Effect of thermal intensity and initial moisture content on heat and moisture transfer in unsaturated soil

2020 ◽  
Vol 55 ◽  
pp. 102069 ◽  
Author(s):  
Yan Gao ◽  
Shuyue Dong ◽  
Chuang Wang ◽  
Yanhong Chen ◽  
Wenju Hu
Keyword(s):  
Moisture Content ◽  
Unsaturated Soil ◽  
Moisture Transfer ◽  
Initial Moisture Content ◽  
Heat And Moisture Transfer ◽  
Thermal Intensity ◽  
Heat And Moisture

The Influence of Heat and Moisture Transfer in Soil on the Performance of the Ground Heat Exchanger

2012 ◽  
Vol 594-597 ◽  
pp. 2120-2127
Author(s):  
Guo Min Shen ◽  
Chun Fang Lu ◽  
Yi Wang
Keyword(s):  
Thermal Properties ◽  
Heat Exchanger ◽  
Moisture Content ◽  
Moisture Transfer ◽  
Initial Moisture Content ◽  
Borehole Wall ◽  
Ground Heat Exchanger ◽  
Heat And Moisture Transfer ◽  
Soil Thermal Properties ◽  
Heat And Moisture

In this paper, a numerical heat and moisture transfer model (HMTM) and a pure conduction model (PCM) were established separately for unsaturated soil around the ground heat exchanger (GHE) and were numerically solved by finite volume method. The simulation results indicate that rejecting heat into soil can reduce moisture content in the vicinity of the borehole wall. When the initial moisture content is high, moister transfer has little effect on soil thermal properties. In this case, the results of the HMTM and the PCM are basically identical. On the contrary, when the initial moisture content is low, the thermal effect has significant influence on moisture transfer around the borehole wall, and the soil thermal properties will change correspondingly. In this case, there is a large difference between the results of these two models.

Effects of Moisture on Temperature During Drying of Consolidated Porous Materials

1993 ◽  
Vol 115 (3) ◽  
pp. 724-733 ◽  
Author(s):  
F. Kallel ◽  
N. Galanis ◽  
B. Perrin ◽  
R. Javelas
Keyword(s):  
Moisture Content ◽  
Porous Materials ◽  
Moisture Transfer ◽  
Initial Moisture Content ◽  
Transfer Coefficients ◽  
One Dimensional ◽  
Excess Water ◽  
Brick And Mortar ◽  
Heat And Moisture ◽  
Simultaneous Heat

A one-dimensional model for simultaneous heat and moisture transfer in consolidated porous materials is solved for homogeneous brick and mortar slabs. It is validated by comparing numerically predicted moisture content and temperature evolutions with corresponding measured values. It correctly predicts that initially saturated slabs at 20°C which are suddenly placed in contact with air at 20°C and a relative humidity of 50 percent undergo a rapid transient reduction of their temperature down to 13°C due to the evaporation of excess water content. The model is used to study the effets of the initial moisture content and convection transfer coefficients on the minimum temperature of the slabs and on the duration of the transient.

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