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Since the air is being supplied very close to the user, the supply air temperature settings can be raised to about 17ºC to 20ºC. The air will pick-up heat and rise into the return air plenum above the ceiling and return at a temperature of about 25ºC to 30ºC. This system can work well in dry weather or in situations where higher humidity is required or can be tolerated. The energy savings result from reduced chiller operation due to higher supply air temperature settings. The absence of ducting leads to reduced static pressure requirements and hence reduced fan power.

The ice is built uniformly throughout the tank by the patented temperature averaging effect of closely spaced counter-flow heat exchanger tubes (Fig. 1). Water does not become surrounded by ice during the freezing process and can move freely as ice forms, preventing damage to the tank. At night, the water-glycol solution circulates through the chiller and the tank’s heat exchanger, bypassing the process or air handling unit. The fluid is 46 around –3ºC to –4 ºC and freezes the water surrounding the heat exchanger.

This results in the room inner wall surface being at temperatures higher than that of the human body. This results in discomfort as the human body is unable to radiate heat to the walls; hence heat transfer (body cooling) is possible only by convection (air movement) and perspiration. Cooling of the building structure (walls and roof) itself can lead to dramatic reduction in the wall temperature and human comfort. Building structure cooling helps neutralize this solar heat load by cooling the structure itself.

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