Structure cooling is a highly energy efficient cooling technology that improves the indoor air quality and gives you cost saving of over 90%.
WHAT IS STRUCTURE COOLING?
During daytime thermal masses gain a lot of heat from the sun. For buildings, this heat absorbed is stored in the envelope of the building. The building walls/roof which is at a higher temperature then radiates this heat to the indoors of the building which is at relatively lower temperature, through the radiation phenomena. Structure cooling technology absorbs the heat that is stored in the building structure. This results in the building walls/roof to be at a lower temperature than the indoors which now allows the building to act as a heat absorber and take out the indoor heat. During this process, the sensible heat load in the building is reduced.
HOW DOES STRUCTURE COOLING WORK?
A network of pipes is installed in the building structure typically during construction, usually in the floor. During operation chilled water at a temperature of 26°C is circulated to remove the heat that is trapped in the building structure which is usually around 35-45°C during summers. However, this process is reversible where hot water can be circulated in the pipes in case of extremely cold conditions. The network of pipes are connected to a manifold and the manifold is connected to a two-stage cooling tower or a boiler depending on what is required according to the weather requirements, be it cooling or heating.
BENEFITS OF STRUCTURE COOLING:
- Energy consumption is minimal because there is no need of a compressor.
- Reduces cooling load of the structure.
- Provides uniform cooling/heating throughout the building.
- Occupies less floor space because the installations are done inside the floor
- Energy savings as water is circulated at 20-26°C compared to 7°C of chilled air for conventional systems.
- This process consumes only 0.03kW/ton when compared to conventional HVAC system which consumes 1.12kW/ton.
- Significant reduction in air ducts required.
- Boosts the Green rating of a building.
Structure cooling can be installed in places like malls, hospitals, office buildings, houses, commercial buildings, colleges/schools and other public utility areas where a lot of cooling load is required.
|Payback Period Calculations for 5000 Sq.ft Area|
|Cost of Radiant Cooling System with Two stage Cooling Tower||Rs 13,52,495|
|Cost of Conventional HVAC System – VRF||Rs 6,75,000|
|QTY||Per Unit||QTY||Per Unit|
|Cooling Tower (C.T) with Fan motor (KW/TR) – Radiant||20||0.035|
|Conventional HVAC System – VRF||15||1|
|Pump 1 -Cooling Tower to PHE (KW/Unit)||1||0.6|
|Pump 2 – PHE to Radiant Cooling Circuit (KW/Unit)||1||0.4|
|No. of hours of operation per day||10||10|
|No. of operating days/year with C.T||330||330|
|Cost of Electricity (Rs./KWH)||6||6|
|Annual energy cost (Total Tons x KW/TR x No. of hours/Day x No. of Days/year x Cost of Electricity/(KWH) x Operating Factor)||Rs 33,660||Rs 2,97,000|
|Difference in Capital Costs between the two systems||Rs 6, 77,495|
|Difference in Annual Operating Costs||Rs 2, 63,340|
|Simple Payback in Years||2.57|