Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-12-09 DOI:10.1016/j.csite.2024.105625

Zeye Zheng, Qichao Yang, Wenting Zhang, Yuanyang Zhao, Guangbin Liu, Liansheng Li

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引用次数: 0

Abstract

Mechanical subcooling is an efficient means of enhancing the performance of CO2 transcritical refrigeration systems. With the aim of further improving the system performance, this objective of this paper is the comparative analysis on mechanical subcooling CO2 transcritical refrigeration system integrated with throttling valve (MCVS) and expander (MCES). A thermodynamic model for parametric analysis was developed on energy, exergy and economic perspectives. The model is validated with literature data. The simulation results indicate that there exists simultaneously optimum discharge pressure and subcooling degree maximizes the COP of MCVS and MCES. While the cooling capacity of MCES is 4.30 %–5.67 % lower than that of MCVS at a given CO2 mass flow rate, the incorporation of expansion work recovery leads to a total power consumption reduction of 8.53 %–11.29 % for MCES compared to MCVS, resulting in a corresponding increase in COP by 10.01 %–11.11 %. Additionally, exergy efficiency is improved by 10.74 %–11.48 %. Despite the addition of an expander in the MCES system, it offers advantages such as a smaller scale and lower power consumption for the mechanical subcooling system, ultimately leading to superior economic benefits compared with the MCVS system.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.