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采暖热损耗计算中的附加率,常因命题陈述不清,致使设计中难以掌握其尺度。例如风力附加率中的不避风高地或厂区内特别高出的建筑物,外门附加率中的短时间开启等,含糊不清的词义都没有明确的界限。又如占热损耗计算中相当比例的、由冷空气渗入引起的附加热损耗,通常是简单地以一个临界判别值来划分附加率的(见图1,所示附加率指附加热损耗占围护结构热损耗的百分率)。以单层窗的生产厂房为例,建筑物高小于4.5米(如4.4米)的附加25％,不小于4.5米(如4.5米)的附加35％,显然,两者高差0.1米而附加率竟差10％,这就难免令人不能确信自己取值的准确性。实际上由0.1米高差引起风速变化产生的相对
The additional rate in the calculation of heating heat loss is often due to the unclear statement of the proposition, making it difficult to grasp the scale of the design. For example, in the wind-addition rate, buildings that are not sheltered from the wind or particularly high in the factory area, and the opening rate of the outer doors are opened for a short period of time, there is no clear boundary between vague terms. Another example is the proportion of heat loss in the calculation of the additional heat loss caused by cold air infiltration, usually simply a critical discriminant value to divide the additional rate (see Figure 1, the additional rate shown refers to the additional heat loss Protection structure heat loss percentage). Take a single-story window production plant as an example, the building height is less than 4.5 meters (such as 4.4 meters) and the additional 25%, not less than 4.5 meters (such as 4.5 meters) of the additional 35%, apparently, the height difference of 0.1 meters and additional If the rate is 10%, it will inevitably lead to uncertainty about the accuracy of their own values. In fact, due to the difference in wind speed caused by the difference in height of 0.1m