Combi CoolerEnergy efficient cooling unit for air handling units

The unique, straightforward and energy efficient method of generating cooling capacity for a chilled beam system

ooling can be provided using chilled beams, fancoils or ceiling-mounted cassette chilled

beams. Because the Combi Cooler replaces other components, such as liquid coolers and external condensers, the unit takes up little space. The Combi Cooler is integrated into the air handling unit so all components are located in the plant room, avoiding outdoor or roof installation. Because the appear- ance of a building is not changed, renovation work is easier, and noisy condenser fans are not neces-sary.

Fläkt Woods’ patent pending Combi Cooler provides completely new opportunities when planning and specifying cooling systems. The Combi Cooler module can be integrated and mounted directly into the air handling unit. It is particularly suitable for use together with chilled beam systems.

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Systems using the Combi Cooler reduce energy consumption so that a cooling capacity of 100 kW is obtained with 21.5 kW instead of 35 kW.

limate change and energy consumption are our shared responsibility. For many years, product

development at Fläkt Woods has aimed at constantly improving energy efficiency and indoor air quality. Our e³ products and systems are a good example of our success.Because location and design have a major impact on a building’s energy consumption we have given architects and consultants a key to energy-efficient buildings. Overheating problems can be reduced considerably by ensuring that the building’s windows are protected from the sun. In business and office spaces, lighting, apparatus and people all represent a heat load. So for an even and comfortable room temperature of 21–24°C, the need for energy for cooling is greater than that for energy for heating. Supplementary cooling is necessary; and cooling can be achieved very economic-ally using the Combi Cooler.

1) The supply air to the air handling unit is only cooled to 18°C instead of the 15°C in traditional systems. This avoids energy-intensive condensation. Because the supply air temperature is slightly higher, areas such as empty meeting rooms with no heat load, maintain a comfort-able temperature, and unnecessary cooling is avoided. Electricity consumption is reduced by 14% (including the supplementary power used by the circuit for the chilled beams).

2) Vigorous subcooling of the refrigerant and a higher evaporation temperature reduce the energy required by 29%.

The Combi Cooler saves up to 40% energy

WHAT MAKES THE COMBI COOLER SO ENERGY EFFICIENT?C

The total energy saving is100 - (0,71 x 0,86) x 100 = 39 %

EQUAL COOLING CAPACITY WITH LESS ENERGY CONSUMPTIONIn practice, the annual energy required for cooling is halved when the supply air is cooled to 18°C instead of 15°C. While this does not reduce energy con-sumption, because the chilled beams must generate more cooling capacity, the higher supply air temper-ature prevents energy-intensive condensation.

THE RESULT OF NEW APPROACHES IN THE PLAN-NING AND SPECIFYING OF COOLING SYSTEMSThe supply air temperature is slightly higher than usual in the Combi Cooler, and most of the cooling capacity enters the room through chilled beams. In traditional solutions the supply air temperature is normally 15–16°C, while in solutions using the Com-bi Cooler it is 18°C. Using hotter supply air prevents air at too cold a temperature being carried into areas where there is no heat load, such as empty meeting rooms. At the same time, avoiding exces-sive cooling of the supply air prevents unwelcome and very energy-intensive condensation.

Cassette Chilled Beam

Chilled Beam

Combi Cooler

The Combi Cooler cools the supply air and produces cold water for room-based cooling

Air handling unit

AVOID OVERSIZING YOUR COOLING SYSTEM BY USING THE ACON AIR HANDLING SELECTION TOOLTaking the size of the room into account, it is easy to dimension the cooling capacity of a system using a Combi Cooler. Thanks to this the problem of oversiz-ing the cooling capacity can be avoided. Using the air handling selection tool ACON, a cooling system can be designed to provide excellent efficiency. Because maximum cooling capacity is only needed for 3–5% of the time the system is operating, it is important that the unit operates efficiently even when little cool-ing capacity is required. The Combi Cooler has three power stages, and the lower the power output, the greater the efficiency of the cooling unit.

