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Simulation on Heat and Moisture Transfer in Soil and Experimental Investigation on Underground Heat Exchanger

Author: YangZuo
Tutor: LiXinGuo
School: Tianjin University
Course: Refrigeration and Cryogenic Engineering
Keywords: Heat and moisture transfer Non-equilibrium thermodynamic Underground heat exchanger Numerical simulation
CLC: TB657.5
Type: Master's thesis
Year: 2007
Downloads: 143
Quote: 1
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Abstract


Soil is a porous medium with complex structure. This paper is written based on the analysis of soil three-phase makeup and soil hydraulic and thermal properties. With heat transfer theory and non-equilibrium thermodynamic theory, the mechanics of heat and moisture transfer in unsaturated soil was studied. The phenomenological equations to describe the transport process in unsaturated soil were established, a transient one-dimension model of heat and moisture transfer was presented and then numerical simulation on the underground temperature and humidity field was carried out.Based on the transient one-dimension model of heat and moisture transfer, the discretization of energy equation and mass equation was given. Numerical method was introduced and a computer program compiled by VB was accompilished to solve the equations. Through the calculation and analysis, effects of different kind of soil, initial moisture content and operation mode on the under ground temperature and humidity field were discussed. The restorative characteristics of the under ground temperature and humidity field were also analysed. Finally, a comparison was made between both heat & mass transfer model and conduction only model.Experiments were carried out on Ground-Coupled Heat Pump system (GCHP) in an office building in Tianjin. With the study of the operation performance of the underguound heat exchangers from 2003 to 2005, the changes of per heat transferred on depth of borehole with time was analysed. The cooling and heating load of the underguound heat exchangers through the 3 years were calculated and the under ground temperature field was discussed. The result shows that there is an evidence unbalance between the cooling load and the heating load, the underground temperature increased year by year. The underguound heat exchanger operation proformance and the GCHP system in summer would be weaken in future.

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