Experimental Analysis of the Performances of Unit Refrigeration Systems Based on Parallel Compressors with Consideration of the Volumetric and Isentropic Efficiency
  • Daoming Shen1,2,*, Chao Gui1, Jinhong Xia1, Songtao Xue2,3
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: shen2019@xxu.edu.cn
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.
Keywords
Parallel compressor unit; evaporation temperature; condensation temperature; pressure ratio; refrigeration capacity; energy efficiency ratio (COP)
Cite This Article
Shen, D., Gui, C., Xia, J., Xue, S. (2020). Experimental Analysis of the Performances of Unit Refrigeration Systems Based on Parallel Compressors with Consideration of the Volumetric and Isentropic Efficiency. FDMP-Fluid Dynamics & Materials Processing, 16(3), 489–500.