A constant temperature and humidity air-conditioning system driven by a ground source heat pump was designed and constructed in an archives building in Shanghai. The system consists of a water-to-water heat pump and 280 boreholes with 80 m in depth. During the operation in summer, the heat extraction from the condenser of the heat pump was divided: Part was rejected to the soil, while another was used to reheat the air in air handling units (AHUs). According to the experimental results under a typical summer weather condition of Shanghai, the average coefficient of performance of the heat pump was 5.4. The average indoor temperature and relative humidity of the archives house were $22.8°C$ and 46.6%, respectively. Since part of the heat extraction from the condenser was used to reheat the air in AHUs, the heat rejected to the soil was reduced by 23%, which was helpful for the earth energy conservation. According to the theoretical analysis, the distance between two boreholes is suggested to be 4–5 m. The deepness of the boreholes is suggested to be 80–100 m in Shanghai.

1.
Hepbasli
,
A.
, and
Akdemir
,
O.
, 2004, “
Energy and Exergy Analysis of a Ground Source (Geothermal) Heat Pump System
,”
Energy Convers. Manage.
0196-8904,
45
, pp.
737
753
.
2.
Yusuf
,
A. K.
, 2007, “
Experiment Performance Evaluation of a Closed-Loop Vertical Ground Source Heat Pump in the Heating Mode Using Energy Analysis Method
,”
Int. J. Energy Res.
0363-907X,
31
, pp.
1504
1516
.
3.
Marcotte
,
D.
, and
Pasquier
,
P.
, 2008, “
Fast Fluid and Ground Temperature Computation for Geothermal Ground-Loop Heat Exchanger Systems
,”
Geothermics
0375-6505,
37
, pp.
651
665
.
4.
Sharqawy
,
M. H.
,
Mokheimer
,
E. M.
, and
,
H. M.
, 2009, “
Effective Pipe-to-Borehole Thermal Resistance For Vertical Ground Heat Exchangers
,”
Geothermics
0375-6505,
38
, pp.
271
277
.
5.
Russo
,
S. L.
,
Boffa
,
C.
, and
Civita
,
M. V.
, 2009, “
Low-Enthalpy Geothermal Energy: An Opportunity to Meet Increasing Energy Needs and Reduce and Atmospheric Pollutant Emissions in Piemonte, Italy
,”
Geothermics
0375-6505,
38
, pp.
254
262
.
6.
Gerard
,
A.
,
Genter
,
A.
,
Kohl
,
T.
,
Lutz
,
P.
,
Rose
,
P.
, and
Rummelf
,
F.
, 2006, “
The Deep EGS (Enhanced Geothermal System) Project at Soultz-sous-Forets (Alsace, France)
,”
Geothermics
0375-6505,
35
, pp.
473
483
.
7.
Hwang
,
Y.
,
Lee
,
J.
,
Jeong
,
Y.
,
Koo
,
K.
,
Lee
,
D.
,
Kim
,
I.
,
Jin
,
S.
, and
Kim
,
S.
, 2008, “
Cooling Performance of a Vertical Ground-Coupled Heat Pump System Installed in a School Building
,”
Renewable Energy
0960-1481,
5
, pp.
1
5
.
8.
Hochstein
,
M. P.
, and
Moore
,
J. N.
, 2008, “
Indonesia: Geothermal Prospects and Developments
,”
Geothermics
0375-6505,
37
, pp.
217
219
.
9.
Gao
,
Q.
,
Li
,
M.
,
Yu
,
M.
,
Spitler
,
J. D.
, and
Yan
,
Y. Y.
, 2009, “
Review of Development From GSHP to UTES in China and Other Countries
,”
Renewable Sustainable Energy Rev.
1364-0321,
13
, pp.
1383
1394
.
10.
Hunt
,
T. M.
,
Carey
,
B. S.
, and
Mroczek
,
E. K.
, 2009, “
Special Issue on the Wairakei Geothermal Field, New Zealand: 50 Years Generating Electricity Preface
,”
Geothermics
0375-6505,
38
, pp.
3
10
.
11.
Serpen
,
U.
,
Aksoy
,
N.
,
Ongur
,
T.
, and
Korkmaz
,
E. D.
, 2009, “
Geothermal Energy in Turkey: 2008 Update
,”
Geothermics
0375-6505,
38
, pp.
227
237
.
12.
Thain
,
I. A.
, and
Carey
,
B.
, 2009, “
Fifty Years of Geothermal Power Generation at Wairakei
,”
Geothermics
0375-6505,
38
, pp.
48
63
.
13.
Zeng
,
H. Y.
,
Diao
,
N. R.
, and
Fang
,
Z. H.
, 2002, “
A Finite Line-Source Model for Boreholes in Geothermal Heat Exchangers
,”
Heat Transfer Asian Res.
1099-2871,
31
, pp.
558
567
.
14.
Zeng
,
H. Y.
, and
Fang
,
Z. H.
, 2002, “
A Mathematical Model of Axial Fluid Temperature for U-Tube Geothermal Heat Exchangers
,”
Journal of Shandong Institute of Architecture and Engineering
,
17
, pp.
7
11
, in Chinese.
15.
Zeng
,
H. Y.
,
Diao
,
N. R.
, and
Fang
,
Z. H.
, 2003, “
A Quasi Three Dimensional Heat Transfer Model for Vertical U-Tube Geothermal Heat Exchangers
,”
Journal of Engineering for Thermal Energy & Power
,
18
, pp.
387
390
, in Chinese.