Experimental study on ammonia/water mixture desorption heat transfer for vapor absorption-compression heat pump

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-04-15 DOI:10.1016/j.ijheatmasstransfer.2025.127114

Khalid Hamid , Chi-Chuan Wang , Ignat Tolstorebrov , Armin Hafner , Trygve M. Eikevik

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Abstract

The aim of this study is to experimentally evaluate of brazed plate heat exchangers used as desorbers in absorption-compression heat pump systems, with a particular emphasis on recovering industrial waste heat applications. To reduce installation cost two vertical desorbers operating in different modes were experimentally investigated the overall heat transfer coefficient, using an ammonia-water mixture as the working fluid. To optimize the heat exchanger efficiency of plate type heat exchangers, an efficient design of desorber is an important factor in improving the performance of the system. The studied desorber system consists of two plate heat exchangers that are connected in series. The thermal performance of these units was analyzed under a constant heat source having an inlet temperature of 70 °C and a mass flux of 115 kg/m²⋅s. Experimental results revealed that, by varying the strong solution mass flux from 5 to 36 kg/m²⋅s, the following performance changes were observed in Desorber 1: heat load increased from 5 to 20 kW, the overall heat transfer coefficient improved from 1.1 to 1.7 kW/m²⋅K, and thermal efficiency increased from 66 % to 86 %. For Desorber 2, the heat load decreased from 17 kW to 14 kW, the heat transfer coefficient varied from 1.1 to 1.5 kW/m²⋅K, and thermal efficiency increased from 66 % to 80 %. Additionally, the vapor mass fraction at the outlet of Desorber 2 ranged from 0.1 to 0.6 kg/kg. The highest-pressure drop was recorded in Desorber 1. These results offer important insights for enhancing the design and functionality of desorber units in high-temperature heat pump systems, contributing to the development of more efficient and cost-effective solutions for industrial waste heat recovery.

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蒸汽吸收-压缩热泵氨/水混合解吸换热实验研究

本研究的目的是实验评估在吸收式压缩热泵系统中用作解吸器的钎焊板式换热器，特别强调回收工业废热的应用。为降低安装成本，以氨-水混合液为工质，对两种不同运行模式下的立式解吸塔的总换热系数进行了实验研究。为了优化板式换热器的换热效率，高效的解吸器设计是提高系统性能的重要因素。所研究的解吸器系统由两个串联的板式换热器组成。在进口温度为70℃、质量通量为115 kg/m²⋅s的恒定热源条件下，对这些装置的热性能进行了分析。实验结果表明，当强溶液质量通量从5 kg/m²·s增加到36 kg/m²·s时，脱渣器1的热负荷从5 kW增加到20 kW，总换热系数从1.1 kW/m²·K提高到1.7 kW/m²·K，热效率从66%提高到86%。解吸器2的热负荷从17 kW降低到14 kW，换热系数从1.1 ~ 1.5 kW/m²⋅K，热效率从66%提高到80%。解吸器2出口水蒸气质量分数在0.1 ~ 0.6 kg/kg之间。减压器1记录了最大的压降。这些结果为提高高温热泵系统中解吸器单元的设计和功能提供了重要的见解，有助于开发更有效和更具成本效益的工业废热回收解决方案。

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 Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer