250 5100 5950 6800 8500 10200 11900 13600 15300

Air Flow Volume (cfm) 1000 1250 1500 2000 2500 3000 3500 4000 5000 6000 7000 8000 9000

Static Pressure (mm wg) 50 50 50 50 50 50 50 50 50 50 50 50 50

Coil Details

Coil Area (sq ft) 2.0 2.5 3.0 4.1 5.1 6.1 7.1 8.1 10.2 12.2 14.2 16.3 18.3

Face velocity (fpm) 500 500 500 500 500 500 500 500 500 500 500 500 500

Row Deep 6 6 6 6 6 6 6 6 6 6 6 6 6

Fin Height (mm) 349 445 445 572 603 635 699 699 889 953 1016 1207 1207

Fin Length (mm) 541 531 637 661 783 892 946 1082 1062 1190 1301 1252 1409

Quantity (Nos) 1 1 1 1 1 1 1 1 1 1 1 1 1

Header Size OD (mm/inch) 20(7/8”) 20(7/8”) 32 (1 3/8”) 40(1 5/8”) 25(1 1/8”) 32(1 3/8”) 32(1 3/8”) 32(1 3/8”) 32(1 3/8”) 32(1 3/8”) 32(1 3/8”) 40(1 5/8”) 40(1 5/8”)

Tonnage Tr @ 6 Row Deep 6.05 12.97 16.21 21.8 22.96 34.25 34.74 41.34 51.42 63.54 75.56 85.67 98.66


Velocity (m/s) 9 11.3 8.5 9.1 9.1 8.7 10.1 9.2 11.5 8.7 10.2 9.3 10.4

Type (DIDW Belt Driven)Forward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

Curve

Fan Diameter (mm) 180 180 225 250 280 315 315 355 355 450 450 500 500

Motor (kW) 0.75 1.1 1.1 1.1 1.5 2.2 2.2 2.2 3.7 3.7 3.7 5.5 5.5

Filter Details

Area (sq ft) 2 2.5 3 4 5 6 7 8 10 12 14 16 18

Face Velocity (fpm) 500 413 500 500 500 500 500 500 413 500 500 500 453

Width (mm) 610 610 610 610 460 305 610 305 610 460 610 610 610 610 610 610 610 610 610 305

Height (mm) 305 460 460 610 610 610 610 610 610 610 610 610 305 610 305 610 460 610 610 610

Quantity (Nos) 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 4 4 2


Unit Width (mm) 874 915 958 1004 1128 1229 1281 1430 1430 1559 1625 1625 1765

Unit Height (mm) 673 825 825 975 975 975 990 990 1229 1229 1384 1534 1542

Unit Length (mm) 994 1008 1105 1161 1230 1304 1304 1397 1397 1607 1607 1718 1718

Operating Weight (kg) 131 153 169 198 230 262 277 310 366 435 476 569 603

Fan Sound Details Fan sound level @ 1.5mtr (dBA) 59.51 61.41 61.64 64.08 63.15 62.29 61.9 62.91 66.4 65.68 65.38 64.5 64.47

Model No DHWS170 DHWS187 DHWS204 DHWS221 DHWS238 DHWS255 DHWS272 DHWS289 DHWS306 DHWS323 DHWS340


Air Flow Volume (cmh) 17000 18700 20400 22100 23800 25500 27200 28900 30600 32300 34000

Air Flow Volume (cfm) 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000

Static Pressure (mm wg) 50 50 50 50 50 50 50 50 50 50 50

Coil Details

Coil Area (sq ft) 20.3 22.4 24.4 26.4 28.5 30.5 32.5 17.3 18.3 19.3 20.3

Face velocity (fpm) 500 500 500 500 500 500 500 500 500 500 500

Row Deep 6 6 6 6 6 6 6 6 6 6 6

Fin Height (mm) 1270 1270 1270 1207 1270 1461 1461 762 826 762 762

Fin Length (mm) 1487 1636 1785 2035 2082 1940 2069 2107 2059 2355 2479

Quantity (Nos) 1 1 1 1 1 1 1 2 2 2 2

Header Size OD (mm/inch) 40(1 5/8”) 40(1 5/8”) 50(2 1/8”) 65(2 5/8”) 65(2 5/8”) 65(2 5/8”) 65(2 5/8”) 65(2 5/8”) 65(2 5/8”) 65(2 5/8”) 65(2 5/8”)

