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Takao Katsura, Ph.D., Hokkaido University
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Katsunori Nagano, Ph.D., Hokkaido University
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Yasushi Nakamura, Ph.D., Nippon Steel & Sumikin Engineering
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The heat recovery ground source heat pump (HR-GSHP) system that has several types of GSHPs for different uses connected in the ground heat exchangers yields two types of heat recovery effects. The first one is the direct heat recovery effect obtained by operating the several types of GSHPs. The second one is the indirect heat recovery effect that utilizes the underground thermal storage effects and is brought by alternately operating the several types of GSHPs in the short term. By utilizing these two effects, the HR-GSHP can yield both energy saving effect and drastic reduction of the ground heat exchanger’s total length. This paper investigates the design and operation method of the HR-GSHP system.
