Structure cooling is a highly energy efficient cooling technology that improves the indoor air quality and gives you cost saving of over 90%.


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.


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.

Structure Cooling Slab
Structure Cooling Slab


  • 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
Description Radiant VRF
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
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