Multi-factor coupling optimization of heat recovery effectiveness in a transcritical CO2 heat pump

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-07-21 DOI:10.1016/j.ijrefrig.2024.07.018

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Abstract

In the background of energy shortage and climate change, transcritical CO₂ heat pump(HTP) technology has attracted lots of attention because of its energy-saving and environmentally friendly advantages. In this research, an experimentally verified simulation model of transcritical CO₂ HTP is established to investigate multi-factor coupling optimization of heat recovery effectiveness(η_IHX). First, the coupling optimization mechanism of η_IHX and discharge pressure(p_dis) is analyzed. Moreover, this research explores the influence of η_IHX on heating capacity, power consumption, discharge temperature(t_dis), and internal heat exchanger(IHX) cost, and further proposes a comprehensive heat recovery index to optimize the above factors. Based on this index the optimal heat recovery effectiveness(η_IHX,opt) for each operating condition is obtained. Also, a failure boundary for the coupling optimization of the η_IHX is also indicated. In addition, the optimal discharge pressure(p_dis,opt) prediction correlation for different η_IHXs is proposed, which can be used for heat recovery effectiveness collaborative optimization control. Finally, a general method for evaluating IHX is provided. Taking Xi'an as an example, the optimal heat recovery area(A_IHX,opt) of this HTP system is 0.42m², with which the optimized HTP system operates safely at extreme operating conditions, resulting in an annual lucre of 1,211 CNY.

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多因素耦合优化跨临界二氧化碳热泵的热回收效果

在能源短缺和气候变化的背景下，跨临界二氧化碳热泵（HTP）技术因其节能环保的优势而备受关注。本研究建立了经实验验证的跨临界二氧化碳热泵仿真模型，研究了热回收效率（ηIHX）的多因素耦合优化。首先，分析了ηIHX与排气压力（pdis）的耦合优化机理。此外，该研究还探讨了ηIHX对热容量、电耗、排出温度(tdis)和内部换热器(IHX)成本的影响，并进一步提出了优化上述因素的综合热回收指标。根据该指标，可以得到各种运行条件下的最佳热回收效率（ηIHX,opt）。同时，还指出了 ηIHX 耦合优化的失效边界。此外，还提出了不同 ηIHX 的最佳排放压力（pdis,opt）预测关联，可用于热回收效果的协同优化控制。最后，提供了评估 IHX 的一般方法。以西安为例，该热电联产系统的最佳热回收面积（AIHX,opt）为 0.42 平方米，优化后的热电联产系统在极端工况下安全运行，年利润为 1,211 元人民币。

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.