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Research of heat and moisture transfer influence on the characteristics of the ground heat pump exchangers in unsaturated soil

Journal Article


Abstract


  • In recent years, the ground source heat pump (GSHP) system has been widely used due to its high unit efficiency, considerable energy conservation and low operating cost. However, the heat transfer efficiency of ground heat exchangers (GHE) in some projects decreases year by year. This results in the decrease of performance of the GHSP system. This is mainly because of lacking of the deep research about the heat and moisture transfer influence on the GHE in unsaturated soil. In this paper, a new model for predicting the soil thermal conductivity under different temperatures was developed. By comparing with the Campbell and de V-1 models, the new model showed better performance on predicting the soil thermal conductivity. Thereafter, a coupled heat and moisture transfer model in unsaturated soil was established for the GHE. In addition, the mode1 was verified by comparing its results against those established by other researchers. By the results, it was found that the model calculation results agreed well with the experimental data in the literature. Finally, the effects of different factors, including the soil types, soil porosity on the characteristics of the GHE were studied.

UOW Authors


  •   Wang, Zhihua (external author)
  •   Wang, Fenghao (external author)
  •   Ma, Zhenjun
  •   Wang, Xinke (external author)
  •   Wu, X (external author)

Publication Date


  • 2016

Citation


  • Wang, Z., Wang, F., Ma, Z., Wang, X. & Wu, X. (2016). Research of heat and moisture transfer influence on the characteristics of the ground heat pump exchangers in unsaturated soil. Energy and Buildings, 130 140-149.

Scopus Eid


  • 2-s2.0-84983402574

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6075

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 140

End Page


  • 149

Volume


  • 130

Place Of Publication


  • Netherlands

Abstract


  • In recent years, the ground source heat pump (GSHP) system has been widely used due to its high unit efficiency, considerable energy conservation and low operating cost. However, the heat transfer efficiency of ground heat exchangers (GHE) in some projects decreases year by year. This results in the decrease of performance of the GHSP system. This is mainly because of lacking of the deep research about the heat and moisture transfer influence on the GHE in unsaturated soil. In this paper, a new model for predicting the soil thermal conductivity under different temperatures was developed. By comparing with the Campbell and de V-1 models, the new model showed better performance on predicting the soil thermal conductivity. Thereafter, a coupled heat and moisture transfer model in unsaturated soil was established for the GHE. In addition, the mode1 was verified by comparing its results against those established by other researchers. By the results, it was found that the model calculation results agreed well with the experimental data in the literature. Finally, the effects of different factors, including the soil types, soil porosity on the characteristics of the GHE were studied.

UOW Authors


  •   Wang, Zhihua (external author)
  •   Wang, Fenghao (external author)
  •   Ma, Zhenjun
  •   Wang, Xinke (external author)
  •   Wu, X (external author)

Publication Date


  • 2016

Citation


  • Wang, Z., Wang, F., Ma, Z., Wang, X. & Wu, X. (2016). Research of heat and moisture transfer influence on the characteristics of the ground heat pump exchangers in unsaturated soil. Energy and Buildings, 130 140-149.

Scopus Eid


  • 2-s2.0-84983402574

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6075

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 140

End Page


  • 149

Volume


  • 130

Place Of Publication


  • Netherlands