Evaluation of the performance of a centralized ground-water heat pump system in cold climate region
Shilei LU1,*(),Zhe CAI1,Li ZHANG2,Yiran LI1
1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China 2. China Aerospace Construction Group Co., Ltd., Beijing 100071, China
The aim of this study is to evaluate the performance of a centralized open-loop ground-water heat pump (GWHP) system for climate conditioning in Beijing with a cold climate in China. Thus, a long-time test was conducted on a running GWHP system for the heating season from December 2011 to March 2012. The analysis of the testing data indicates that the average heat-pump coefficient of performance (COP) and the COP of the system (COPs) are 4.27 and 2.59. The low value and large fluctuation in the range of COP are found to be caused by the heat transfixion in the aquifer and the bypass in the circulation loop. Therefore, some suggestions are proposed to improve the performance for GWHPs in the cold climate region in China.
. [J]. Frontiers in Energy, 2014, 8(3): 394-402.
Shilei LU,Zhe CAI,Li ZHANG,Yiran LI. Evaluation of the performance of a centralized ground-water heat pump system in cold climate region. Front. Energy, 2014, 8(3): 394-402.
Temperature difference of circulation water loop/°C
Flow of circulation water loop/(m3·h-1)
Average value
14–19
4–8
60–150
44
1.5–4.5
210–230
Design value
15
5
194
45
5
243
Tab.5
Fig.3
Fig.4
Fig.5
Fig.6
Fig.7
Gc/m3·h-1)
Ge/m3·h-1)
Tc,o/°C
Te,i /°C
COP
220
50
40
14.5
4.41
158
50
40
14.5
4.46
220
50
38
14.5
4.70
158
50
38
14.5
4.72
220
50
36
14.5
4.99
158
50
36
14.5
5.03
Tab.6
Gc/(m3·h-1)
Ge/(m3·h-1)
Tc,o/°C
Te,i/°C
COP
220
50
40
18.0
5.02
220
50
40
16.5
4.80
220
50
40
14.5
4.41
Tab.7
Fig.8
Fig.9
Fig.10
Fig.11
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