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Technical Brief

Numerical Simulations of a Ground Source Heat Pump System With Pile Heat Exchangers

[+] Author and Article Information
Masahito Oguma

Department of Mechanical Engineering,
College of Engineering,
Nihon University,
1 Nakagawara, Tokusada,
Tamura-machi, Koriyama 963-8642, Japan
e-mail: oguma@mech.ce.nihon-u.ac.jp

Takeshi Matsumoto

Department of Mechanical Engineering,
College of Engineering,
Nihon University,
1 Nakagawara, Tokusada,
Tamura-machi, Koriyama 963-8642, Japan
e-mail: matsu@mech.ce.nihon-u.ac.jp

Takao Kakizaki

Department of Mechanical Engineering,
College of Engineering,
Nihon University,
1 Nakagawara, Tokusada,
Tamura-machi, Koriyama 963-8642, Japan
e-mail: kakizaki@mech.ce.nihon-u.ac.jp

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received October 25, 2013; final manuscript received August 5, 2014; published online September 16, 2014. Assoc. Editor: Hongbin Ma.

J. Thermal Sci. Eng. Appl 7(1), 014501 (Sep 16, 2014) (5 pages) Paper No: TSEA-13-1187; doi: 10.1115/1.4028343 History: Received October 25, 2013; Revised August 05, 2014

Feasibility of a ground source heat pump (GSHP) system with pile heat exchangers for use in houses is evaluated through a numerical simulation. This GSHP system differs from ordinary borehole-type GSHP systems because short foundation piles installed at close intervals are used as heat exchangers. It is shown that the annual heat supply provided by this GSHP system is able to satisfy the demand of a house due to the air-source exchange at ground surface.

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References

Figures

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Fig. 1

Schematic of a pile heat exchanger

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Fig. 2

Example of a foundation steel pipe pile arrangement for a house

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Fig. 3

Upper view and arrangement of a pile heat exchangers with TUMs. (a) Upper view of a TUM and (b) arrangement of TUMs for the example shown in Fig. 2.

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Fig. 4

Side view of the TUM

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Fig. 5

Schematic of a thermal model of a pile heat exchanger

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Fig. 6

Effects of thermal diffusivities on the annual underground temperature profiles and measurement results with the heat penetration model

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Fig. 7

Monthly demand on heat exchange piles with corresponding to COP of a heat pump

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Fig. 8

Calculated results in a case with the adiabatic ground surface

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Fig. 9

Calculated results in a case with the exposed ground surface

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