Abstract
SYNOPSIS When a refrigerant cooled rotary sliding vane compressor was used in a heat pump application, using refrigerant R22, a discrepancy was found to exist between the measured shaft power and the apparent power absorbed based on refrigerant properties and thermodynamic considerations. An explanation for this discrepancy is suggested and is based on the fact that when liquid refrigerant injection into the compression chamber is used for cooling purposes, the refrigerant mass flow rates through the condenser and evaporator are not the same. This results in a reduction of the specific enthalpy at compressor discharge, when compared with the situation where no refrigerant injection is used. It is shown that when liquid injection is suppressed, the measured power and the calculated power are comparable. From this a compression process applicable to the compressor operating with liquid injection is proposed.
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