Heat exchanger performance of ground source heat
pump by water cooling method
Accepted 30th
May, 2018
Shuhei Ishiguro and Tetsuaki
Takeda*
Graduate School of Engineering, Dept. of Mechanical Engineering, University of
Yamanashi 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan
A ground source heat pump (GSHP)
is one of the saving energy systems for air
conditioning. However, the GSHP is not so
popular in Japan because its initial cost is
higher than an air source heat pump. This study
describes the thermal performance of the GSHP
using a water cooling method. An experimental
apparatus consists of a commercialized water
cooling heat pump, an underground heat
exchanger, and existing wells. Heat from a
refrigerant in an outdoor unit will be
transferred to the circulating water, and
finally, the heat will be transferred to an
underground water by an underground heat
exchanger. There is aquifer at over 6 m depth.
This system uses the existing two wells. The
depth of the wells are 40 and 30 m. The
underground heat exchanger was inserted into the
well having 40 m depth. A water pump was
inserted into the well having 30 m depth. Water
feeds to 38 m depth of the underground heat
exchanger by the water pump. This pump is used
to recover the temperature of underground by
feeding water. In this study, a value of
coefficient of performance (COP) of the proposed
system was obtained. The value of COP of the
cooling operation was 3.1~3.3 and that of the
heating operation was 2.5~2.6.
Key words:
Ground source heat pump, coefficient of
performance, water cooling indirect method.
This is an open access article
published under the terms of the
Creative Commons Attribution
License, which permits unrestricted use, distribution, and
reproduction in any medium, provided the original work is
properly cited.
Cite this article as:
Ishiguro S, Takeda T (2018). Heat
exchanger performance of ground source heat pump by water cooling method. Acad.
J. Environ. Sci. 6(5): 121-128.
