Air condition cycle of Central Air condition system

There are several heat transfer loops in a refrigeration system as shown in Figure 2. Thermal  energy moves from left to right as it is extracted from the space and expelled into the  outdoors through five loops of heat transfer.

Indoor air loop: In the left loop, indoor air is driven by the supply air fan through a  cooling coil, where it transfers its heat to chilled water. The cool air then cools the  building space.

Chilled water loop: Driven by the chilled water pump, water returns from the cooling coil  to the chiller’ s evaporator to be re-cooled.

Refrigerant loop: Using a phase-change refrigerant, the chiller’ s compressor pumps heat from the chilled water to the condenser water.

Condenser water loop: Water absorbs heat from the chiller’ s condenser, and the  condenser water pump sends it to the cooling tower. 

Cooling tower loop: The cooling tower’ s fan drives air across an open flow of the hot
condenser water, transferring the heat to the outdoors.