Development of a numerical model to predict heat exchange rates for a ground-source heat pump system
Development of a numerical model to predict heat exchange rates for a ground-source heat pump system
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DOI：
10.1016/j.enbuild.2008.06.004
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发表时间：
2008-01-01
影响因子：
6.7
通讯作者：
Hwang, Suckho
中科院分区：
文献类型：
--
作者：
Nam, Yujin;Ooka, Ryozo;Hwang, Suckho
土壤源热泵（GSHP）系统可以获得比传统空气源热泵（ASHP）系统更高的性能系数。对于地源热泵系统的设计，有必要准确地预测换热器的取热率和注热率。在暖通空调系统的研究领域中，已有许多将联合收割机与地下热传导相结合的模型被提出来预测从地下提取热量和向地下注入热量。然而，大多数分析模型是基于使用圆柱坐标模型或等效直径模型的热传导模型，因此在长时间内预测不准确。本文提出了一个将地下水热输运模型和具有精确形状的热交换器模型相结合的数值模型。此外，提出了一种基于地面调查的土壤性质估计方法。在2004年的实验条件下，对基于上述模型的数值分析和实验结果进行了比较。分析结果与实验结果吻合较好。最后，该模型被用来预测在日本的实际办公楼的热交换率。(C)2008 Elsevier B.V.保留所有权利。
Ground-source heat pump (GSHP) systems can achieve a higher coefficient of performance than conventional air-source heat pump (ASHP) systems. For the design of a GSHP system, it is necessary to accurately predict the heat extraction and injection rates of the heat exchanger. Many models that combine ground heat conduction and heat exchangers have been proposed to predict heat extraction/injection rates from/into the ground in the research field of heating, ventilation and air-conditioning systems. However, most analysis models are inaccurate in their predictions for long periods because they are based on a thermal conduction model using a cylindrical coordinate model or an equivalent diameter model. In this paper, a numerical model that combines a heat transport model with ground water flow and a heat exchanger model with an exact shape is developed. Furthermore, a method for estimating soil properties based on ground investigations is proposed. Comparison between experimental results and numerical analysis based on the model developed above was conducted under the conditions of an experiment from 2004. The analytical results agreed well with the experimental results. Finally, the proposed model was used to predict the heat exchange rate for an actual office building in Japan. (C) 2008 Elsevier B.V. All rights reserved.