Numerical simulation of the influence of karst topography on the heat transfer performance of buried pipe

The complex hydrogeological conditions in karst areas complicate the heat transfer mechanisms in buried pipe heat exchangers. This study examines the impact of geological factors on heat exchanger performance and the temperature field of rock-soil mass (RSM). Five factors—flow direction and velocity...

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Bibliographic Details
Published inInternational communications in heat and mass transfer Vol. 159; p. 108030
Main Authors Chen, Yaya, Mao, Ruiyong, Zou, Guangming, Chen, Jing, Zhou, Jiri, Chen, Cheng, Wang, Xiangyu, Zhang, Zujing
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2024
Subjects
Evaluation of performance
Groundwater seepage
GSHP
Numerical simulation
Thermal stacking
Thermal stacking
Numerical simulation
Evaluation of performance
Groundwater seepage
GSHP
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Summary:The complex hydrogeological conditions in karst areas complicate the heat transfer mechanisms in buried pipe heat exchangers. This study examines the impact of geological factors on heat exchanger performance and the temperature field of rock-soil mass (RSM). Five factors—flow direction and velocity of seepage (FDS and FVS), thickness of seepage layer (TSL), porosity of rock-soil mass (PRS), and inlet temperature (INT)—and four levels are selected. Using L16(45) orthogonal experiments, three performance indexes are evaluated: temperature difference between inlet and outlet (TDIO), heat exchange decay rate (HEDR), and thermal stacking rate (TSR). The GCGA algorithm scores each index comprehensively. Results show: (1) TDIO and TSR increase with INT; seepage benefits enhance heat transfer temperature difference by 14.2 % under the same INT; Higher TSL leads to a maximum TSR decrease of 33.01 % in the seepage zone's upper reaches under the same INT. (2) Increased seepage thickness amplifies its impact on heat transfer decay rate. (3) Key factors for TDIO, HEDR, and TSR are INT, TSL, and INT, respectively. These research findings can guide the design of GSHPs in regions with different hydrogeological conditions, based on the premise of enhancing the efficiency and operation duration of the system under continuous operation, thereby promoting the application of GSHPs.
ISSN:0735-1933
DOI:10.1016/j.icheatmasstransfer.2024.108030