Another factor that influences the choice of compressor is the evaporation temperature range that the system requires. Thus, we can point to two extremes:
. Freezers that work at fairly low temperatures, ranging from -25 ° C to -35 ° C.
Dehumidifier working with evaporation temperature above
of 0 ° C. The absorption of heat by the refrigerant will depend on the evaporation temperature. At a certain temperature in the evaporator corresponds a certain pressure. The gas density is high at low temperatures and therefore only a small amount of heat can be absorbed during evaporation. If evaporation occurs at a higher temperature, e.g. 0 ° C, the pressure and density will increase and the amount of heat absorbed will be greater. For this reason, we can conclude that the work performed by the engine on a high-temperature evaporator will be larger than that performed by the same compressor at low
evaporation temperature. Consequently, engines for
application in high-pressure evaporation systems must have higher operating torque.
Compressors can be classified as to their application:
HBP. High Back Pressure (high return pressure) High evaporation temperature
MBP. Medium Back Pressure (average return pressure) Average evaporation temperature
LBP. Low Back Pressure Low evaporation temperature
