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8/8/2019 Building Envelope Latest

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SCHOOL OF PLANNING AND ARCHITECTURE, M. B.E.M

TUSHAR KUMAR , SMRITI MOHTA , R PRASANNA VENKATESAN , SANKALP SEN SAXENA, SOUMYA BATCH 2010-2012E.S.I HOSPITAL, Sector -24, Noida

SCHOOL OF PLANNING AND ARCHITECTURE,

M. B.E.MR PRASANNA VENKATESAN

SMRITI MOHTA

SANKALP SEN SAXENA

SOUMYA

TUSHAR KUMAR

BATCH 2010 - 2012

E.S.I HOSPITAL,

Sector -24, Noida


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The "Building Envelope" is the area that separates conditioned space from

unconditioned space or the outdoors. It is the separation between the

interior and the exterior environments of a building. It serves as the outer

shell to protect the indoor environment as well as to facilitate its climate

control.

BUILDING ENVELOPE!!!!!..................................

Building envelope design includes fourmajor performance objectives:

STRUCTURAL INTEGRITY

MOISTURE CONTROL

TEMPERATURE CONTROL

CONTROL OF AIR PRESSURE

BOUNDARIES OF SORTS


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E.S.I Multi - Specialty Hospital, Sector - 24, Noida

The proposed expansion of the existing hospital complex is a Govt. project

developed under the Employees State Insurance Corporation ( E.S.I.C. )

Scheme at Plot No. A 3, Sector 24, Noida, Uttar Pradesh.

N

The PROJECT


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THE EXISTING BUILDING ENVELOPE

All the external walls of the building are 230mm thick brick masonrywalls.

Building Envelope

On top of the masonry walls

there is A.C.P cladding on all

sides of the building.

This A.C.P cladding is very

beneficial in preventing the

building from getting too hot as

A.C.P panels reflect most of the

solar radiation and allow

transmission of only a fraction

of it inside the building.


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PHOTO 1 (CLOSER VIEW)

PHOTO 1

PHOTO

2

PHOTO 1 PHOTO 1 (CLOSER VIEW)

PHOTO 2 PHOTO 3

PHOTO 4

PHOTO

3

PHOTO 4

These photographs

demonstrate the height

differences within the

building block and also

the other building blocks

on site.


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Building Envelope

ENERGY SAVING POTENTIAL

Heating, cooling and lighting systems have the major impact on the energy consumption in non-

residential buildings. This energy demand is due to perform thermal and visual comfort in the indoor

environment. The Envelope System strongly affect the energy demand of these active systems, since

it regulates heating and cooling loads and daylight availability. With the help of Building Envelope

renovations and refurbishment major energy savings can be achieved reducing thermal and electric

loads.

METHODS OF ENERGY SAVING

From the energy efficiency point of view, the envelope design must take into consideration both the

external and internal heat loads , as well as daylighting benefits. External loads include mainly solar

gains through windows, heat losses across the envelope surfaces and unwanted air infiltration in

the building. On the other hand the internal heat loads include heat released by the electrical lighting

systems, equipment, and people working in the building space. One of the goals of the envelope

design should be to introduce day-lighting into the interior space of the building through windows

and skylights, thereby reducing the need for artificial lighting. Proper sizing of the windows will help

in introducing the required daylight and reduce the need for artificial lighting.


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Building Envelope

METHODS OF ENERGY SAVING

Secondly, to maintain thermal comfort and minimize internal cooling/heating loads, the building

envelop needs to regulate and optimize heat transfer through roof, walls, windows, doors, and other

openings. Effective insulation of roof and walls, appropriate selection of glazing and framing for

windows, and suitable shading strategy are important in designing energy efficient buildings.


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Autoclaved Aerated Concrete (AAC) is effectively concrete with lots of closed air pockets in it. It

is lightweight and energy efficient, and is manufactured by the process of mixing Fly Ash, Quick

Lime, Cement and Gypsum along with water in a high speed mixer to form a slurry, a small

amount of foaming agent is added and mixed, and poured into moulds, then are wire cut into

blocks or panels from the resulting cake, and cooked with steam (autoclaving).

Autoclaved Aerated Concrete

AAC has moderate embodied energy content

and performs very well as thermal and sound

insulation, due to the aerated structure of the

material and the unique combination of thermal

insulation and thermal mass properties. AAC is

light, does not burn, is an excellent fire barrier,

and is able to support quite large loads. It is

relatively easy to work with and can be cut and

shaped with hand tools.

Blocks are made to very exacting dimensions and are usually laid in thin- bed mortar that is applied

with a toothed trowel, although more conventional thick-bed mortar

can be used. AAC has a long life and does not produce toxic gases after it has been put in place.


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Green walls provide multiple benefits when dealing with the

vertical space in urban environments. Many of the world's

existing installations appear to be primarily motivated by art,

and the visual impact they provide. This is important but we

believe there are sound ecological reasons to install green

walls:

reduction of thermal loading to buildings - lower heating and

cooling costs = lower carbon emissions

reduction of heat island effect - less reflected heat

stormwater attenuation - panels can absorb over 30kgs per

m2 of rainwater

air purification - plants are efficient filters of pollution -

especially when used indoors

noise attenuation - quieter buildings and streets

increased urban biomass - more green increases all of the

above

Green Walls


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ecological habitat increased even with non-native plant

species positive urban psychology - uplifting effect on those

who see it positive upgrade (retrofits) to existing urban fabric


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Why create a double skin facade?

The idea typically comes up when discussing a tall building. Tall buildings lead to the desire to have

expansive views and a great deal of glass. If you create an all glass building, It takes a great deal of

mechanical ventilation, and thus energy, to keep it cool in the summer and warm in the winter. To

mitigate this setback, the concept of the double skin facade can improve the thermal comfort, acoustic

isolation from the exterior and potentially the energy efficiency of the building. In a nutshell, we're talking

about 2 layers of glass and intermediate space or cavity. The cavity is a space of mediation between the

interior and exterior environment.


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Warm or Cool Climates

In a cool climate, the solar gain in the cavity can be circulated into the occupied space to offset mechanical

ventilation requirements. In a warm climate, the cavity is vented; the hot air rises, vents out and pulls in cooler

air behind it. This cooler cavity space reduces cooling requirements within the occupied space.

Types

Box Windows: Consists of framed inward swinging window. The cavity is divided horizontally. Vertical

divisions of the cavity at every bay prevent the spread of sounds and smells from room to room. Suited for

solid facades with punched openings.

Shaft Box: Special form of box windowed facade. Facade alternates between box windows and vertical

shafts. Shaft-box facades require fewer openings on the outside layer. This system is best suited for lower

rise construction.

Corridor Facade: Intermediate space is closed at each floor. Special care should be taken to prevent sound

transmission from room to room via the corridor. Best where high levels of sound insulation is required

between rooms.

Multistory Facade: Intermediate space is open with horizontal division. In winter, the facade can be closed at

top and bottom to exploit the conservatory effect and optimize solar energy gains. Like corridor facades,

special care should be taken acoustically.


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