Tonnage Tr @ 6 Row Deep 110.67 113 126.74 150.46 162.55 172.62 185.64 98.82 104.37 106 112.46


Velocity (m/s) 9.2 10.2 8.8 9.6 10.3 11 9.4 10 10.5 11 9.3


CurveForward Curve

Forward Curve

Forward Curve

Forward Curve

Forward Curve

Forward Curve

Forward CurveForward

CurveForward

CurveForward Curve

Fan Diameter (mm) 560 560 630 630 630 630 710 710 710 710 800

Motor (kW) 5.5 5.5 7.5 7.5 7.5 7.5 9.3 9.3 9.3 9.3 9.3

Filter Details

Area (sq ft) 20 22 24 26 28 30 32 34 36 38 40

Face Velocity (fpm) 500 500 500 472 500 500 500 500 500 472 500

Width (mm) 610 305 610 460 610 610 305 610 305 610 305 610 610 610 610 305 305 610 610 610 610 610

Height (mm) 610 610 610 610 610 610 610 610 610 610 610 610 460 610 305 610 305 610 610 305 610 305

Quantity (Nos) 4 2 4 2 6 6 2 6 2 6 3 6 3 6 3 2 1 9 8 4 8 4


Unit Width (mm) 1846 2000 2154 2405 2405 2259 2412 2412 2412 2710 2744

Unit Height (mm) 1542 1542 1542 1724 1724 1865 2020 1888 2175 1888 1888

Unit Length (mm) 1854 1904 2059 2059 2059 2059 2187 2187 2187 2187 2388

Operating Weight (kg) 664 703 793 865 882 902 1030 1032 1089 1107 1312

Fan Sound Details Fan sound level @ 1.5mtr (dBA) 65.11 65.02 65.31 65.56 65.8 66.18 65.53 65.63 65.91 66.23 68.05

46

Model No DHWS916 DHWS999 DHWS1166


Air Flow Volume (cmh) 91630 99960 116620

Air Flow Volume (cfm) 53900 58800 168600

Static Pressure (mm wg) 50 50 50

Coil Details

Coil Area (sq ft) 26.4 28.8 33.6

Face velocity (fpm) 500 500 500

Row Deep 6 6 6

Fin Height (mm) 953 1016 11143

Fin Length (mm) 2572 2633 2734

Quantity (Nos) 4 4 4

Header Size OD (mm/inch) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”)

Tonnage Tr @ 6 Row Deep 159.96 175 205


Velocity (m/s) 10 10.9 10.1


CurveForward Curve

Forward Curve

Fan Diameter (mm) 900 x 2 900 X 2 1000 X 2

Motor (kW) 15 x 2 15 x 2 18.5 X 2

Filter Details

Area (sq ft) 108 118 137

Face Velocity (fpm) 472 500 500

Width (mm) 610 610 610 610 305 305 610 460

Height (mm) 610 305 610 305 610 305 610 610

Quantity (Nos) 24 8 24 8 3 1 32 4


Unit Width (mm) 5644 5700 6000

Unit Height (mm) 2505 2505 2810

Unit Length (mm) 3008 3008 3210

Operating Weight (kg) 2619 2715 3149

Fan Sound Details Fan sound level @ 1.5mtr (dBA) 70.04 70.41 70.92

Model No DHWS374 DHWS408 DHWS425 DHWS476 DHWS510 DHWS544 DHWS612 DHWS646 DHWS680 DHWS714 DHWS816


Air Flow Volume (cmh) 37400 40800 42500 47600 51000 54400 61200 64600 68000 71400 81600

Air Flow Volume (cfm) 22000 24000 25000 28000 30000 32000 36000 38000 40000 42000 48000

