Heat pumps


Air-to-air heat pumps

Water-to-air heat pumps (water serves as heat source)

Heat pumps

100°

Heat pumps

FIGURE 14.8a

A simple through the wall air conditioner unit essentially consists of a compressive refrigeration machine.

REVERSING

VALVE

OUTDOORS 40° F

«t—

подпись: 
«t 
FIGURE 14.8b

In a "heat pump" the reversing valve allows the refrigerant to flow in either direction. In the winter condition shown, the outdoor coil becomes the evaporator and the indoor coil the condenser.

Heat source/sink: O

Air source — low cost, and it is least efficient. Water (ground) source — high cost, and it is more efficient than air.

Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning


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