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An integrated predictive model of the long-term performance of ground source heat pump (GSHP) systems

机译:地源热泵(GSHP)系统长期性能的集成预测模型

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This study presents an integrated predictive model for the long-term performance assessment of ground source heat pump (GSHP) systems, which comprehensively considers the dynamic heat loads of the buildings and heat pump units (HPUs), the 3D dynamic heat transfer process in the ground heat exchangers (GHEs) and the energy consumption by the system accessories particularly the pumps. The model achieved significantly improved predictions than the conventional models and was in satisfactory agreement with the field-test data of an in-operation GSHP system, demonstrating the importance of systematic consideration of the dynamic system operational characteristics and 3D heat transfer processes in the GHEs. The model was also utilized to analyse the performance degradation of GSHP system induced by the soil thermal imbalance. It was found that increasing the thermal imbalance ratio of the accumulative building load from 35% to 76% led to a 10.7 degrees C further increase in GHE outlet water temperature, a half-folded cooling COP of the HPU and a shorter life-span. (C) 2017 Elsevier B.V. All rights reserved.
机译:这项研究为地源热泵(GSHP)系统的长期性能评估提供了一个集成的预测模型,该模型综合考虑了建筑物和热泵单元(HPU)的动态热负荷,即3D动态传热过程。地面热交换器(GHE)以及系统附件(尤其是泵)的能耗。与常规模型相比,该模型的预测效果得到了显着改善,并且与运行中的GSHP系统的现场测试数据相符,表明了在GHE中系统地考虑动态系统运行特性和3D传热过程的重要性。该模型还用于分析土壤热失衡引起的GSHP系统性能下降。已发现,将建筑物累计负荷的热失衡比从35%增加到76%会导致GHE出口水温度进一步升高10.7摄氏度,HPU的冷却COP降低一半,并且使用寿命缩短。 (C)2017 Elsevier B.V.保留所有权利。

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