Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions
In recent years, factors influencing the heat transfer characteristics of the vertical borehole heat exchanger (BHE) is a hot topic in the research of the ground source heat pump (GSHP) systems. Given the complexities involved in environmental situations with respect to groundwater seepage in satura...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23001466 |
| _version_ | 1827986569464643584 |
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| author | Songqing Wang Yuxuan Ji Shijing He Jing Gao Yao Wang Xuelong Cai |
| author_facet | Songqing Wang Yuxuan Ji Shijing He Jing Gao Yao Wang Xuelong Cai |
| author_sort | Songqing Wang |
| collection | DOAJ |
| description | In recent years, factors influencing the heat transfer characteristics of the vertical borehole heat exchanger (BHE) is a hot topic in the research of the ground source heat pump (GSHP) systems. Given the complexities involved in environmental situations with respect to groundwater seepage in saturated soil and moisture migration in unsaturated soil, this paper examined the effects of various influencing factors on the heat transfer characteristics of the vertical BHE under stratified soil conditions, using theoretical research, experimental research, and numerical simulations. Subsequently, through altering five influencing factors—groundwater seepage velocity, porosity, saturation, thermal conductivity, and initial soil temperature—the working conditions of the vertical BHE under stratified soil conditions were established, and the heat transfer rate was calculated. The results showed that the weight of the influencing factors on the heat transfer characteristics of the vertical BHE had a descending order: thermal conductivity, groundwater seepage velocity, porosity, saturation, and initial soil temperature. These results can provide an important reference for further optimizing future BHE designs. |
| first_indexed | 2024-04-09T23:33:26Z |
| format | Article |
| id | doaj.art-d64922b3cd0a4998a21d795c4af68219 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-04-09T23:33:26Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-d64922b3cd0a4998a21d795c4af682192023-03-21T04:16:29ZengElsevierCase Studies in Thermal Engineering2214-157X2023-04-0144102840Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditionsSongqing Wang0Yuxuan Ji1Shijing He2Jing Gao3Yao Wang4Xuelong Cai5School of Civil Engineering, Northeast Forestry University, Harbin, 150040, China; Institute of Artificial Environment Control and Energy Application, Northeast Forestry University, Harbin, 150040, China; Corresponding author. School of Civil Engineering, Northeast Forestry University, Harbin, 150040, China.School of Civil Engineering, Northeast Forestry University, Harbin, 150040, China; Institute of Artificial Environment Control and Energy Application, Northeast Forestry University, Harbin, 150040, ChinaSchool of Civil Engineering, Northeast Forestry University, Harbin, 150040, China; Institute of Artificial Environment Control and Energy Application, Northeast Forestry University, Harbin, 150040, ChinaSchool of Civil Engineering, Northeast Forestry University, Harbin, 150040, China; Institute of Artificial Environment Control and Energy Application, Northeast Forestry University, Harbin, 150040, ChinaSchool of Civil Engineering, Northeast Forestry University, Harbin, 150040, China; Institute of Artificial Environment Control and Energy Application, Northeast Forestry University, Harbin, 150040, ChinaSchool of Civil Engineering, Northeast Forestry University, Harbin, 150040, China; Institute of Artificial Environment Control and Energy Application, Northeast Forestry University, Harbin, 150040, ChinaIn recent years, factors influencing the heat transfer characteristics of the vertical borehole heat exchanger (BHE) is a hot topic in the research of the ground source heat pump (GSHP) systems. Given the complexities involved in environmental situations with respect to groundwater seepage in saturated soil and moisture migration in unsaturated soil, this paper examined the effects of various influencing factors on the heat transfer characteristics of the vertical BHE under stratified soil conditions, using theoretical research, experimental research, and numerical simulations. Subsequently, through altering five influencing factors—groundwater seepage velocity, porosity, saturation, thermal conductivity, and initial soil temperature—the working conditions of the vertical BHE under stratified soil conditions were established, and the heat transfer rate was calculated. The results showed that the weight of the influencing factors on the heat transfer characteristics of the vertical BHE had a descending order: thermal conductivity, groundwater seepage velocity, porosity, saturation, and initial soil temperature. These results can provide an important reference for further optimizing future BHE designs.http://www.sciencedirect.com/science/article/pii/S2214157X23001466Stratified soilBorehole heat exchangerHeat transfer characteristicsInfluencing factors |
| spellingShingle | Songqing Wang Yuxuan Ji Shijing He Jing Gao Yao Wang Xuelong Cai Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions Case Studies in Thermal Engineering Stratified soil Borehole heat exchanger Heat transfer characteristics Influencing factors |
| title | Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions |
| title_full | Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions |
| title_fullStr | Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions |
| title_full_unstemmed | Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions |
| title_short | Analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions |
| title_sort | analysis on influencing factors of heat transfer characteristics of vertical borehole heat exchanger under stratified soil conditions |
| topic | Stratified soil Borehole heat exchanger Heat transfer characteristics Influencing factors |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X23001466 |
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