Static Pressure (mm wg) 50 50 50 50 50 50 50 50 50 50 50

Coil Details

Coil Area (sq ft) 22.4 24.4 25.4 28.5 20.3 32.5 36.6 38.6 52.8 55.7 23.4

Face velocity (fpm) 500 500 500 500 500 500 500 500 500 500 500

Row Deep 6 6 6 6 6 6 6 6 6 6 6

Fin Height (mm) 889 953 1016 1080 762 1207 1270 1270 1270 1206.5 889

Fin Length (mm) 2337 2380 2324 2450 2479 2505 2677 2826 2975 1544 2450

Quantity (Nos) 2 2 2 2 2 2 2 2 2 4 4

Header Size OD (mm/inch) 65(2 5/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”) 80(3 1/8”)

Tonnage Tr @ 6 Row Deep 122.7 134 139.06 157.17 168.7 180.22 204.57 217.61 230.54 121.91 207.6


Velocity (m/s) 10.2 8.9 9.2 10.4 11.1 9.4 10.6 11.2 11.8 12.4 11.2


CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

CurveForward

Curve

Fan Diameter (mm) 800 900 900 900 900 1000 1000 1000 1000 1000 800 x 2

Motor (kW) 11 15 15 15 15 15 18.5 18.5 18.5 22 15 x 2

Filter Details

Area (sq ft) 44 48 50 56 60 64 72 76 80 84 96

Face Velocity (fpm) 500 500 453 500 500 500 500 500 500 472 500

Width (mm) 610 610 610 610 610 610 610 610 610 610 610 305 610 460 610 610 610 610

Height (mm) 610 460 610 610 305 610 305 610 305 610 610 610 610 610 610 305 610 610

Quantity (Nos) 8 4 12 12 4 12 4 12 4 16 16 4 16 4 20 20 4 24


Unit Width (mm) 2710 2770 2710 2822 2850 2822 3078 3232 3386 3685 5540

Unit Height (mm) 2080 2175 2505 2505 2660 2810 2810 2810 2810 2810 2170

Unit Length (mm) 2388 2658 2658 2658 2658 2910 2910 2910 2910 2910 2788

Operating Weight (kg) 1383 1606 1672 1743 1808 1930 2125 2188 2230 2290 2307

Fan Sound Details Fan sound level @ 1.5mtr (dBA) 68.33 70.14 70.07 70.2 70.49 70.81 71.09 71.38 71.85 72.29 68.85

Nomenclature

DHWS

D Double Skin

H Horizontal

W Water Cooled

S Standard Model

17 x 100 CMH

NOTES: The details given above are for a set of conditions & are for guidence only.1 We have selected the coil @77DB/67WB Deg F air side temp & CHW In/Out 7&12 Deg C2 Each AHU is designed to meet specific requirement. Please contact local sales personnel for specific requirements.3 Fan dia. & Overall dimensions are based on fan outlet velocity limitation of 11.2 m/s because of height restrictions. These details on different fan outlet velocity are available on request.

47

Floor Horizontal Air Handling Unit

48

Nomenclature

DHWS

D Double Skin

V Vertical

W Water Cooled

S Standard Model

17 x 100 CMH

Model No DVWS20 DVWS27 DVWS34 DVWS42 DVWS51 DVWS59 DVWS68 DVWS76 DVWS102

Performance Parameters

Air Flow Volume (cmh) 2040 2720 3400 4250 5100 5950 6800 7650 10200

Air Flow Volume (cfm) 1200 1600 2000 2500 3000 3500 4000 4500 6000

Static Pressure (mm wg) 40 40 40 40 40 40 40 40 40

Coil Details

Coil Area (sq ft) 2.4 3.2 4.0 5.0 6.0 7.0 8.0 9.0 12.0

Face Velocity (fpm) 500 500 500 500 500 500 500 500 500

Row Deep 6 6 6 6 6 6 6 6 6

Fin Height (mm) 318 445 445 508 445 508 508 572 572

Fin Length (mm) 703 669 836 915 1254 1281 1464 1464 1951

Tonnage Tr @ 6 Row Deep 2.9 3.7 5.4 7.2 9.5 11.3 13.1 14.8 19.9

Fan and Motor Details

Velocity (m/s) 7.3 9.7 9.9 8.8 9.1 8.6 9.9 7.9 10.5

Model 9X9 9X9 10X10 12X12 9X9 10X10 10X10 12X12/(250) 12X12

Type (DIDW Belt Driven) Single Single Single Single Duplex Duplex Duplex Duplex Duplex

