PCNTDA

Building basics

Year of completion	2013
Number of units	None
Number of occupants	None people
Elevation	560 m

Building areas

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Special features

1. Sewage treatment plant (STP) has been installed on the site for treatment of waste water which is then used for landscaping purposes.
2. Low flow water fixtures have been installed to minimize the water wastage.
3. More than 60% of the interiors are furnished from low energy materials.
4. Energy efficient artificial lighting system, comprising of LED’s and tubular fluorescent lamps, has been installed in the building.
5. More than 50% of the annual water demand of the building is met through rain water harvesting.
6. The building has plenty of daylight, more than 60% of the building spaces are day lit.

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The building envelope comprises of heavy weight construction. The external walls of the building has U factor of 1.8 W/m²K. The wall consists of 1.5 cm thick cement plaster, 23 cm thick fly ash brick wall and 1.5 cm thick cement plaster. The total surface area of the external wall comes out to be 10,532 m².

The ground floor comprises of by 12.5 cm brick, 15 cm PCC slab, 4 cm cement mortar, and 0.8 cm thick cement tiles. U value of the ground floor is 2.156 W/m²K with a total surface area of 11,96.8 m².

The external roof of the building consist of 2 cm screed on top, 11.5 cm water proofing, 10 cm brick bat coba, 15 cm RCC slab, 7.5 cm air gap and 1.5 cm mineral board for acoustics.

Windows comprises of double-glazed with gas filling (SHGC 0.34) and aluminium frame. Total window area inclusive of the frame is 3983.1 m².

Type of construction	Middle
Shading	Fixed external shading elements

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Ground floor

U-value	2.156 W/m2K
Total thickness	32.50 cm
Total area	m2

Material	Thickness	Thermal conductivity λ
Brick	12.50 cm	1.270 W/mK
PCC Slab	15.00 cm	1.740 W/mK
Cement Mortar	4.00 cm	0.719 W/mK
Ceramic Tile	1.00 cm	1.372 W/mK

(From outside to inside)

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External walls

U-value	2.500 W/m2K
Total thickness	26.50 cm
Total area	m2

Material	Thickness	Thermal conductivity λ
Cement Plaster	1.50 cm	0.721 W/mK
Flyash Block	23.00 cm	0.900 W/mK
Cement Plaster	2.00 cm	0.721 W/mK

(From outside to inside)

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Upper ceiling

From outside to inside.

U-value	None W/m2K
Total thickness	9.50 cm
Total area	m2

Material	Thickness	Thermal conductivity λ
Airgap	7.50 cm	None W/mK
Mineral Board for acoustics	2.00 cm	0.273 W/mK

(From outside to inside)

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Windows

U-value window	None W/m2K
Total area	3983 m2

Glass infill	Air
Coating/Tint	Yes
Solar heat gain coefficient	0.34
U-value glass	1.70 W/m2K
U-value window frame	None W/m2K

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Passive strategies

The building has been designed for natural ventilation, with proper arrangement of windows to enhance cross ventilation in the building. Almost 95% of the building area is non-air conditioned for 1 air changes per hour.

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Additional information

There is plenty of daylight is available in the building, more than 60% of the built up area is day lit. The high performance glazing has been used to reduce the solar heat gain in the building. In addition, 74% of the total quantity of material used for subassembly, internal partitions, false ceiling, and in built furniture is low energy material having recycled content. 62% of the total flooring is done using low energy material. The project has installed flush doors and granite doorframes in order to reduce usage of hard wood in the interiors.

There is no central heating or cooling system installed in the building. Most of the spaces of the building are designed for natural ventilation. Only 5% of the total building area is air-conditioned for which packaged air-conditioners are installed in the building.

Indoor design temperature summer	28 °C
Indoor design temperature winter	22 °C

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Heating system

There is no heating system installed in the building.

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Cooling system

The packaged air conditioning system comprising of cassette and split AC’s has been installed in the building. The ACs installed in the building have minimum 3 star BEE rating.

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Hot water system

No hot water system has been installed in the building.

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Ventilation system

The building spaces are designed for natural ventilation with ceiling fans and manual operation of windows.

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Power generation

A 100 kWp rooftop photovoltaic system has been installed in the building. The annual electricity generation is 91,158 units (kWh) approximately.

Detailed information on installed power generators not known.

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Energy efficient lighting and appliances

Energy efficient lighting has been used such as LED for outdoors and tubular fluorescent lights for interiors have been installed. Interior lighting power density of the project is 5.53 W/m².

Total energy consumption demand of the building is fed from both the electric power supplied to the building and through the captive power generated in the building. The total electricity con-sumed within the building in a year (2013) is 134,392 kWh, out of which 43,234 units are from the grid supply and 91,158 units are from the rooftop photovoltaic system generated on site.

Primary energy consumption	327697.00 kWh/year
Primary energy consumption (ref. building)	327697.00 kWh/year
Specific primary energy consumption	12.00 kWh/m2/year
Specific primary energy consumption (ref. building)	30.00 kWh/m2/year

Differentiated specific primary energy demand and production

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Accumulated specific primary energy demand and production

The total cost of the building is 4,827,290 Euro, out of which building envelope cost is 4,553,992 Euro and technical installations cost is 273,298 Euro.

Envelope costs	4553992 EUR
Systems costs	273298 EUR
Total investment costs	4827290 EUR
Yearly energy costs	15455 EUR/year

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Investment cost

Absolute building investment costs

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Specific building investment cost

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Annual Costs

Absolute annual costs

Specific annual cost

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Assumptions

Local Currency

INR

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Energy prices

Electricity

0.1150 EUR/kWh