Impact of long-term operation of ground-source heat pump on subsurface thermal state in urban areas
Impact of long-term operation of ground-source heat pump on subsurface thermal state in urban areas
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DOI：
10.1016/j.scs.2017.12.036
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发表时间：
2018-04
影响因子：
11.7
通讯作者：
W. Choi;R. Ooka;Y. Nam
中科院分区：
文献类型：
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作者：
W. Choi;R. Ooka;Y. Nam
土壤源热泵在负荷不平衡条件下长期运行会导致热积累或热耗尽，从而导致性能下降。此外，在建筑物密度相当高的城市地区，建筑工地彼此非常接近，可能会出现热侵入问题。在假设地源热泵用于城市中所有建筑物具有相同的冷却主导负荷条件下，我们评估了地源热泵的长期运行对地下热状态的影响。采用建筑物模拟与数值埋管换热器（BHE）模型相结合的耦合模拟方案，在BHE的冷负荷为热负荷的2倍的条件下，对地源热泵10年的运行情况进行了模拟。在数值模型中，顶部和底部的轴向传热被显式地考虑;地面热平衡模型被集成到数值模型中作为地面边界条件，以真实地检查地下热行为。结果表明，详细考虑表面边界条件在长期模拟中起着重要作用。此外，根据研究结果，讨论了城市地区未来可能出现的问题。
Long-term operation of a ground-source heat pump (GSHP) under a load imbalance condition can lead to thermal buildup or depletion; consequently, this results in performance degradation. In addition, in urban areas where building densities are considerably high with building sites in close proximity to each other, thermal intrusion problems can occur. Under the assumption that GSHPs are used in all the buildings in a city with the same cooling dominant load condition, we assessed the effect of the long-term operation of a GSHP on the subsurface thermal state. Using a coupled simulation scheme that combined a building simulation and numerical borehole heat exchanger (BHE) model, ten years of GSHP operation was simulated under the condition that the cooling load assigned to a BHE is twice the heating load. In the numerical model, the top and bottom axial heat transfer was explicitly considered; a ground heat balance model was integrated into the numerical model as a ground surface boundary condition to examine subsurface thermal behavior realistically. Results showed that detailed consideration of the surface boundary condition plays an important role in a long-term simulation. Moreover, based on the results, possible future problems that may occur in an urban area were discussed.