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Indexed by:期刊论文

Date of Publication:2017-02-05

Journal:APPLIED THERMAL ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:112

Page Number:1083-1094

ISSN No.:1359-4311

Key Words:Coupled heat and mass transfer; Ground source; Heat pump system; Unsaturated porous medium

Abstract:This research presents an unsaturated three-dimensional model to study a ground source heat pump system based on moisture porous theory and soil moisture dynamics. The experiments are performed under the same condition as in the numerical methods. The soil temperature along 50 m deep of the U tube shows good agreement with the simulation results. The shallow soil temperature decreases by approximately 0.5-0.9 degrees C, during the heating period, when the infiltration and evaporation are considered by adding a source phase equation on the same operation time. The infiltration-influencing factors (e.g. soil moisture rate and soil saturated hydraulic conductivity) and the evaporation-influencing factors (e.g. soil saturated moisture content) are also calculated. The soil temperature decreases by approximately 5-8% as the influencing factors increase by 50-100%. Furthermore, the effect on the shallow soil is obvious, especially at a depth of 5 m and attenuates with the soil depth. (C) 2016 Elsevier Ltd. All rights reserved.