日光温室夜间后墙不同高度放热量差异的理论分析
投稿时间:2018-07-24  修订日期:2018-07-24  点此下载全文
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作者单位E-mail
张传坤 山东省农业科学院蔬菜花卉研究所 zhangchuankun@sina.com 
魏 珉 山东农业大学 园艺科学与工程学院  
刘福胜 山东农业大学 水利土木工程学院  
徐平丽 Bio-tech Research Centre of Shandong Academy of Agricultural Sciences  
李 岩 山东农业大学 园艺科学与工程学院  
基金项目:国家大宗蔬菜产业技术体系建设专项(CARS-25);“十二五”国家科技支撑计划课题(2014BAD05B03);山东省农业重大应用技术创新课题(鲁财农指(2015)16) 第一作者:张传坤,副研究员,主要从事设施环境工程与调控研究,E-mail:zhangchuankun@sina.com通讯作者徐平丽,研究员,主要从事生物工程技术研究,E-mail:xupingl@sina.com
中文摘要:针对日光温室后墙不同高度放热量差别较大的现象,运用物理学矢量原理、气体分子动理论,对外界低温通过覆盖面在后墙形成的放热机理进行推导;在放热机理指引下,对后墙放热数据进行分析;为完善日光温室后墙放热理论,提高温室保温性能提供理论依据。结果表明:后墙放热后温度不断下降,后墙放热量自上而下逐渐增多,下侧放热量是上侧放热量的2~3倍。数据分析表明:推导出的后墙放热机理能够解释后墙不同高度放热量差异,后墙放热是在外界低温驱动下的被动放热。后墙温度高时,后墙放热量受后墙温度和后墙放热驱动共同作用,后墙中部放热量也会很多;后墙温度低时,后墙放热量主要受后墙放热驱动作用。
中文关键词:日光温室  后墙  放热量  放热机理  驱动  被动放热
 
Theoretical analysis on difference of heat-releasing volume at different height of the back Wall in solar greenhouse at Night
Abstract:Aiming at the phenomenon that the heat-releasing volume of the back wall at different heights in solar greenhouse were quite different, this study first deduced the heat-releasing mechanism of the back wall formed by the outer low temperature through greenhouse cover with the physics vector principle and the gas molecular movement theory as foundation, and then analyzed the heat-releasing data of back wall under the guidance of heat-releasing mechanism, improving the theory of heat-releasing from the back wall and providing theoretical basis to improve the temperature environment of greenhouse. The results showed that the temperature of the back wall decreases continuously after releasing heat, and the heat-releasing volume from the back wall increased gradually from the top side to the bottom side, and the heat-releasing volume from the bottom side was 2~3 times higher than that from the top side. The data analysis shows that the deduced exothermic mechanism can explain the heat-releasing difference at different height of the back wall, and the heat release of the back wall is a passive heat release process driven by the external low temperature. The heat-releasing volume is affected by the heat release drive and the temperature of the back wall when the temperature of back wall is high, and the heat-releasing volume in the middle of the back is also much; the heat-releasing volume of the back wall is mainly driven by the heat release drive of the back wall when the temperature of the back wall is low.
keywords:solar greenhouse  back wall  heat-releasing volume  exothermic mechanism  drive  passive heat release
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