|
|
Optimization for operating modes based on simulation
of seasonal underground thermal energy storage |
ZHAO Jun, CHEN Yan, LI Xinguo |
School of Mechanical Engineering, Tianjin University; |
|
|
Abstract A simulation was performed, which concerned the feasibility of seasonal underground thermal energy storage (UTES) in Tianjin, China. The investigated system consisted of 8 boreholes. In summer, residual solar thermal energy was emitted into the soil surrounding the borehole heat exchangers through which the stored energy was extracted in winter with a ground coupled heat pump (GCHP) to provide a proper heating temperature. A simulation study was performed to study the influence of system operation modes on thermal recovery based on the experimental data of a GCHP system, local meteorological conditions and soil properties in Tianjin. The results indicate a thermal recovery ratio of less than 67% and different temperature distributions under three modes. Finally, an operation mode was suggested based on both lower loss and better thermal recovery in the UTES.
|
Issue Date: 05 September 2008
|
|
1 |
Chinese Academy ofSciences. . 2005 Strategic Report: China's Sustainable Development. Beijing: Science Press, 2005
|
2 |
Sanner B, Karytsas C, Mendrinos D, et al.. Current status of ground source heat pumps andunderground thermal energy storage in Europe. Geothermics, 2003, 32(4–6): 579–588. doi:10.1016/S0375‐6505(03)00060‐9
|
3 |
Nielsen K . Thermalenergy storage a state-of-the-art. A Reportwithin the Research Program “Smart Energy-Efficient Buildingsat NTNU and SINTEF”, 2003
|
4 |
Gu Yan, O'Neal D L . Modeling the effect of backfillson U-tube ground coil performance. ASHRAETrans, 1998, 104(2): 46–54
|
5 |
Arif H, Ozay A, Ebru H . Experimental study of a closed loop vertical ground sourceheat pump system. Energy Conversion andManagement, 2003, 44(4): 527–548. doi:10.1016/S0196‐8904(02)00073‐0
|
6 |
Zhao Jun . Heat transfer and thermal performance of the vertical downhole heatexchanger for ground source heat pumps. Dissertation for the Doctoral Degree. Tianjin: Tianjin University, 2002
|
7 |
Li Xinguo, Chen Yan, Chen Zhihao, et al.. Thermal performances of different types of undergroundheat exchangers. Energy and Buildings, 2006, 38(5): 543–547. doi:10.1016/j.enbuild.2005.09.002
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|