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Thermal conductivity of cementitious grouts and impact on heat exchanger length design for ground source heat pumps.

Author(s) : ALLAN M. L., KAVANAUGH S. P.

Type of article: Article

Summary

Laboratory studies were undertaken to determine means of improving thermal conductivity of cementitious backfill grouts. Fillers such as silica sand, alumina grit, steel grit, and silicon carbide increased the thermal conductivity to valves ranging from 1.7 to 3.3 W/(m.K). Neat cement grouts had conductivities of 0.80 to 0.87 W/(m.K). Filled cementitious grouts had better retention of thermal conductivity under drying conditions than bentonites and neat cements. The reduction in required bore length possible with cement sand grouts was predicted theoretically for an example heat pump system and found to be 22 to 37%, depending on soil conductivity and bore diameter.

Details

  • Original title: Thermal conductivity of cementitious grouts and impact on heat exchanger length design for ground source heat pumps.
  • Record ID : 2000-0990
  • Languages: English
  • Source: HVAC&R Research - vol. 5 - n. 2
  • Publication date: 1999/04
  • Document available for consultation in the library of the IIR headquarters only.

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