Heat Transfer Modeling on High-Temperature Charging and Discharging of Deep Borehole Heat Exchanger with Transient Strong Heat Flux

被引:1
|
作者
Zhao, Yazhou [1 ,2 ]
Qin, Xiangxi [3 ,4 ]
Shi, Xiangyu [5 ]
机构
[1] Zhejiang Univ, Inst Refrigerat & Cryogen, Hangzhou 310027, Peoples R China
[2] Zhejiang Key Lab Clean Energy & Carbon Neutral, Hangzhou 310027, Peoples R China
[3] Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
[4] Lily Grp Co Ltd, Hangzhou 311228, Peoples R China
[5] Zhejiang Univ, Coll Energy Engn, Hangzhou 310027, Peoples R China
基金
中国国家自然科学基金;
关键词
deep borehole heat exchanger; heat transfer model; charging and discharging; strong heat flux; high efficiency; THERMAL-ENERGY STORAGE; FIELD-TEST; PERFORMANCE; SYSTEM; SIMULATION; DESIGN;
D O I
10.3390/su14159702
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
High-temperature charging and discharging by deep borehole heat exchanger is typical of a large heat exchange temperature difference and transient strong heat flux. Simulation of this problem is not only computationally expensive, but it is also challenging in terms of robustness and stability for numerical methods. This paper formulates a generic and efficient heat transfer model with two distinctive novelties: Firstly, it highlights unsteady- and quasi-steady-state modeling strategies for heat transfer outside and inside a borehole. Secondly, this model provides analytical solutions for the heat front propagation and heat flux density distribution for unsteady-state heat transfer in the rock zone. These analytical formulations prove to be generic and critical to relieve computational effort in the face of strong heat flux. This model is validated by a typical high-temperature heat storage case from the literature, as well as the pilot demonstration project in China. It was discovered that a large prediction error of the heat transfer model only exists in very short operation days during the initial unsteady stages of charging and discharging. Both relative errors under charging and discharging phases are within 5% during the steady-state period. A comparison of the simulation cost with OpenGeoSys software demonstrates its high efficiency. It proves that this heat transfer model achieves an acceleration ratio of 30 times relative to the fully numerical method. In general, the heat transfer model has four advantages: generic applicability, good accuracy, easy implementation, and high efficiency, but it is limited to the heat transfer of a single deep borehole heat exchanger under pure heat conduction.
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收藏
页数:34
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