ABSTRACT
Heat pumps are one of the most underused means of conserving energy for heating and cooling of
buildings. The basic components of a heat pump are a working fluid or refrigerant, a gas compressor, two
heat exchangers, piping, controls and accessories which can provide either heating or cooling to a building
space. In the heatingmode, heat is extracted fromanatural or waste heat source and transferred to the space
while in the cooling mode, heat is removed from the building and discharged to a heat sink.
