A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.

Horizontal ground heat exchangers (HGHEs) have advantages such as convenient construction and low cost; however, their application and popularization are restricted owing to traditional linear HGHEs occupying large space and presenting low total heat transfer capacity. Spiral-coil and slinky-coil HG...

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Autores principales:	Hang Zou, Peng Pei, Chen Wang, Dingyi Hao
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/080fa325d8534f839dbc9a68ae217dc7
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spelling	oai:doaj.org-article:080fa325d8534f839dbc9a68ae217dc72021-12-02T20:05:33ZA numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.1932-620310.1371/journal.pone.0250583https://doaj.org/article/080fa325d8534f839dbc9a68ae217dc72021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0250583https://doaj.org/toc/1932-6203Horizontal ground heat exchangers (HGHEs) have advantages such as convenient construction and low cost; however, their application and popularization are restricted owing to traditional linear HGHEs occupying large space and presenting low total heat transfer capacity. Spiral-coil and slinky-coil HGHEs have been proposed, but currently a comprehensive comparison and evaluation for these types of HGHEs are still needed. In this study, a three-dimensional heat transfer model of the three types of HGHEs for ground source heat pumps (GSHPs) was established. Based on the simulation results, the long-term heat transfer performances were investigated, including the temperature field of surrounding energy-storage soils, outlet working fluid temperature, coefficient of performance (COP) of units, and surplus temperature of the energy-storage soils. A new concept named heat transfer capacity per heat-affected area was proposed in this paper. It is found that the spiral-coil HGHEs have the best performances in terms of working-fluid outlet temperature, unit COP, total heat transfer capacity, heat transfer rate heat-affected area. The linear HGHEs shows the best performances in terms of mitigating heat imbalance risk and heat transfer rate per length. The results provide a reliable basis for selection of HGHE types in engineering practice and improvement guide in the future.Hang ZouPeng PeiChen WangDingyi HaoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 5, p e0250583 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hang Zou Peng Pei Chen Wang Dingyi Hao A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.
description	Horizontal ground heat exchangers (HGHEs) have advantages such as convenient construction and low cost; however, their application and popularization are restricted owing to traditional linear HGHEs occupying large space and presenting low total heat transfer capacity. Spiral-coil and slinky-coil HGHEs have been proposed, but currently a comprehensive comparison and evaluation for these types of HGHEs are still needed. In this study, a three-dimensional heat transfer model of the three types of HGHEs for ground source heat pumps (GSHPs) was established. Based on the simulation results, the long-term heat transfer performances were investigated, including the temperature field of surrounding energy-storage soils, outlet working fluid temperature, coefficient of performance (COP) of units, and surplus temperature of the energy-storage soils. A new concept named heat transfer capacity per heat-affected area was proposed in this paper. It is found that the spiral-coil HGHEs have the best performances in terms of working-fluid outlet temperature, unit COP, total heat transfer capacity, heat transfer rate heat-affected area. The linear HGHEs shows the best performances in terms of mitigating heat imbalance risk and heat transfer rate per length. The results provide a reliable basis for selection of HGHE types in engineering practice and improvement guide in the future.
format	article
author	Hang Zou Peng Pei Chen Wang Dingyi Hao
author_facet	Hang Zou Peng Pei Chen Wang Dingyi Hao
author_sort	Hang Zou
title	A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.
title_short	A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.
title_full	A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.
title_fullStr	A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.
title_full_unstemmed	A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.
title_sort	numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/080fa325d8534f839dbc9a68ae217dc7
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A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.

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