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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2021-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0250583 |
| _version_ | 1819039256923865088 |
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| author | Hang Zou Peng Pei Chen Wang Dingyi Hao |
| author_facet | Hang Zou Peng Pei Chen Wang Dingyi Hao |
| author_sort | Hang Zou |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-21T08:50:19Z |
| format | Article |
| id | doaj.art-080fa325d8534f839dbc9a68ae217dc7 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-21T08:50:19Z |
| publishDate | 2021-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-080fa325d8534f839dbc9a68ae217dc72022-12-21T19:09:42ZengPublic Library of Science (PLoS)PLoS ONE1932-62032021-01-01165e025058310.1371/journal.pone.0250583A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps.Hang ZouPeng PeiChen WangDingyi HaoHorizontal 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.https://doi.org/10.1371/journal.pone.0250583 |
| spellingShingle | 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. PLoS ONE |
| title | 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_short | 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 |
| url | https://doi.org/10.1371/journal.pone.0250583 |
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