Open Access

Experimental Analysis of the Performances of Unit Refrigeration Systems Based on Parallel Compressors with Consideration of the Volumetric and Isentropic Efficiency

by Daoming Shen, Chao Gui, Jinhong Xia, Songtao Xue

1 College of Civil Engineering and Architecture, Xinxiang University, Xinxiang, 453000, China
2 Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai, 20092, China
3 Department of Architecture, Tohoku Institute of Technology, Sendai, 982-8577, Japan

* Corresponding Author: Daoming Shen. Email:

Fluid Dynamics & Materials Processing 2020, 16(3), 489-500. https://doi.org/10.32604/fdmp.2020.08969

Received 29 October 2019; Accepted 08 March 2020; Issue published 25 May 2020

Abstract

The performances of a refrigeration unit relying on compressors working in parallel have been investigated considering the influence of the compressor volumetric efficiency and isentropic efficiency on the compression ratio. Moreover, the following influential factors have been taken into account: evaporation temperature, condensation temperature and compressor suction-exhaust pressure ratio for different opening conditions of the compressor. The following quantities have been selected as the unit performance measurement indicators: refrigeration capacity, energy efficiency ratio (COP), compressor power consumption, and refrigerant flow rate. The experimental results indicate that the system refrigeration capacity and COP decrease with a decrease in evaporation temperature, increase of condensation temperature, and increase in pressure ratio. The refrigerant flow rate increases with the increase in evaporation temperature, decrease in condensing temperature and increase in pressure ratio. The compressor power consumption increases with the increase in condensing temperature and increase in pressure ratio, but is not significantly affected by the evaporation temperature.

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