Energy and exergy analysis of a two-stage cascade vapor compression refrigeration system with modified system configuration

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-10-10 DOI:10.1016/j.ijrefrig.2024.10.013

Dave Nygeil G. Patiluna , Edgar Alan A. Donasco , Noel M. Hernandez , Junil Bien A. Mamalias , Rommel R. Viña

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Abstract

This study proposes a modification to the two-stage cascade vapor compression refrigeration system by adding internal heat exchangers that function as subcoolers and desuperheater. The influence of each internal heat exchanger proposed on the exergy destruction rate, exergy efficiency, compressor power consumption, ECOP, and COP of the system was investigated. Additionally, various refrigerant combinations were considered as working fluids to evaluate which combination is the most suitable for the proposed system. Mathematical models based on the principles of thermodynamics were established in Engineering Equation Solver (EES), a software used for energy and exergy analysis. The results reveal that the addition of specific internal heat exchangers causes either an increase or decrease in overall system performance, depending on the type of refrigerant combination used. Consequently, there exists an optimal system configuration for each refrigerant combination. Compared with the conventional two-stage cascade refrigeration system, the optimal system configurations in the present study exhibited higher overall system performance. A maximum increase in exergy efficiency, ECOP, and COP of 7.31 %, 9.8 %, and 7.3 %, respectively, can be observed with the refrigerant combination R450A/R404A. Additionally, the results of the exergy analysis identify that the HTC compressor, condenser, LTC compressor, and cascade condenser are the primary contributors to the exergy destruction rate within the system.

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采用改进系统配置的两级串联蒸汽压缩制冷系统的能量和放能分析

本研究提出了一种对两级串联蒸汽压缩制冷系统的改进方法，即增加内部热交换器，作为过冷器和减温器。研究了所提出的每种内部热交换器对系统的放能破坏率、放能效率、压缩机功耗、ECOP 和 COP 的影响。此外，还考虑了各种制冷剂组合作为工作流体，以评估哪种组合最适合所提议的系统。根据热力学原理在工程方程求解器（EES）中建立了数学模型，该软件用于能量和放能分析。结果表明，根据所使用的制冷剂组合类型，增加特定的内部热交换器会导致系统整体性能的提高或降低。因此，每种制冷剂组合都有一个最佳系统配置。与传统的两级串联制冷系统相比，本研究中的最佳系统配置表现出更高的整体系统性能。制冷剂组合 R450A/R404A 的放能效率、ECOP 和 COP 的最大增幅分别为 7.31%、9.8% 和 7.3%。此外，放能分析结果表明，HTC 压缩机、冷凝器、LTC 压缩机和级联冷凝器是造成系统内放能破坏率的主要因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.