›› 2017, Vol. 38 ›› Issue (2): 333-340.doi: 10.16285/j.rsm.2017.02.004

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Thermal response of energy piles with embedded tube and tied tube

LIU Han-long1, 2, 3, WU Di1, 2 , KONG Gang-qiang2, 3, WANG Cheng-long1, 2, CHARLES W W Ng4   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain area of Ministry of Education, Chongqing University, Chongqing 400045, China; 3. College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 4. Civil Engineering Department, Hong Kong University of Science and Technology, Hong Kong, China
  • Received:2015-04-09 Online:2017-02-11 Published:2018-06-05
  • Supported by:

    This work was supported by the Graduate Scientific Research and Innovation Foundation of Chongqing of China (CYB16013), the National Natural Science Foundation of China (51378178, 51306080) and the Foundation of Key Laboratory of Mountainous Town Construction and New Technology of the Ministry of Education (0902071812401).

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Abstract: The energy pile with embedded steel tube is a new type of ground source heat pump (GSHP) technique in the form of pipe-coupled pile. However, there are few studies focused on thermal response of this new pipe form. Experimental test and numerical simulation were conducted to study the heat transfer from tube to steel tube, to concrete, and to soil of energy piles with single U-shaped embedded steel tube. Temperature variations of surrounding soil and pile shaft under temperature loading of heating-cooling cyclic were measured. The thermal response of the ordinary single U-shaped heat exchanger energy pile with tied tube was also tested for comparative analysis. Finally, the applicability of energy pile with embedded steel tube was analyzed. The results show that the thermal response of energy pile with embedded steel tube is slightly lower than that of energy pile with tied tube. The final temperature of surrounding soil and pile shaft of two types of energy pile varies 23% and 16% in summer, and 14% and 18% in winter.

Key words: energy pile, tube buried type, thermal response, model test, COMSOL software

CLC Number: 

  • TU 473.1

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