Heat advection by groundwater flow is known to improve the performance of ground heat exchangers (GHEs), but the effect of groundwater advection on performance is not yet fully understood. This study examined how parameters related to groundwater flow, such as aquifer thickness, porosity, lithology, and groundwater flow velocity, affect the performance of a borehole GHE. Under the thin-aquifer condition (10 m, or 10% of the entire GHE length in this study), groundwater flow velocity had the greatest effect on heat flux. With a groundwater flow velocity of at least 10−4 m/s through a low-porosity aquifer filled with gravel with high thermal conductivity, the heat flux of a GHE was as much as 60% higher than that of a non-aquifer GHE. If the aquifer is as thick as 50 m (50% of the entire GHE length), the high thermal conductivity of gravel doubled the heat flux of the GHE with a groundwater flow velocity of at least 10−5 m/s. Thus, not only groundwater flow velocity, but also aquifer thickness and thermal conductivity were important factors. However, groundwater seldom flows at such high velocities, and porosity, gravel size, and aquifer thickness vary regionally. Thus, in the design of ground source heat pump systems, it is not appropriate to assume a large groundwater effect.
ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis
July 25–27, 2014
Copenhagen, Denmark
Conference Sponsors:
- International
ISBN:
978-0-7918-4585-1
PROCEEDINGS PAPER
The Effects of Groundwater Flow on Vertical-Borehole Ground Source Heat Pump Systems
Ayako Funabiki
,
Ayako Funabiki
Nihon University, Koriyama, Fukushima, Japan
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Masahito Oguma
,
Masahito Oguma
Nihon University, Koriyama, Fukushima, Japan
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Taisei Yabuki
,
Taisei Yabuki
Nihon University, Koriyama, Fukushima, Japan
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Takao Kakizaki
Takao Kakizaki
Nihon University, Koriyama, Fukushima, Japan
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Author Information
Ayako Funabiki
Nihon University, Koriyama, Fukushima, Japan
Masahito Oguma
Nihon University, Koriyama, Fukushima, Japan
Taisei Yabuki
Nihon University, Koriyama, Fukushima, Japan
Takao Kakizaki
Nihon University, Koriyama, Fukushima, Japan
Paper No:
ESDA2014-20065, V003T12A005; 9 pages
Published Online:
October 23, 2014
Citation
Funabiki, Ayako, Oguma, Masahito, Yabuki, Taisei, and Kakizaki, Takao. "The Effects of Groundwater Flow on Vertical-Borehole Ground Source Heat Pump Systems." Proceedings of the ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. Volume 3: Engineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics. Copenhagen, Denmark. July 25–27, 2014. V003T12A005. ASME. https://doi.org/10.1115/ESDA2014-20065
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