Motor (kW) 0.75 0.75 1.1 1.1 1.5 1.5 2.2 2.2 3.7

Filter Details

Area (sq ft) 3.7 4.7 5.6 6.8 7.9 9.5 10.2 12.0 12.4


Width (mm) 453 435 518 558 484 519 554 441 455

Height (mm) 378 503 503 568 503 568 568 633 633

Quantity 2 2 2 2 3 3 3 4 4

Unit Dimension & Weight

Unit Width (mm) 970 935 1100 1180 1520 1625 1730 1835 1951

Unit Height (mm) 1135 1280 1310 1445 1260 1375 1375 1510 1510

Unit Length (mm) 610 610 665 740 610 665 665 740 740

Operating Weight (kg) 150 160 200 240 250 290 310 370 420

Fan Sound Details

Fan Sound Level @ 1.8MTR (dBA) 65-70 65-70 65-70 65-70 65-70 65-70 65-70 65-70 65-70

NOTES: The details given above are for a set of conditions & are for guidence only.1 We have selected the coil @77DB/67WB Deg F air side temp & CHW In/Out 7&12 Deg C2 Each AHU is designed to meet specific requirement. Please contact local sales personnel for specific requirements3 Fan dia. & Overall dimensions are based on fan outlet velocity limitation of 12.3 m/s because of height restrictions. These details on different fan outlet velocity are available on request.

Floor Vertical Air Handling Unit

49

50

Model No DVWS119 DVWS136 DVWS153 DVWS170 DVWS187 DVWS204 DVWS221 DVWS238 DVWS255

Performance Parameters

Air Flow Volume (cmh) 11900 13600 15300 17000 18700 20400 22100 23800 25500

Air Flow Volume (cfm) 7000 8000 9000 10000 11000 12000 13000 14000 15000

Static Pressure (mm wg) 40 40 40 40 40 40 40 40 40

Coil Details

Coil Area (sq ft) 14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 30.0


Row Deep 6 6 6 6 6 6 6 6 6

Fin Height (mm) 699 762 762 826 889 953 1080 1143 1143

Fin Length (mm) 1863 1951 2195 2252 2300 2342 2238 2277 2439

Tonnage Tr @ 6 Row Deep 23.5 26.6 31.1 34.5 38.1 41.5 44.9 48.5 52.1

Fan and Motor Details

Velocity (m/s) 12.3 9.9 8.0 8.9 9.7 10.6 9.5 10.2 10.9

Model 15X15 15X15 18X18 18X18 18X18 18X18 450 450 450

Type (DIDW Belt Driven) Duplex Duplex Duplex Duplex Duplex Duplex Duplex Duplex Duplex

Motor (kW) 3.7 3.7 3.7 5.5 5.5 5.5 7.5 7.5 7.5

Filter Details

Area (sq ft) 14.6 9.3 21.5 22.4 24.3 26.5 30.2 31.9 34.1


Width (mm) 536 536 620 615 619 630 615 615 656

Height (mm) 633 403 403 423 455 488 570 603 603

Quantity 4 4 8 8 8 8 8 8 8

Unit Dimension & Weight

Unit Width (mm) 2175 2215 2550 2550 2565 2610 2550 2550 2715

Unit Height (mm) 1710 1775 1900 1960 2025 2090 2250 2315 2315

Unit Length (mm) 830 830 975 975 975 975 1050 1050 1050

Operating Weight (kg) 510 540 660 690 730 770 800 830 870

Fan Sound Details

Fan Sound Level @ 1.8MTR (dBA) 65-70 65-70 65-70 65-70 65-70 65-70 65-70 65-70 65-70

Floor Vertical Air Handling Unit

50

Air Handling UnitsMakes every breath a high quality breath.

GPS

D/A

HU

/12,

2016

/1.2

k

Ss_42 x 29.7 CM_Ahu Low Design Elements Artwork_WS7_10642221__R4

air handling units makes every breath a high quality breath

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