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Effects of long-term operation of ground-source heat pump on soil heat balance in hot summer and cold winter region
Author(s): 
Pages: 74-79+85
Year: Issue:  10
Journal: Rural Energy

Keyword:  ground-source heat pumphot summer and cold winter regionheat balanceheat transfernumerical simulation;
Abstract: A three-dimensional mathematical model of convection heat transfer in U-tube ground heat exchanger and heat transfer between U-tube ground heat exchanger and its surrounding soil is established by coupling the calculations of building load and operating parameters of ground-source heat pump.The soil temperature distribution and heat flux distribution along ground heat exchanger in operation for 20 years are obtained and heat balance of surrounding soil under long-term operation is analyzed.It is found that average soil temperature rises and tends to be stable with its contour changing from the horizon to inverted cone in cooling season and cone in heating season,respectively,and turning to upright after 5 years.The heat flux along the inlet pipe increases in heating season and decreases in cooling season which,however,reaches stable in a long-term operation.The heat flux along the inlet pipe reaches the maximum in the depth of 4~7 m.The reverse heat transfer exists between the outlet pipe and soil near the ground surface which is more obvious in heating season with a maximum depth of about 1.76 m.The results are of significance for GSHP application and generalization in hot summer and cold winter region.
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