The Thermal Behaviour of Three Different Auger Pressure Grouted Piles Used as Heat Exchangers

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• 作者：Fleur Loveridge (1)
  C. Guney Olgun (2)
  Tracy Brettmann (3)
  William Powrie (1)
  
  1. University of Southampton ; Highfield ; Southampton ; SO17 1BJ ; UK
  2. Virginia Tech ; Blacksburg ; VA ; 24061 ; USA
  3. A. H. Beck Foundation Co. ; Inc. ; Houston ; USA
  
• 关键词：Ground source heat pumps ; Piling ; Pile heat exchangers ; Thermal properties ; Thermal response tests
• 刊名：Geotechnical and Geological Engineering
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：33
• 期：2
• 页码：273-289
• 全文大小：2,583 KB
• 参考文献：ASHRAE handbook鈥攈eating, ventilating, and air-conditioning applications. American Society of Heating, Refrigeration and Air-Conditioning Engineers, Atlanta
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Hydrogeology
  Terrestrial Pollution
  Waste Management and Waste Technology
  Civil Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-1529

文摘

Three auger pressure grouted (APG) test piles were constructed at a site in Richmond, Texas. The piles were each equipped with two U-loops of heat transfer pipes so that they could function as pile heat exchangers. The piles were of two different diameters and used two different grouts, a standard APG grout and a thermally enhanced grout. Thermal response tests, where fluid heated at a constant rate is circulated through the pipe loops, were carried out on the three piles, utilising either single or double loops. The resulting test data can be used to determine the surrounding soil thermal conductivity and the pile thermal resistance, both essential design parameters for ground source heat pump systems using pile heat exchangers. This paper uses parameter estimation techniques to fit empirical temperature response curves to the thermal response test data and compares the results with standard line source interpretation techniques. As expected, the thermal response tests with double loops result in smaller thermal resistances than the same pile when the test was run with a single loop. Back analysis of the pile thermal resistance also allows calculation of the grout thermal properties. The thermally enhanced grout is shown to have inferior thermal properties than the standard APG grout. Together these analyses demonstrate the importance of pile size, grout thermal properties and pipe positions in controlling the thermal behaviour of heat exchanger piles.