Subsurface utilization as a heat sink for large-scale ground source heat pump: Case study in Bangkok, Thailand

RENEWABLE ENERGY

卷:180

Article

Shimada, Yutaro¹  Tokimatsu, Koji¹  Asawa, Takashi¹  Uchida, Youhei²  Tomigashi, Akira²  Kurishima, Hideaki³ 

[1] Tokyo Inst Technol, Sch Environm & Soc, Midori Ku, 4259 Nagatsuta Cho, Yokohama, Kanagawa 2268503, Japan

[2] Natl Inst Adv Ind Sci & Technol, Renewable Energy Res Ctr, 2-2-9 Machiikedai, Koriyama, Fukushima 9630298, Japan

[3] Shibaura Inst Technol, Sch Architecture, Koto Ku, 3-7-5 Toyosu, Tokyo 1358548, Japan

关键词: Ground source heat pump;    Energy saving;    Tropical region;   

DOI  :  10.1016/j.renene.2021.08.116

来源: Elsevier

【 摘 要 】

Subsurface utilization in the tropical regions as a heat sink for ground source heat pumps (GSHPs) leads to thermal buildup in the long term, resulting in the decreased energy performance. However, the applicability of the GSHP in these regions has never been investigated based on the predicted heat sink temperature over a lifetime. This study aimed to evaluate the energy performance of a large-scale GSHP system in representative building models in Thailand based on operating conditions derived from a predicted 50-year heat sink temperature. The proposed system combines a GSHP and an air-source heat pump (ASHP), and, in one scenario, the GSHP also supplies hot water. The results confirm that the combined system achieves a higher efficiency than that of an ASHP system alone, and GSHP supplying hot water realizes substantial energy-saving. However, limitations on the annual GSHP operation hours are essential, resulting in low energy-saving performance for cooling dominated facilities. Further improvements are expected by mitigating the thermal interactions among each borehole heat exchanger. (c) 2021 Elsevier Ltd. All rights reserved.

【 授权许可】

Free