Three kinds of vertical-type ground heat exchangers, U-tube; double-tube; multi-tube, and two kinds of horizontal-type ground heat exchangers, standing Slinky; reclined Slinky, were experimentally and numerically investigated in order to clarify their heat transfer characteristics. Experiments and simulations were carried out under two operation conditions which are continuous operation mode and discontinuous operation mode and effects of temperature recovery and thermal storage on the heat transfer rate were shown. Differences of the heat transfer rate between standing Slinky and reclined Slinky were also indicated.

1.
G.
Myhre
and
d.
Shindell
,
Anthropogenic and natural radiative forcing (chapter 8), Climate change 2013: the physical science basis
,
the IPCC fifth assessment report (working group I) Stockholm
,
659
740
(IPCC 5th assessment report, AR5, 2013) (
2013
)
2.
K.
Tanaka
and
Y.
Higashi
,
Int. J. Refrig.
33
(
3
),
474
(
2010
).
3.
K.
Tanaka
,
G.
Takahashi
and
Y,J.
Higashi
,
Chem. Eng. Data
55
(
6
),
2267
(
2010
).
4.
M.O.
McLinden
,
M.
Thol
,
E.W.
Lemmon
,
Proc. 13th Int. Refrigeration and Air Conditioning Conference at Purdue
(
2010
).
5.
E.W.
Lemmon
,
M.L.
Huber
and
M.O.
McLinden
,
NIST Standard Reference Database 23-Version 9.0
(
2010
).
6.
Ansys Fluent 12.0 User’s Guide
,
Ansys Inc.
,
2009
.
This content is only available via PDF.