Energy and exergy analysis of a transcritical CO2 refrigeration system integrated with vapor injection and mechanical subcooling

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-03-10 DOI:10.1016/j.supflu.2025.106592

Zeye Zheng, Dewei Lv, Qichao Yang, Guangbin Liu, Yuanyang Zhao, Liansheng Li

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Abstract

Mechanical subcooling is an effective method to improve the transcritical CO₂ refrigeration system. To further improve its performance, a transcritical CO₂ refrigeration system is investigated with vapor injection and mechanical subcooling (MVS) using R152a as an auxiliary circulating refrigerant. A comparative analysis with the basic vapor injection CO₂ refrigeration system (BVS) and the mechanical subcooling CO₂ refrigeration system (MSS) is conducted from the perspective of energy and exergy. The results indicate that there are optimal values for the compressor discharge pressure, subcooling degree, and relative intermediate pressure coefficient, which together can maximize the COP of MVS under various operating conditions. At an evaporation temperature of −15 °C and a gas cooler outlet temperature of 40 °C, MVS has a COP of 1.9, which is 17.8 % and 4.9 % higher compared to the BVS and MSS, respectively. The exergy efficiency is increased by 9.5 % and 6.6 %, respectively.

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.