Pressure Drop Between Evaporator And Compressor

Section 4.12 addressed for the reciprocating compressor the precaution that there will always be some pressure drop in the suction line between the evaporator and compressor. If an evaporator is operating at a temperature of -30°C (-22°F) a compressor selected for this saturated suction temperature will be about 5% short of capacity if its actual saturated suction temperature is -31°C (-23.8°F). When ordering a compressor, then, it is essential that the compressor be selected for a lower saturated suction temperature than the evaporating temperature. This requirement applies equally to screw and reciprocating compressors.

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