Experimental and economic analysis with a novel ejector-based detection system for thermodynamic measurement of compressors

Xiaoqiong Li, Xiaoyan Wang, Yufeng Zhang, Lei Fang, Na Deng, Yan Zhang, Zhendong Jin, Xiaohui Yu and Sheng Yao

Applied Energy, 2020, vol. 261, issue C, No S0306261919320823

Abstract: The research of the high-temperature heat pump compressors above 100 °C has brought great challenges by its detection system, and in this study, a novel ejector-based detection system has been proposed to measure the thermodynamic performance of the heat pump compressors. The paper began with a numerical method to design the nozzle and diffuser of the ejector. Compared with the results of gas dynamics calculation, the deviations of nozzle and the diffuser were lower than 10.38% and 3.38%, respectively. Furthermore, the compressor performance was analyzed at the suction temperature in the range of 90–110 °C while the speed in the range of 2820–3060 r/min. The results showed that the compression ratio varied from 2.3 to 2.7, and the volumetric efficiency as well as isentropic efficiency was 90% and 70%, respectively. Assuming that the compressor was used in a heat pump system at the same operating condition, it was noteworthy that the highest discharge temperature was 184.8 °C and the coefficient of performance was more than 3.9. In an actual case, the initial investment cost of the ejector-based detection system is 3311 $, while that of the heat pump detection system is 59,795 $, the economical saving can reach to 94.5%. This is due to the exchanger has been omitted in ejector-based detection system compared with the traditional heat pump detection system. All in all, the novel system was reliable and economical.

Keywords: Ejector-based detection system; High-temperature; Compressor; Virtual heat pump; Economic analysis (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (2)

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DOI: 10.1016/j.apenergy.2019.114395

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