BLOCKED SUCTION UNLOADING IMPROVES PART LOAD EFFICIENCY OF SEMI-HERMETIC RECIPROCATING COMPRESSOR

摘要

This paper illustrates the improvement in part load efficiency of a semi-hermetic reciprocating compressor gained by using blocked suction unloading. The efficiency and operation of blocked suction unloading is compared with top head unloading and suction valve lifter unloading. A description is given for each of the three types of unloading. In addition to having the best part load efficiency, blocked suction unloading results in lower motor temperatures when compared to top head unloading. In conclusion, blocked suction unloading is shown to be the most efficient of the three methods for unloading compressor cylinders.