温室多层覆盖传热系数与热节省率的工程算法

针对温室环境工程设计和保温性评价中多层覆盖传热计算问题,研究了根据单层保温幕保温性数据确定多层覆盖传热系数的方法。运用工程传热学理论,推导了由单层保温幕热节省率计算多层保温幕热节省率的公式,进而可计算多层覆盖传热系数。计算式揭示了温室单层保温幕和多层覆盖传热参数间的定量关系,通过引入传热阻比这一新概念,形式更加简明。采用多种数据的综合检验结果表明,所提出计算式准确性较高,同一情况下由单层保温幕热节省率计算得出的3层保温幕热节省率,与直接获得的同一热节省率最大相差仅4.6%。论文提出的计算方法,可避免对多种材料组合的各种多层覆盖进行逐一测试,系统地解决了多层覆盖传热计算中热节省率和传热系数确定的...

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Bibliographic Details
Published in农业工程学报 Vol. 27; no. 7; pp. 264 - 269
Main Author 赵淑梅 马承伟 刘晨霞 张义 张建宇 孙国涛
Format Journal Article
LanguageChinese
Published 中国农业大学农业部设施农业工程重点实验室,北京,100083 2011
Subjects
传热系数
多层覆盖
温室
热传递
热节省率
计算
多层覆盖
热节省率
热传递
传热系数
温室
计算
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2011.07.046

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Summary:针对温室环境工程设计和保温性评价中多层覆盖传热计算问题,研究了根据单层保温幕保温性数据确定多层覆盖传热系数的方法。运用工程传热学理论,推导了由单层保温幕热节省率计算多层保温幕热节省率的公式,进而可计算多层覆盖传热系数。计算式揭示了温室单层保温幕和多层覆盖传热参数间的定量关系,通过引入传热阻比这一新概念,形式更加简明。采用多种数据的综合检验结果表明,所提出计算式准确性较高,同一情况下由单层保温幕热节省率计算得出的3层保温幕热节省率,与直接获得的同一热节省率最大相差仅4.6%。论文提出的计算方法,可避免对多种材料组合的各种多层覆盖进行逐一测试,系统地解决了多层覆盖传热计算中热节省率和传热系数确定的问题。
Bibliography:Aiming at computing the heat transfer through multi-layer covering in environmental control design and insulation performance evaluation of a greenhouse,a computing method for thermal transmittance of multi-layer covering was developed based on the data of a single screen.According to heat transfer theory,the formula for saving ratio of heat loss of multi-layer screens were established from that of a single screen,and then the method for calculating the thermal transmittance of multi-layer covering was developed.The computing formula which quantifies the relationship between the heat transfer parameters of multi-layer covering and a single screen become simple by using a new parameter—heat insulation ratio.The high accuracy of the computing formula has been synthetically texted by different kinds of data.In a same case,the saving ratio of heat loss of three-layer screens established from that of a single screen was only 4.6% different from the same saving ratio of heat loss.The computing method developed in t
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2011.07.046