Vapor compression heat pump for drying room
A conventional technique to upgrade low temperature heat to a
higher temperature level is heat pump system. The common method
could be performed by vapor compression heat pump (VCHP) which
the main components are compressor, condenser, evaporator and
expansion valve as shown in Figure 6. The working fluid has a low
boiling temperature. At state 1, the fluid in vapor phase is compressed
in the compressor to state 2 and the vapor condenses in the condenser at
a high pressure and temperature to be liquid at state 3. The liquid is then
throttled to a low pressure at state 4 via the expansion device and the
temperature drops down thus the fluid could absorb low temperature
heat at the evaporator where the fluid boils at low temperature to be
vapor again and the new cycle restarts.