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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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2021-11-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2021.772977/full |
| _version_ | 1818997566392500224 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-20T21:47:40Z |
| format | Article |
| id | doaj.art-7079ca6fe28c402093e224d7a4ba7686 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-20T21:47:40Z |
| publishDate | 2021-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-7079ca6fe28c402093e224d7a4ba76862022-12-21T19:25:37ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-11-01910.3389/feart.2021.772977772977Study on the Long-Term Performance and Efficiency of Single-Well Circulation Coupled Groundwater Heat Pump System Based on Field TestKe Zhu0Ke Zhu1Yifan Zeng2Yifan Zeng3Qiang Wu4Qiang Wu5Shengheng Xu6Shengheng Xu7Kun Tu8Kun Tu9Xiaoxiu Liu10Xiaoxiu Liu11College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing, ChinaCollege of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing, ChinaCollege of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing, ChinaCollege of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing, ChinaCollege of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing, ChinaCollege of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, ChinaNational Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing, ChinaAlthough 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.https://www.frontiersin.org/articles/10.3389/feart.2021.772977/fullsingle-well circulationgroundwater heat pumpefficiencyenergy consumptioncoefficient of performance |
| spellingShingle | 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 Frontiers in Earth Science single-well circulation groundwater heat pump efficiency energy consumption coefficient of performance |
| title | 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_short | 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 |
| topic | single-well circulation groundwater heat pump efficiency energy consumption coefficient of performance |
| url | https://www.frontiersin.org/articles/10.3389/feart.2021.772977/full |
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