Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental and numerical investigation on heat transfer characteristics of vertical ground heat exchangers in karst areas
Highlights Seepage can promote the temperature field around GHEs to reach the steady faster. Seepage effects on temperature field around GHEs increases with seepage velocity. Seepage will reduce the accumulation of heat around the heat exchangers. Ground stratification effects on temperature field around GHEs depends on the thermal property of adjacent stratum.
Abstract Heat transfer between the ground heat exchanger and surrounding stratum under the action of groundwater seepage is a potential problem in karst areas, few systematic studies on it have been carried out yet. A model test apparatus was built to experimentally investigate the effects of karst groundwater seepage and ground stratification on the heat transfer characteristics of ground heat exchangers. The heat and seepage transfer coupling model for ground heat exchangers was established, and verified with the measured data from the model test. Base on the model, the influence of seepage velocity and direction on the heat transfer of ground heat exchangers was analyzed and discussed. Test results show that the seepage can promote the temperature field around the heat exchanger to reach the steady state faster, and the influence of seepage on the soil temperature field around the heat exchanger increases with increasing the seepage velocity. The seepage will carry the heat released by the heat exchanger from the upstream side to the downstream, which effectively reduce the accumulation of heat around the heat exchanger. Soil boundary exists the sudden change of temperature when there are great differences in thermal properties between adjacent soil layers, which can be attributed to the influence of ground stratification. The numerical model proposed in this study can well predict the distribution of soil temperature field around heat exchangers in the model test. Simulation results show that the temperature of soil around the heat exchanger will change along the seepage direction.
Experimental and numerical investigation on heat transfer characteristics of vertical ground heat exchangers in karst areas
Highlights Seepage can promote the temperature field around GHEs to reach the steady faster. Seepage effects on temperature field around GHEs increases with seepage velocity. Seepage will reduce the accumulation of heat around the heat exchangers. Ground stratification effects on temperature field around GHEs depends on the thermal property of adjacent stratum.
Abstract Heat transfer between the ground heat exchanger and surrounding stratum under the action of groundwater seepage is a potential problem in karst areas, few systematic studies on it have been carried out yet. A model test apparatus was built to experimentally investigate the effects of karst groundwater seepage and ground stratification on the heat transfer characteristics of ground heat exchangers. The heat and seepage transfer coupling model for ground heat exchangers was established, and verified with the measured data from the model test. Base on the model, the influence of seepage velocity and direction on the heat transfer of ground heat exchangers was analyzed and discussed. Test results show that the seepage can promote the temperature field around the heat exchanger to reach the steady state faster, and the influence of seepage on the soil temperature field around the heat exchanger increases with increasing the seepage velocity. The seepage will carry the heat released by the heat exchanger from the upstream side to the downstream, which effectively reduce the accumulation of heat around the heat exchanger. Soil boundary exists the sudden change of temperature when there are great differences in thermal properties between adjacent soil layers, which can be attributed to the influence of ground stratification. The numerical model proposed in this study can well predict the distribution of soil temperature field around heat exchangers in the model test. Simulation results show that the temperature of soil around the heat exchanger will change along the seepage direction.
Experimental and numerical investigation on heat transfer characteristics of vertical ground heat exchangers in karst areas
Xu, Yunshan (Autor:in) / Zeng, Zhaotian (Autor:in) / Sun, De'an (Autor:in)
Energy and Buildings ; 275
12.09.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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