Carrier: Heat Recovery Systems

In the previous issue of the Green Buildings magazine we reviewed heat recovery systems based on heat pumps with water-cooled condenser. Continuing the theme begun in this issue examine monobloc air-cooled chillers with air-cooled condensers.

THEORETICAL BASIS OF THE HEAT RECOVERY IN THE CHILLERS LOOP
In the evaporator, the heat of the coolant (water) coming from the air conditioning system components (heat exchangers, cooling central air conditioners, fan coils), consumed refrigerant (Freon), whereby it boils. Through the suction pipe low pressure steam is supplied from the evaporator to the compressor. The compressor sucks the steam from the evaporator and squeezes it. As a result, the temperature and vapor pressure are increased to such a magnitude that it can be condensed under the influence of a cooling medium (e.g., air in a remote air-condenser or water from the cooling towers).

The steam under high pressure and temperature is pumped and fed by the compressor to the condenser via the discharge conduit. After the surface of the condenser the heat from the hot refrigerant vapor is passed to the cooling medium, whereby the vapor is liquefied. Through the fluid carrying line the coolant fluid flows to the refrigerant flow controller (EXV). Flow-rate regulator dispenses the appropriate amount of refrigerant entering the evaporator, and lowers its pressure to boil at the required low temperature.

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Text: Mikhail Terekhov, senior technical expert, AHI Carrier FZC, PhD. tehn. Sciences, ASHRAE member