Abstract
Recently, as a measure for global warming, zero energy building has become a major issue as a means of conserving energy and reducing carbon emission in the building. In this situation, the focus on renewable energy systems has intensified as well as ongoing technology development. Especially, the ground source heat pump system (GSHP) attains high efficiency by using the annual stable ground temperature. However, it is difficult to introduce it in small-scale buildings because of initial investment costs, such as excavation costs and the installation of the GSHP. In this study, the performance factors of the low-depth modular heat exchanger were reviewed for the development of the ground heat exchanger that is relatively inexpensive and can respond to small-scale buildings compared to the vertical type ground heat exchanger. Assuming an underground heat exchanger is installed in the ground, an analytical model was built and the circulating water temperature was calculated by using the CFD program. Additionally, to find out the factors affecting the performance of the low-depth ground heat exchanger, the prediction of heat exchange rate was performed.
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