Yachen Sun;Yao Zhang;Chenmeng Zhu;Shaonan Xu;Bowen Liu;Yanfei Cao;Changji Zhou;Yaqi Zhou;Zhirong Zou;Encai Ba

Key Laboratory of Protected Horticultural Engineering in Northwest, Ministry of Agriculture and Rural Affairs, Department of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, Chin;School of Karst Science, Guizhou Normal University, Guiyang 550001, China;Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China;Key Laboratory of Protected Horticultural Engineering in Northwest, Ministry of Agriculture and Rural Affairs, Department of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China;School of Ocean and Earth Science, Tongji University, Shanghai, 200092, China.;Department of Management, City University of Hong Kong, Tat Chee Avenue Kowloon, Hong Kong 999077, China;Qinghai College of animal husbandry and veterinary technology, Xining 812100, China

thermal;disfigurements;solar greenhouse;envelopes;thermal insulation;quil

The objectives of the present work are focused on exploration of the reasons for temperature difference in different envelopes, the sensitivity of envelopes of solar greenhouse to thermal disfigurements and optimal selection of the thermal insulation quilt. Theoretical analysis and derivation are conducted according to the experimental results of surface temperature, convective heat transfer, and heat flux density in different envelopes which with thermal disfigurements of solar greenhouse using heat transfer theory. The results revealed that the difference of intrinsic thermal conductivity and thickness of the envelopes leads to difference in the thermal flux and thus in the surface temperature of different envelopes. Compared with the front roof and back roof, the wall is more sensitive to thermal disfigurements. According to the influence of thermal disfigurements on solar greenhouse temperature, the allowable thermal disfigurements area fraction of front roof and back roof are given. Based on the analysis of heat transfer theory and test results, the work given the expression of the thickness and thermal conductivity of thermal insulation quilt under different outdoor minimum temperatures for optimal selection of thermal insulation quilt based on comprehensive considering factors of the solar greenhouse structure, crop demand, outdoor minimum temperature, and insulation quilt properties. The results of this work give technical criterion for whether the envelopes with thermal disfigurements needs to be repaired or replaced, and it also provide theoretical and technical support for design the solar greenhouse as well as methodological guidance for the optimal selection of the thermal insulation quilt.