Monitoring the heating energy performance of a heat wheel in a direct expansion air handling unit

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-10-31 DOI:10.1016/j.ijrefrig.2024.10.035

Miklos Kassai , Laith Al-Hyari

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引用次数: 0

Abstract

This study presents an on-site examination of the heating energy performance of a real ventilation system, running on the flat roof of a shopping complex building in Hungary. The main focus of this study is to delve into the heating energy efficiency of specific air handling elements, such as the air-to-air rotary heat wheel and the direct expansion heating coil supplied by a variable refrigerant volume outdoor unit under real operation conditions. Additionally, an investigation was carried out during the heating season to scrutinize the potential occurrence of CO₂ transfer from the exhaust airflow to the supply airflow within the heat wheel, which issue highlights a notable limitation of the heat recovery system. Based on the monitored and measured data, the energy saving impact of the heat wheel was 20.5 % on the electric power consumption of the variable refrigerant volume outdoor unit throughout the entire heating period, compared to operation without heat wheel. Furthermore, the relative average of CO₂ cross-contamination is recorded as 3.8 % in the investigated heating season.

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监测直接膨胀式空气处理机组中热轮的供热能效比

本研究介绍了对在匈牙利一座购物综合大楼平顶上运行的真实通风系统的供热能效进行的现场检测。本研究的重点是在实际运行条件下，深入研究特定空气处理元件的供热能效，如空气对空气旋转热轮和由变制冷量室外机提供的直接膨胀加热盘管。此外，还在供暖季节开展了一项调查，以仔细研究热轮内可能出现的二氧化碳从排气气流转移到送气气流的情况，这一问题凸显了热回收系统的显著局限性。根据监测和测量的数据，与不使用热轮的运行方式相比，热轮在整个采暖期对变制冷量室外机电能消耗的节能影响为 20.5%。此外，在调查的供暖季中，二氧化碳交叉污染的相对平均值为 3.8%。

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.