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P. Cui, X. Li, Y. Man and Z. Fang, “Heat Transfer Analysis of Pile Geothermal Heat Exchangers with Spiral Coils,” Applied Energy, Vol. 88, No. 11, 2011, pp. 4113-4119.
http://dx.doi.org/10.1016/j.apenergy.2011.03.045

has been cited by the following article:

• TITLE: The Application of the Ground Source and Air-to-Water Heat Pumps in Cold Climate Areas

  AUTHORS: Kaspar Tennokese, Teet-Andrus Kõiv, Alo Mikola, Villu Vares

  KEYWORDS: Ground Source Heat Pump; Air-Water Heat Pump; Heat Requirement; COP

  JOURNAL NAME: Smart Grid and Renewable Energy, Vol.4 No.7, October 23, 2013

  ABSTRACT: This article gives an overview of using the ground source heat pump (GSHP) and air-to-water heat pump (A&WHP) in cold climate areas for heating and for domestic hot water production of buildings. Computer simulation and analysis were carried out for a typical detached house, with 200 m2 of living area, the heat demand of 9 kW and the average heat demand for DHW production of 1 kW. In heating period the average Coefficient of Performance (COP) of the A&WHP is considerably lower than COP of the GSHP.