Fancoil

Fitted liquid cooler

Heating and cooling coil integrated into the supply air

One module, integrated into the air handling unit

Optimised for use with chilled beam systems

Less installation work indoors and no installation work outdoors

Greater operating reliability because all components are designed and sized to work together

Easy commissioning as the unit is factory tested

Reduces the need for space in the plant room because the combi cooler only has one cooling coil

No liquid cooler to install in the plant room

The air conditioning unit is only marginally longer despite all the cooling equip-ment being built-in to it

No condensers on the roof to detract from the appearance of the building– The perfect solution when refurbishing old buildings

Energy efficient solution

THE MODERN SOLUTION FOR VENTILATION COOLING

If you have a small or medium cooling requirement, choose a Combi Cooler

Offices

Business premises

Small industrial units Shopping centres

0,5 1 2 4

EU-21

EU-22

EU-31

EU-32

EU-33

Combi Cooler unit sizes

123

123

123

123

123

m/s3

Flow chart

Refurbishment projects

Combi Cooler is suitable for buildings where the cooling need is max. 50 W/m2. This is often enough for offices and business premises.

154

C

A

B

1404

174

21 1104 1554 1548 648

22 1404 1854 1548 741

31 1404 1854 2148 1015

32 1704 2154 2148 1117

33 2004 2454 2148 1258

Unit size A B C Weight, kg

21 0.8–1.4 23 30 36

22 1.2–1.8 33 39 46

31 1.6–2.8 46 57 69

32 2.4–3.6 63 74 85

33 2.8–4.2 79 90 102

Cooling power kWOutput variant 1

Air flow range

Unit size

2 3

Technical data

*) Refrigerator R134a

Unitsize Circ. 1 Circ. 2

21 1 8.55.5

21 2 9.55.521 3 116.5

22 1 127

22 2 13.59

22 3 15.59

31 1 169.5

31 2 171031 3 17.510

32 1 19.511

32 2 19.511.532 3 2111.5

33 1 2212

33 2 22.513

33 3 2314

Refrigerant*Outputvariant

We Bring Air to Life

FläktWoods is a globalleader in air management.We specialise in the designand manufacture of a widerange of air climate and airmovement solutions. Andour collective experienceis unrivalled.

Our constant aim is toprovide systems thatprecisely deliver requiredfunction and performance,as well as maximise energy efficiency.

FläktWoods is providing solutions for ventilation and air climate for buildings as well as fan solutions for Industry and Infrastructure.

Solutions for all your air climate and air movement needs

Air Handling Units (AHUs)Modular, compact and smallAHU units. Designed to ensureoptimisation of indoor air quality,operational performance andservice life.

Air Terminal Devices and DuctsSupply and exhaust diffusers andvalves for installation on walls, ceilingor floor are all included in our largerange and fit all types of applications.

Chilled BeamsActive induction beams forventilation, cooling and heating,and passive convection beamsfor cooling. For suspended orflush-mounted ceiling installation –andmulti-service configuration.With unique Comfort Control andFlow Pattern Control features.

Residential ventilationA complete range of products forresidential ventilation. Consists ofventilation units, exhaust air fans andcooker hoods designed to optimiseindoor comfort and save energy.

FansAdvanced axial, centrifugal andboxed fans for general and specialistapplications. Comprehensive rangeincluding high temperature and ATEXcompliant options. Engineered forenergy efficiency andminimised lifecycle cost.

ChillersAir-cooled and water-cooled chillerswith cooling capacity up to 1800kW.Designed tominimise annual energyconsumption in all types of buildings.

Controls and drivesVariable speed drives and controlsystems, all tested to ensure totalcompatibility with our products.Specialist teamcan advise on energysaving and overall systemintegration.

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Fläkt Woods Group SA18, avenue Louis Casaï, CH-1209 Geneva, SwitzerlandTel. +41 22 309 3800email info@flaktwoods.com www.flaktwoods.com

See global web site for internationalsales offices www.flaktwoods.com