Several
heat transfer loops work in an HVAC system .In these heat transfer loops heat
energy is exchanged to achieve the ultimate purpose of heating and cooling of
air in HVAC system.
These heat transfer loops are basic organs of any HVAC system. Problem in any of these loops affects the HVAC system .In these heat
transfer loops thermal or heat energy moves from left to right as it is
extracted from the space and rejected into surroundings or air through five
loops of heat transfer.
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Heat transfer loops in HVAC system |
1. Indoor air loop in HVAC
system
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 or different HVAC zones.
2. Chilled water loop in HVAC
system
Driven by the
chilled water pump, water returns from the cooling coil to the chiller’s evaporator
to be re-cooled.
3. Refrigerant loop in HVAC
system
Using a phase-change refrigerant, the
chiller’s compressor pumps heat from the chilled water to the condenser water.
4. Condenser water loop in HVAC
system
Cooling water absorbs heat from the chiller’s
condenser, and the condenser water pump sends it to the cooling tower.
5. Cooling tower loop in HVAC
system
The cooling tower’s fan drives air across an open flow of the hot
condenser water, transferring the heat to the air.Thus cooling tower rejects heat to atmosphere in this way.
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