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Experiments Using Capillary Mat as Ground Heat Exchanger for Ground Source Heat Pump Heating Application

Energy and Power Engineering 2019年第11期11卷 363-378页

作者： Arif Widiatmojo shrestha gaurav Takeshi Ishihara Akira Tomigashi Kasumi Yasukawa Youhei Uchida Shohei Kaneko Mayumi Yoshioka Renewable Research Center National Institute of Advanced Industrial Science and Technology Koriyama Japan Japan Oil Gas and Metals National Corporation (JOGMEC) Tokyo Japan

The cooling and heating of spaces are among the largest sources for household’s energy demand. Ground Source Heat Pump (GSHP) is a promising technology to reduce the energy for cooling and heating purposes. However, the major obstacle hindering the utilization of this technology is the high initial cost, especially for the installation of ground coupled heat exchanger. The horizontal closed-loop system offers lower installation cost, as it requires no vertical borehole construction. Instead, the heat exchangers can be installed in shallow trenches that may be excavated, by small excavator or even by human labor. This paper presents the comparison of two different heat exchangers, namely, the capillary mat and the widely used slinky pipe. Both heat exchangers are connected to a heat pump, where continuous heating tests were carried out for 165 hours (~7 days) for each configuration. The purpose of this research is to show the performance of capillary mat in comparison to slinky pipe. Despite during the entire test for capillary mat required 6% higher electricity consumption, compared to slinky heat exchanger, the results still suggest the potential use of capillary mat as alternative to slinky heat exchanger. Additionally, the results also highlight the high hydraulic resistance of installed capillary mat heat exchangers may become the major disadvantage of the capillary mat.

关键词： Horizontal Heat Exchanger Ground Source Heat Pump Capillary Mat

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