Principle of Heat Pump
The operating principle of a
heat pump is based on the physical property that the boiling point of a fluid
increases with pressure. By lowering pressure, a medium can be evaporated at
low temperatures while an increase of pressure will lead to a high boiling
point.
This device consists of two heat exchangers, a
compressor and an expansion device. A liquid or a mixture of liquid and vapor
of a pure chemical species flows through an evaporator, where it absorbs heat
at low temperature and, in doing so, is completely vaporized.
