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Development of Simulation Tool for Ground Source Heat Pump Systems Influenced by Ground Surface

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Title: Development of Simulation Tool for Ground Source Heat Pump Systems Influenced by Ground Surface
Authors: Katsura, Takao Browse this author →KAKEN DB
Sakata, Yoshitaka Browse this author
Ding, Lan Browse this author
Nagano, Katsunori Browse this author →KAKEN DB
Keywords: ground source heat pump system
simulation tool
influence of ground surface
superposition theorem
Issue Date: Sep-2020
Publisher: MDPI
Journal Title: Energies
Volume: 13
Issue: 17
Start Page: 4491
Publisher DOI: 10.3390/en13174491
Abstract: The authors developed a ground heat exchanger (GHE) calculation model influenced by the ground surface by applying the superposition theorem. Furthermore, a simulation tool for ground source heat pump (GSHP) systems affected by ground surface was developed by combining the GHE calculation model with the simulation tool for GSHP systems that the authors previously developed. In this paper, the outlines of GHE calculation model is explained. Next, in order to validate the calculation precision of the tool, a thermal response test (TRT) was carried out using a borehole GHE with a length of 30 m and the outlet temperature of the GHE calculated using the tool was compared to the measured one. The relative error between the temperatures of the heat carrier fluid in the GHE obtained by measurement and calculation was 3.3% and this result indicated that the tool can reproduce the measurement with acceptable precision. In addition, the authors assumed that the GSHP system was installed in residential houses and predicted the performances of GSHP systems using the GHEs with different lengths and numbers, but the same total length. The result showed that the average surface temperature of GHE with a length of 10 m becomes approximately 2 degrees C higher than the average surface temperature of a GHE with a length of 100 m in August.
Rights: © [2020] by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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