Evaluation of the Effects on COP by the Pressure Pulsation in the Two-Stage Compressed Injection Cycle

Abstract

The purpose of this research is to evaluate the performance characteristics of two-stage compressed gas injection cycle with respect to the pressure pulsation experimentally. The pressure pulsation is generated by the cyclic flow between two compressor chambers. It has been thought that pressure pulsation affect not only the pressure difference between both ends of the injection pipe but also flow rate in this pipe. However, these effects and performance characteristics caused by pressure pulsation are not clear. This paper shows that the pressure wave is transmitted from the injection port of the compressor to the gas-liquid separator through the injection pipe and COP is varied by the length of injection pipe cyclically. Appropriate injection pipe length can be calculated using the resonance wavelength caused by compressor rotational speed.