Thermodynamic analysis of a new tandem dual-temperature air source heat pump with ejector

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-11 DOI:10.1016/j.ijrefrig.2024.08.027

Yuefen Gao , Wenjie Yang , Yiying Zhang

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Abstract

This paper presents a conventional air source heat pump cycle (CHPC) and two dual-temperature air source heat pump cycles (DTHPC1 and DTHPC2). DTHPC1 employs two condensers, while DTHPC2 adds an extra compressor and combines the ejectors on top of DTHPC1. Compared with the conventional heat pump cycle, the new dual-temperature heat pump DTHPC2 can provide hot water at one additional temperature and still have high performance. In this paper, the refrigerants R1234yf and R1234ze(E) were selected as suitable for the cycle conditions. The cycle performance under different conditions was simulated and compared based on energy analysis methods and exergy analysis methods. The main performance parameters included COP_h, η_ex, etc. The results demonstrate that the COP_h and η_ex of DTHPC2 and DTHPC1 are greater than those of CHPC under identical conditions. Specifically, at an ambient temperature of approximately -10 °C, high-temperature hot water of approximately 65 °C, and low-temperature hot water of approximately 35 °C, the COP_h of DTHPC2 and DTHPC1 increased by 45% and 32.7%, respectively, in comparison to CHPC. Similarly, the η_ex of DTHPC2 and DTHPC1 increased by 27.1% and 28.9%, respectively.

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带喷射器的新型串联双温空气源热泵的热力学分析

本文介绍了一种传统的空气源热泵循环（CHPC）和两种双温空气源热泵循环（DTHPC1 和 DTHPC2）。DTHPC1 采用两个冷凝器，而 DTHPC2 则在 DTHPC1 的基础上增加了一个压缩机并将喷射器合并在一起。与传统的热泵循环相比，新型双温热泵 DTHPC2 可以多提供一个温度的热水，而且性能仍然很高。本文选择了适合循环条件的制冷剂 R1234yf 和 R1234ze(E)。根据能量分析方法和放能分析方法，模拟并比较了不同条件下的循环性能。主要性能参数包括 COPh、ηex 等。结果表明，在相同条件下，DTHPC2 和 DTHPC1 的 COPh 和 ηex 均大于 CHPC。具体而言，在环境温度约为 -10 °C、高温热水约为 65 °C、低温热水约为 35 °C的条件下，DTHPC2 和 DTHPC1 的 COPh 与 CHPC 相比分别增加了 45% 和 32.7%。同样，DTHPC2 和 DTHPC1 的 ηex 分别增加了 27.1% 和 28.9%。

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.