A、insufficient condenser cooling water
B、excessive condenser cooling water
C、air in the refrigeration system
D、excessive refrigerant in the system
更多“Low compressor head pressure in a refrigeration system can be caused by（）.”相关的问题
A、protect the compressor from liquid flood back B、protect the compressor from low discharge pressure C、start and stop the compressor upon system demand D、start the compressor after a drop in the evaporator pressure
A、relieve excessive compressor head pressure B、produce flash gas at the expansion valve C、reduce flooding of the receiver at low load D、defrost the evaporator coils
A、High pressure compressors are more efficient than low pressure compressors B、Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit C、Two stage compressors are generally more efficient than single stage compressors D、The volumetric efficiency is decreased in multistage compressors
A、The density of the air entering the compressor B、The temperature of the air entering the compressor C、The designed rotating speed of the compressor D、A leaking head gasket
A、too much superheat B、insufficient superheat C、suction pressure too low D、excessive refrigerant returning to the compressor
A、maintain liquid refrigerant at the suction of the compressor B、maintain a preset suction pressure to the compressor C、start and stop the compressor at preset operating pressures D、operate at minimum efficiency
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