Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test

Although buildings are often heated and cooled by single-well circulation coupled groundwater heat pump systems, few studies have evaluated the long-term performance of these systems. Therefore, the present study investigated the performance of these systems by analyzing the efficiency and energy co...

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Autores principales:	Ke Zhu, Yifan Zeng, Qiang Wu, Shengheng Xu, Kun Tu, Xiaoxiu Liu
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	single-well circulation groundwater heat pump efficiency energy consumption coefficient of performance Science Q
Acceso en línea:	https://doaj.org/article/7079ca6fe28c402093e224d7a4ba7686
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spelling	oai:doaj.org-article:7079ca6fe28c402093e224d7a4ba76862021-12-01T07:32:45ZStudy on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test2296-646310.3389/feart.2021.772977https://doaj.org/article/7079ca6fe28c402093e224d7a4ba76862021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.772977/fullhttps://doaj.org/toc/2296-6463Although buildings are often heated and cooled by single-well circulation coupled groundwater heat pump systems, few studies have evaluated the long-term performance of these systems. Therefore, the present study investigated the performance of these systems by analyzing the efficiency and energy consumption using 4 years of operating data. The results indicate that the coefficient of performance (COP) of the system gradually decreases because of thermal breakthrough or an accumulation of cold. In addition, the sealing clapboards could effectively slow down thermal breakthrough. In addition, compared with the heating period, the COP of the heat pump unit (HPU) and system increases, and its energy consumption decreases in the cooling period. It was also found that partial heat loss occurs when water from the single-well circulation outlet penetrates the main pipeline. Moreover, the heat-exchange efficiency of a single HPU exceeds that of multiple HPUs, and the COP of a HPU decreases during operation with increasing indoor temperature. Accordingly, we improved the performance of system by increasing the underground heat storage. Herein, we focus on optimizing the system design during long-term operation, which includes taking steps such as lengthening the sealing clapboards, using insulated pipes, discharging the remaining water and adding intelligent control devices.Ke ZhuKe ZhuYifan ZengYifan ZengQiang WuQiang WuShengheng XuShengheng XuKun TuKun TuXiaoxiu LiuXiaoxiu LiuFrontiers Media S.A.articlesingle-well circulationgroundwater heat pumpefficiencyenergy consumptioncoefficient of performanceScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	single-well circulation groundwater heat pump efficiency energy consumption coefficient of performance Science Q
spellingShingle	single-well circulation groundwater heat pump efficiency energy consumption coefficient of performance Science Q Ke Zhu Ke Zhu Yifan Zeng Yifan Zeng Qiang Wu Qiang Wu Shengheng Xu Shengheng Xu Kun Tu Kun Tu Xiaoxiu Liu Xiaoxiu Liu Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test
description	Although buildings are often heated and cooled by single-well circulation coupled groundwater heat pump systems, few studies have evaluated the long-term performance of these systems. Therefore, the present study investigated the performance of these systems by analyzing the efficiency and energy consumption using 4 years of operating data. The results indicate that the coefficient of performance (COP) of the system gradually decreases because of thermal breakthrough or an accumulation of cold. In addition, the sealing clapboards could effectively slow down thermal breakthrough. In addition, compared with the heating period, the COP of the heat pump unit (HPU) and system increases, and its energy consumption decreases in the cooling period. It was also found that partial heat loss occurs when water from the single-well circulation outlet penetrates the main pipeline. Moreover, the heat-exchange efficiency of a single HPU exceeds that of multiple HPUs, and the COP of a HPU decreases during operation with increasing indoor temperature. Accordingly, we improved the performance of system by increasing the underground heat storage. Herein, we focus on optimizing the system design during long-term operation, which includes taking steps such as lengthening the sealing clapboards, using insulated pipes, discharging the remaining water and adding intelligent control devices.
format	article
author	Ke Zhu Ke Zhu Yifan Zeng Yifan Zeng Qiang Wu Qiang Wu Shengheng Xu Shengheng Xu Kun Tu Kun Tu Xiaoxiu Liu Xiaoxiu Liu
author_facet	Ke Zhu Ke Zhu Yifan Zeng Yifan Zeng Qiang Wu Qiang Wu Shengheng Xu Shengheng Xu Kun Tu Kun Tu Xiaoxiu Liu Xiaoxiu Liu
author_sort	Ke Zhu
title	Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test
title_short	Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test
title_full	Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test
title_fullStr	Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test
title_full_unstemmed	Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test
title_sort	study on the long-term performance and efficiency of single-well circulation coupled groundwater heat pump system based on field test
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/7079ca6fe28c402093e224d7a4ba7686
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Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field Test

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