Climate Zone Cold Climate
Solar Passive Design Building, Himachal Pradesh State Government Secretariat, Shimla
General Information:
Client: Himachal Pradesh State Government Secretariat
City: Shimla
Climate: Cold
Operational schedule – 7 hours, 6 working days in a week
Green Building Design Features:
Building Design
Orientation
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Longer Facades: NE-SW
- NE façade gets a certain amount of daylight and solar heat
due early in the mornings.
- SW facade has more optimum amount of daylight and solar heat
in winter months
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Building Envelope |
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Walls
Walls of air-conditioned zones in all blocks – 230mm brick with
12.5mm plaster
Roof
150mm concrete slab with cement tile
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Windows
- 6 mm clear single glazed windows
- Clear glass helps in receiving required amount of solar heat
gain in early mornings and winter months which is required in
cold climate of Shimla
- SC – 0.87, U-value of Glass – 5.8 W/m2K, WWR – 50%
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Building Lighting
Lighting system
- Lighting system accounts for 29.7% (indoor: 95kW)
- Luminaries used: mostly open type luminaires in office spaces,
CFLs with electronic ballasts in corridors
and florescent lamps in storages, electrical and mechanical
rooms
- LPD – 7.72W/m2
- The LPD (7.72W/m2) is less than the max allowed LPD of ECBC
(10.8W/m2), which is very good
- The electronic ballasts saves approx 20-30% in energy consumption
over the standard ballasts
- Good natural light available in office spaces
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HVAC System Design
- Central heating plant with capacity of 1470kW
- Block1: 630kW, Block2: 840kW
- COP: 1 (rated)
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Energy performance of the building
Lighting Energy Performance of the Building
- Annual Consumption (lighting) – 356044 KWh
- Lighting Performance Index – 28 KWh/Sqmt/annum
Space Conditioning Energy Performance of the Building
- Annual Consumption (A/C) – 518208 KWh
- HVAC Performance Index – 41 KWh/Sqmt/annum
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Annual energy consumption due to lighting & air conditioning (kWh):
437,126
Energy Performance Index of the building (annual energy consumption
in lighting and AC system/ total built up area):70 kWh/m2/yr |
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| Comparison of various parameters
for solar passive design strategies(ARMSDALE) with conventional
case
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| Parameters |
Solar passive Case (Existing Building) features |
Conventional Case (Building features) |
| Building orientation |
Building longer facades are facing SW-NE
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Building Longer East-west orientation |
| No roof and wall shading |
No roof and wall shading |
| Building Envelope |
No insulation on wall and roof.
U value for Wall -1.92 W/m2/K
U Value for Roof-2.74W/m2/K
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No insulation on wall and roof.
U value for Wall -2.7 W/m2/K
U Value for Roof-2.68 W/m2/K
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Single Glazed windows (U value of glass
- 5.8 W/m2/K and Shading coefficient - 0.87)
WWR – 50%
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Single Glazed windows (U value of glass
- 4.3 W/m2/K and Shading coefficient - 0.89)
WWR – 28%
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| Building Lighting Power density |
Lighting power density is 7.72 W/m2
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Lighting power density 12.4 W/m2 |
| Building Chiller |
2 centrally heating plants each capacities
of 630kW and 840kW |
2 boilers of 600 kg/hr |
| Energy performance Index (KWh/m2/yr) |
70 |
237 |
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