Numerical simulation on heat transfer performance of vertical U-tube with different borehole fill materials

Abstract

Heat exchange performance of vertical U-tube heat exchanger was studied with two different borehole fill materials and CFD software. Borehole surface temperature and water temperature distribution were simulated on the condition of continuous operation for 8 h in winter with inlet water temperature being 10 °C. The results show that there is no obvious difference on heat exchanger performance between the two different borehole fill materials.

Keywords

vertical U-tube heat exchanger / ground-source heat pump / numerical simulation

References

[1] WangYong, SangChun-lin, ZhangYi-zhuo. Exploration of feasibility of applying on ground-source heat pump in western region of China[J]. Journal of Chongqing University, 2002, 22(8): 145-146(in Chinese)

[2] QU Yun-xia, ZHANG Lin-hua, GUI Yong-zhang. Ground-coupled heat pumps and application analysis [J]. Renewable Energy, 2002(4): 7–9. (in Chinese)

[3] TuAi-min, ZhouEn-ze, TongShao-chen, et al.. Geothermal heat pump and simulation of vertical U-tube ground heat exchanger[J]. Refrigeration and Airconditioning, 2005, 5(5): 34-38(in Chinese)

[4] LU Li-xia, LI Su-fen, LI Liang, et al. Numerical simulation of the soil temperature field around vertically buried pipe of a ground-source heat pump[J]. Energy Conservation, 2005(6): 6–9. (in Chinese)

[5] WangXin, YuYa-nan, GaoQing-feng. Research on heat transfer of double-pipe heat exchanger for ground-source heat pump[J]. HVAC, 2005, 35(6): 16-19(in Chinese)

[6] HU Qing-song, ZHANG Yuan. Discussion on the shallow ground low temperature geothermal energy and the method of application[J]. Engineering Construction and Design, 2005(9): 9–11. (in Chinese)

[7] YanAi-bin, ZhaoJun. Experimental research and optimizing analysis for underground U-tube heat exchangers of ground source heat pump system[J]. Journal of Tianjin Institute of Urban Construction, 2005, 11(2): 124-127(in Chinese)

[8] SunHeng-hu, CuiJian-qiang, MaoXin-li. The mechanism of the ground source heat pump for energy conservation[J]. Acta Energiae Solaris Sinica, 2004, 25(1): 24-27(in Chinese)

[9] FangZhao-hong, DiaoNai-ren, ZengHe-yi. Heat transfer and analysis of ground heat exchangers [J]. Journal of Engineering Thermophysics, 2004, 25(4): 685-687(in Chinese)

[10] ZhuangYing-chu, SunYou-hong, XieKang-he. Study on performance of backfilled soil for vertical-buried closed-loop GSHP[J]. Acta Energiae Solaris Sinica, 2004, 25(2): 216-220(in Chinese)