All areas are served by a central air conditioning plant. The HVAC system comprises of a conventional cooling system, radiant cooling, heat pump, VRF indoor/outdoor, and ventilation mechanism.
Conventional Cooling Systems
The high side comprises of one water cooled screw chiller of 232 TR capacity. This system uses two primary pumps of 590 gpm, two secondary pumps of 590 gpm, two condenser pumps of 725 gpm, and one cooling tower of 232 TR capacity. For generating energy savings, secondary pumps are integrated with variable frequency drives which modulate them depending upon the differential pressure across the chilled water circuit.
On the low side, chilled water from the secondary pumps is circulated across the AHU and ceiling suspended units to meet thermal comfort requirements of the spaces. Each AHU room has fresh air provision via fresh air dampers to maintain indoor air quality.
Radiant Cooling Systems
It comprises of one water cooled screw chiller of 186 TR capacity. This system comprises of two primary pumps of 510 USGPM, two secondary pumps of 633 USGPM, two condenser pumps of 573 USGPM and one cooling tower of 186 TR capacity. Secondary pumps are integrated with variable frequency drives which help in energy savings depending upon the heat load prevalent in the concerned spaces.
VRF Indoor/ Outdoor System
VRF indoor and outdoor units are installed in the concerned spaces in the facility. These Daikin units have both heating and cooling functions.
Heat Pump System
Scroll type heat pump is installed in the facility whose cooling capacity is 180 TR and heating capacity is 606 KW. It is integrated with the equipment of radiant and conventional cooling system and has the capability to serve both these systems. Depending upon the heat load and thermal comfort requirement, the facility can operate the heat pump.
As an energy efficient measure, the facility has commissioned heat recovery units to utilize the cool return air to lower the temperature of outdoor air. These units are installed on the terrace level. Exhaust fans are commissioned in the facility. For maintaining required pressure in lifts and staircases, axial fans are installed.
There are two sources of water in the facility – potable water supplied by the municipality and treated sewage water. The treatment is packaged unit type. After the tertiary treatment, treated effluent is used for flushing, landscaped irrigation, and HVAC. Capacity of sewage treatment is 40 KLD and is designed to treat combined sewage i.e. soil and wastewater.
At least 50% of the water is treated and recycled on the site. In the washroom, all fixtures have dual valves (1.06 gallons full flush and 0.53 gallons half flush). The flowrates of the water fixtures range from 0.71 gpf to 0.80 gpf. This results in about 46% reduction in the use of water.
All installed lighting are LEDs. In all the regularly occupied spaces there is provision for automatic lighting shut-off that results in power saving. General lighting in each space is controlled separately. Occupancy sensors too shut off lights when offices and meeting rooms are unoccupied.