Experimental and numerical investigation of heat transfer performance and sustainability of deep borehole heat exchangers coupled with ground source heat pump systems
Experimental and numerical investigation of heat transfer performance and sustainability of deep borehole heat exchangers coupled with ground source heat pump systems
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深埋管换热器与地源热泵系统相结合的传热性能和可持续性的实验和数值研究
DOI：
10.1016/j.applthermaleng.2018.12.094
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发表时间：
2019-02
影响因子：
6.4
通讯作者：
Ma Zhenjun
中科院分区：
文献类型：
--
作者：
Cai Wanlong;Wang Fenghao;Liu Jun;Wang Zhihua;Ma Zhenjun
深孔换热器是一种先进可行的建筑采暖和可再生能源利用装置。传统的长时间运行的BHES可能会出现显著的性能下降，DBHE可能会提供一种解决这一问题的替代方法。本文建立了考虑轴向地温梯度和岩土多层热物性的数值模型，并用该模型模拟了同轴DBHEs的温度分布和性能特性。通过一个示范项目收集的实验数据验证了模型的有效性。结果表明，模拟结果与实验数据吻合较好。与传统的BHES相比，DBHEs可以提供更高的换热能力。在间歇运行10 年中，4种不同运行方式下运行时间与停机时间之比分别为8：16、12：12、16：8和24：0时，出口温度下降的比例均不超过3.57%。给出了商业建筑和住宅建筑采暖方式下的岩石温度分布，年降幅均小于4.0%。研究结果可为不同工况、不同运行方式下DBHEs的可持续性研究提供参考。
Deep borehole heat exchangers (DBHEs) are a state-of-the-art and feasible apparatus for building heating and renewable energy utilization. Conventional BHEs with long-term operation may experience notable performance degradation, DBHE may provide an alternative way to overcome this issue. In this paper, a numerical model was developed by considering the ground temperature gradient in the axial direction and multilayer thermal properties of rock and soil and was used to simulate the temperature distribution and the performance characteristics of coaxial DBHEs. The effectiveness of the model was validated against the experimental data collected from a demonstration project. It was shown that the simulation results agreed well with the experimental data. The DBHEs could offer a higher heat exchange capacity in comparison to conventional BHEs. In the intermittent operation for 10 years, the decreasing proportions of the outlet temperature under four different operation modes with the run-stop ratio (i.e. the ratio of the running time to the stopping time in a day) of 8:16, 12:12, 16:8 and 24:0, were no more than 3.57%. The rock temperature profiles in the heating mode of both commercial and residential buildings were presented and the annual decreasing proportions were less than 4.0%. The findings obtained from this study could be used as a reference for sustainability research of DBHEs under different working conditions and operation modes.
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发表时间：
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影响因子：
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