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Matteo Dongellini, Christian Natale, Claudia Naldi, Eugenia Rossi di Schio, Paolo Valdiserri and Gian Luca Morini
An energy and environmental performance analysis of air-source and ground-source heat pump systems able to operate with traditional (R-410A) and alternative low-GWP (R-454B) refrigerants is conducted. The case study is composed of an existing residential...
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Pengxuan Wang, Yixi Wang, Weijun Gao, Tongyu Xu, Xindong Wei, Chunyan Shi, Zishu Qi and Li Bai
In cold regions, due o the impact of climatic conditions, the heat load in winter and the cooling load in summer are unbalanced. In the long-term operation of the ground-source heat pump (GSHP), the soil heat imbalance phenomenon has still not been succe...
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Mingxing Cao, Yimin Zhang and Tianfei Hu
This study aimed to investigate the practical applications of a ground source heat pump (GSHP) system for heating applications in embankment engineering. A special direct-expansion GSHP (DE-GSHP) was designed and manufactured, and its performance was exp...
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Mohamed Ghorab, Libing Yang, Evgueniy Entchev, Euy-Joon Lee, Eun-Chul Kang, Yu-Jin Kim, Sangmu Bae, Yujin Nam and Kwonye Kim
Hybrid renewable energy systems are subject to extensive research around the world and different designs have found their way to the market and have been commercialized. These systems usually employ multiple components, both renewable and conventional, c...
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Yoshitaka Sakata, Takao Katsura and Katsunori Nagano
This study determined the required lengths of borehole heat exchangers (BHEs) in ground-source heat pump systems for heating/cooling a building (with 300 m2 of floor area) across Japan?s four main islands through a simulation approach. Hourly thermal loa...
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Adel Eswiasi and Phalguni Mukhopadhyaya
Use of ground source heat pumps has increased significantly in recent years for space heating and cooling of residential houses and commercial buildings, in both heating (i.e., cold region) and cooling (i.e., warm region) dominated climates, due to its l...
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Yong-Dae Jeong, Min Gyung Yu and Yujin Nam
Renewable energy systems have received a lot of attention as sustainable technology in building sector. However, the efficiency of the renewable energy systems depends on the surrounding conditions, and it could gradually decrease by excessive and long-t...
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Yoshitaka Sakata, Takao Katsura, Katsunori Nagano and Manabu Ishizuka
Heat advection caused by groundwater flow can potentially improve the performance of a borehole heat exchanger. However, the required flow velocity is not achieved under most natural conditions. This study focuses on artificial groundwater flow generated...
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Jeong-Heum Cho, Yujin Nam and Hyoung-Chan Kim
Deep geothermal heat pump systems have considerable energy saving potential for heating and cooling systems that use stable ground temperature and groundwater as their heat sources. However, deep geothermal systems have several limitations for real appli...
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