TY - JOUR
T1 - Subsurface utilization as a heat sink for large-scale ground source heat pump
T2 - Case study in Bangkok, Thailand
AU - Shimada, Yutaro
AU - Tokimatsu, Koji
AU - Asawa, Takashi
AU - Uchida, Youhei
AU - Tomigashi, Akira
AU - Kurishima, Hideaki
N1 - Funding Information:
We express our sincere thanks to Prof. Damien David at INSA de Lyon and Prof. Tomohiko Ihara at the University of Tokyo for raising a scientific question and giving an insightful discussion. We also thank Mr. Poj Hansirisawat at TAIST Tokyo Tech for searching for the official documents regarding Thailand’ s Building Energy Code and assisting with translation. This work was supported by JSPS KAKENHI Grant Number JP21J13612 .
Funding Information:
We express our sincere thanks to Prof. Damien David at INSA de Lyon and Prof. Tomohiko Ihara at the University of Tokyo for raising a scientific question and giving an insightful discussion. We also thank Mr. Poj Hansirisawat at TAIST Tokyo Tech for searching for the official documents regarding Thailand? s Building Energy Code and assisting with translation. This work was supported by JSPS KAKENHI Grant Number JP21J13612.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/12
Y1 - 2021/12
N2 - 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.
AB - 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.
KW - Energy saving
KW - Ground source heat pump
KW - Tropical region
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U2 - 10.1016/j.renene.2021.08.116
DO - 10.1016/j.renene.2021.08.116
M3 - Article
AN - SCOPUS:85114695962
SN - 0960-1481
VL - 180
SP - 966
EP - 979
JO - Renewable Energy
JF - Renewable Energy
ER -