Performance enhancement of combined cooling and power cycle through composition adjustment in off-design conditions

Xiaocun Sun, Lingfeng Shi, Hua Tian, Xuan Wang, Yonghao Zhang, Yu Yao, Bowen Lu, Rui Sun and Gequn Shu

Energy, 2023, vol. 278, issue PA

Abstract: The combined cooling and power cycle has wide applications ascribed to the feasibility of simultaneously providing cooling and electricity. CO2-mixture based combined cooling and power cycle is a promising technology for remarkable performance. However, optimal compositions of working fluid in sub-cycles are usually different when operating with CO2-mixture. In off-design conditions, the mismatch between compositions and sub-cycles may further aggravate. This study employs composition-adjustable combined cooling and power cycle to solve the above problem and off-design performance in various boundary conditions is investigated. A refrigeration truck operated in highway condition is selected as the research objective. The results show that the optimal compositions of working fluid in sub-cycles are disparate in different engine operating conditions and the composition-adjustable system performs better than composition-fixed system in most engine operating points. Beyond satisfying the demand of 7.73 kW (−20 °C) cooling capacity, the total net power output of composition-adjustable system could reach 2.41 kW in the whole operating conditions, which is 7.11% higher than composition-fixed system (2.25 kW). In addition, composition-adjustable system has a much broader operating feasibility to the shift of heat sink inlet temperature and is more suitable for the application with large cooling requirements.

Keywords: Combined cooling and power cycle; Composition adjustment; Off-design; CO2 mixture (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:278:y:2023:i:pa:s0360544223012197

DOI: 10.1016/j.energy.2023.127825

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