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Estimation of Thermal Diffusivity for Greenhouse Soil Temperature Simulation

1
Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education and Jiangsu Province, School of Agricultural Equipment Engineering, Jiangsu University, Zhenjiang 212013, China
2
Department of Food, Agricultural and Biological Engineering, Ohio State University, Wooster, OH 44691, USA
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(2), 653; https://doi.org/10.3390/app10020653
Received: 15 December 2019 / Revised: 8 January 2020 / Accepted: 10 January 2020 / Published: 16 January 2020
(This article belongs to the Section Environmental and Sustainable Science and Technology)
In greenhouse energy balance models, the soil thermal parameters are important for evaluating the heat transfer between the greenhouse air and the soil. In this study, the soil thermal diffusivity was estimated from greenhouse soil temperature data using the amplitude, phase-shift, arctangent, logarithmic, and min-max methods. The results showed that the amplitude method and the min-max method performed well in estimating the soil thermal diffusivity. The obtained soil thermal diffusivity was input into a sinusoidal model to determine the greenhouse soil temperature at different soil depths. For greenhouse applications, the daily average soil temperature at different depths was predicted according to the temperature at the surface and the annual mean soil temperature. The model was validated using soil temperature data from summer and winter, when the greenhouse was cooled and heated, respectively. View Full-Text
Keywords: soil heat transfer; greenhouse; modeling; soil temperature; thermal diffusivity soil heat transfer; greenhouse; modeling; soil temperature; thermal diffusivity
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Wang, J.; Lee, W.F.; Ling, P.P. Estimation of Thermal Diffusivity for Greenhouse Soil Temperature Simulation. Appl. Sci. 2020, 10, 653.

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