Simulation Study on Heat Transferring Performance of Vertical T-Tube Ground Heat Exchangers

Abstract:

In the Ground Source Heat Pump system, the vertical U-tube is the most common ground heat exchanger. The heat transfer between the U-tube and the soil is affected by many factors. For analyzing the influence of these factors on heat transfer of the U-tube, I use GAMBIT software to establish a physical model who is used to simulated the heat exchanging of single U-tube heat exchanger and the surrounding soil physical. and mesh it. On the base, we take advantage of FLUENT software to make numerical simulation. After finishing analysis, we got some conclusions as follows: Under different tube wells depths and different inlet water temperature conditions, with the pipe inlet velocity increases, the heat exchanger performance improves, but the temperature difference between the import and the export will decreases. In addition to improve the inlet temperature of the U-tube, we can significantly increase the transferring heat of the ground heat exchanger.

• Periodical: Advanced Materials Research (Volumes 805-806)
• Pages: 547-551
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.805-806.547
• Online since: September 2013
• Authors: Shao Wen Shang, Pei Pei Li, Dong Wen Fang
• Keywords: Ground Source Heat Pump (GSHP), Heat Transfer Performance, Numerical Simulation, U-Tube Ground Heat Exchanger

References

[1] Steven Kavanaugh. Development of design tools for ground-source heat pump piping. ASNHARE Trans, 1998, (104)2: 923~937.

[2] Zhang Xiaoming, Wu Jiankun, Wei Lingmin. Numerical simulation on soil temperature field around vertical U-tube heat exchangers［J］. Journal of Shenyang Jianzhu University: Natural Science, 2011, 27( 1) : 111 －114.

[3] Li Peng, Qiu Zhongzhu, Yu Liqian . The theories study of the ground temperature field of the U-Shaped vertical loop of pipe of the Ground Heat Pump［J］. Building Energy & Environment, 2000(4): 1~4.

[4] Song Xinnan, Zhang Zhipeng, Liu Lihong. Simulation of the periodical heat transfer performance of verticalground heat exchanger［A］. The 6th International Symposium on Heating, Ventilating and Air Conditioning［C］, Nanjing, (2009).

[5] Li Xinguo, Xue Yuwei, Zhao Jun. Experimental Re search on Different Type s of Underground Heat Exchangers［J］. Journal of Refrigeration, 2004，25( 2) : 39—42.

[6] GB 50366—2009, Ground source heat pump systems engineering and technical specifications[S].