General Information:

City: Hyderabad
Climate: Hot & Dry
Operational schedule – 10 hours, 5 working days in a week
Area of the building: 21778m² (2 towers each of 5 floors including ground floor)

Function of the building: Office Space

Existing Building Design Features

Building Envelope

Walls 230mm brick wall with 30mm plaster on exterior side and 20mm on interior side 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
Window Double glazing windows with aluminium frames WWR – 60% The glazing of the building has been designed to maximize the effect of natural light, largely eliminating the need for artificial light during day time WWR which is higher than ECBC recommended (40%) increases external solar heat gain and cooling loads
Building Lighting
Lighting system 19 % of the total connected load (150 kW during daytime) 32W & 18W OSRAM CFL with electronic chokes The LPD 12.7 W/m2 is higher than that of ECBC recommended (11.8 W/m2) for office space which has high energy consumption potential. Lighting energy consumption: 19.3%
Lighting controls Manual lighting controls used in the building No occupancy sensors	HVAC system Design Central AC plant with 4 air cooled screw chillers of 270TR each The COP of the chillers is 3.05 (rated) / ECBC recommended is 3.05 Rated Sqft/TR – 166
Energy Performance of the Building Lighting Energy Performance of the Building Annual Consumption (lighting) – 30% Lighting Performance Index – 47 KWh/Sqmt/annum Space Conditioning Energy Performance of the Building Annual Consumption (A/C) – 70% of the total HVAC Performance Index – 137 KWh/Sqmt/annum
Annual energy consumption due to lighting & air conditioning (kWh): 3323335 Energy Performance Index of the building (KWh/Sq.mts of built up area/annum): 199