Efficiency evaluation of a miniature multi-stage compressor under insufficient inter-stage cooling conditions. (January 2019)

• Record Type: Journal Article
• Authors: Liu, Yinshui; Miao, Na; Deng, Yipan; Wu, Defa
• Is Part Of: International journal of refrigeration. Volume 97(2019)
• Page Start: 169
• Page End: 179
• Publication Date: 2019-01
• Subjects: Miniature multi-stage compressor -- Insufficient inter-stage cooling -- Volumetric efficiency -- Isentropic efficiency; Compresseur miniature multiétagé -- Refroidissement insuffisant entre les étages -- Rendement volumétrique -- Rendement isentropique; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2018.09.009
• Languages: English
• ISSNs: 0140-7007

Abstract

Abstract: A miniature multi-stage compressor (MMSC) with an integrated inter-stage cooler has been proposed. This study aims to evaluate the efficiency of each stage of the MMSC under insufficient inter-stage cooling conditions through numerical simulation. The results show that the volumetric efficiency of first-stage, second-stage, third-stage and fourth-stage reduced by an average of 1.43%, 1.86%, 2.32%, and 2.56% respectively as suction temperature increases every 10 °C, indicating that the temperature has more remarkable influences on the volumetric efficiency with the increase of pressure and the decrease of cylinder diameter. For every 10 °C increase in temperature, the isentropic efficiencies are all reduced by about 1%. And it should be noted that when the suction temperatures of the second, third, fourth stage cylinder exceed 120 °C, 70 °C, and 50 °C, respectively, the valve flutters severely, indicating that the valve has a poor applicability to the current operating conditions.