Simplification and experimental verification for temperature and humidity field coupling model of conservatory soil

Abstract

Based on the surface energy balance model which is widely used abroad, a temperature and humidity field coupling model of conservatory soil without crop vegetation in full illumination was established. Considering the relatively closed environment in conservatory, weak solar radiation and little surface evaporation of soil, the daily variation of water content in different soil layers may be neglected, then the temperature and humidity field coupling model was simplified to a one-dimensional thermal diffusion model. The simplified model and the temperature and humidity field coupling model adopted the same computational method of soil physical parameters and discrete format of heat diffusion differential equations, and were applied to the continuous simulation of temperature field in conservatory soil without crop vegetation in full illumination. Through the comparison between simulation results and experimental data, the precision of the simplified model was verified. The typical rule of soil heat flux variation in a 24 h cycle was also obtained.

Keywords

conservatory / soil / temperature / humidity / coupling model / simplification

References

[1] Chen Zhenqian, Shi Mingheng. Simulation of temperature and moisture distribution in unsaturated soil under exposure of solar radiation[J]. Acta Energiae Solaris Sinica, 1998(1): 13–19 (in Chinese).

[2] Chen W., Liu W., Huang Suyi. A study of convective heat transfer in passive solar conservatory with storage[J]. Journal of Engineering Thermophysics, 2003, 24(3): 508-510.

[3] Liu B., Liu W., Wang Chongqi. Study on heat and mass migration and water evaporation in soil with dry surface layer under natural environment conditions[J]. Acta Energiae Solaris Sinica, 2004, 25(3): 299-304.

[4] Fan A., Liu W., Li Guangzheng. Modeling for simultaneous transfer of heat, moisture, gas and solute in soil with plants growing[J]. Journal of Huazhong University of Science and Technology, 2005, 33(9): 59-61.

[5] Fan A., Liu W., Wang Chongqi. Simulation on the daily change of soil temperature under various environment conditions [J]. Acta Energiae Solaris Sinica, 2003, 24(2): 167-171.

[6] Fan A., Liu W., Wang Chongqi. Experimental study on the daily changes of soil temperature and water content[J]. Acta Energiae Solaris Sinica, 2002, 23(6): 721-724.

[7] Qin Z., Berliner P., Karnieli Arnon. Numerical solution of a complete surface energy balance model for simulation of heat fluxes and surface temperature under bare soil environment[J]. Applied Mathematics and Computation, 2002, 130(1): 171-200.

[8] Jacobs A. F. G., Verhoef A. Soil evaporation from sparse natural vegetation estimated from Sherwood numbers[J]. Journal of Hydrology, 1997, 188–189, 443-452.

[9] Mihalakakou G. On estimating soil surface temperature profiles[J]. Energy and Buildings, 2002, 34(3): 251-259.

[10] Lei Z., Yang S., Xie Senchuan. Soil Hydrodynamic[M]. 1988, Beijing, China: Tsinghua University Press.

[11] Campbell G. S., Norman J. M. An Introduction to Environmental Biophysics[M]. 1998, New York, USA: Springer 119-121.