预计平均热感觉指数PMV的简化计算法

Simplified Calculation Method of the Predicted Mean Thermal Sensation Index PMV

预计平均热感觉指数PMV是国际标准组织公认的热环境评价指标,但由于PMV计算模型所含参数量较多,计算过程复杂,通常需要借助计算机或者作图法进行计算。通过人体辐射散热项线性化、辐射换热系数与对流换热系数综合、引入折算温度、用易得的皮肤平均温度代替难以获得的服装外表面温度的处理方式,将PMV计算模型中的人体辐射散热项与对流散热项综合并简化;然后基于PMV值大小是人体散热量偏离Fanger"热中性"条件下散热量的差值所产生的理念,得出了可实现现场快速手工计算的PMV简化模型。简化后的PMV计算模型相对于Fanger的PMV计算模型的计算误差很小,可忽略。

The predicted mean thermal sensation index PMV is the accepted thermal environment evaluation index of the international standards organization,but the PMV(Predicted Mean Vote)model contains a large number of parameters,and the calculation process is complex,usually need to use a computer or graph method to calculate.By linearizing the radiation heat loss of human body,combining radiative heat transfer coefficient and convection heat transfer coefficient,introducing the operative temperature and replacing the mean skin temperature(that is easy to get)with the surface temperature of clothing(that is hard to obtain),the human body radiant and convection term are combined and simplified.Then,based on the concept that PMV value is the difference of heat loss from Fanger s“hot neutral”conditions,the simplified model of PMV can be calculated quickly by hand.The error of the simplified calculation model of PMV is very small,and can be neglected comparing with the Fanger s PMV calculation model.