Utilization of Volumetric Displacement in Reciprocating Compressors

The main factors affecting utilization of volumetric displacement of reciprocating compressors are analysed. A coherent system of parameters to quantify these is formulated. Reference is made to conventional parameters and to the work of other authors. Some new parameters are introduced and int~rrelationships are described. The overall_purpose of the theory is to apportion shortcomings in the volumetric efficiency of reciprocating compressors to specific causes, on the basis of test measurements. The measurement problems which would arise in applying the theory fully are not addressed. THE PROCESSES OF THE RECIPROCATING CCMPRESSOR CYCLE Fig. 1 illustrates the cycle of a reciprocating compressor as a diagram of cylinder pressure versus volume. The horizontal lines through points 4 and 1 and through points 3 and 2 represent the mean values of the fluctuating pressures within the suction and discharge pipes respectively.