High Performance Commercial Buildings in India: Adopting Low-cost Alternative Passive Strategies for Energy Saving

Case Study

General Information:

City: Noida
Climate: Composite
Operational schedule – 8 hours, 5 working days in a week
Area of the building: 10300m² (out of which 9122 m² - conditioned area, 1178 m² - Non- conditioned area)

Function of the building: Office space

Existing Building Design Features:

Building Envelope

Walls The U-value which is much higher than the ECBC standard (0.44W/m2K) increases the solar heat gain and the energy consumption Window 1/8” clear single glazed window in thermally unbroken aluminium frames (SC – 0.91 U- Value of Glass – 6.97W/m2K) WWR – 48% Clear single glazed window and WWR which is more than that of ECBC recommended (40%) increases the external solar heat gains and thereby increasing the cooling loads
Roof The U-value is higher than that of ECBC recommended (0.409 W/m2K). This results in high external solar heat gains and increased cooling loads

Building Lighting
Lighting system 14.3% of the (253kW of indoor lighting, 14kW of outdoor lighting) total connected load Fluorescent lamps and 12V miniature halogens in working spaces. CFLs in corridors and lift lobbies. Metal halide lamps and High pressure sodium lamps used for external lighting LPD – 24W/m2 The LPD (24W/m2) is double than the max allowed LPD of ECBC recommended (10.8W/m2) for office space which has high energy consuming potential Fluorescent lamps generate heat, further increasing the cooling loads Lighting energy consumption: 30%
HVAC System Design Central AC plant with five 200TR water cooled reciprocating chillers The COP of the chillers is 4.01 (rated) / ECBC recommended is 4.20 Rated Sqft/TR – 98
Energy performance of the building Lighting Energy Performance of the Building Annual Consumption (lighting) – 30% of the total Lighting Performance Index – 70 KWh/Sqmt/annum Space Conditioning Energy Performance of the Building Annual Consumption (A/C) – 70% of the total HVAC Performance Index – 183 KWh/Sqmt/annum
Annual energy consumption due to lighting & air conditioning (kWh):2382112 Energy Performance Index of the building (KWh/Sq.mts of built up area/annum):231

Conventional Building, Noida

Existing Building Design Features:

Building Envelope

Walls

Window

Roof

Building Lighting

Lighting system

HVAC System Design

Energy performance of the building

Lighting Energy Performance of the Building

Space Conditioning Energy Performance of the Building