摘要:
本文从分析影响蜂窝纸蒸发降温湿帘蒸发效率的各参数入手,定性地分析了空气在湿帘中的流动状态。在此基础上,确定了改进湿帘结构,提高湿帘效率的正交实验。根据该实验结果和部分全面实验,用最小二乘法,归纳出了效率、阻力与湿帘结构和运行参数之间的相互关系式。根据这些关系式,以湿帘静压差为目标函数,在湿帘效率不低于80％的约束条件下,对湿帘结构参数做了优化计算。通过对优化结构的考证实验表明,该优化结构在风速达到1米/秒以上时,能够达到80％以上的效率。
Abstract:
Based on the principle of "Black—box" , this paper analysed the input and output parameters of honeycomb paper pad system used for lowering the temperature in greenhouses.The relationships between these input and output parameters are complex because they are mainly affected by both the structural geometric sizes of the pad and the air flow velocity passing through the pad. The orthogonal experimental method is used to analyse the pad system.According to the orthogonal experiments and some other supplementary experiments, a set of empirical formulae for evaporative efficiency and state pressure difference were derived with the least square method. By these formulae, an optimal set of the structural geometric sizes is calculated.The calculated result shows that the evaporative efficiency is higher than 80%. As the author of this paper made several peformance tests of the pad with the calculated structural geometric sizes the results were satisfied.
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