There are temperature uniformity parameters: natural convection drying oven is the upper limit of working temperature multiplied by 3%, and forced convection drying oven is the upper limit of working temperature multiplied by 2.5%. Only the electric heating vacuum drying oven does not have a temperature uniformity parameter. Why? There is almost no possibility that the temperature of the working chamber can reach a uniform temperature by relying on the movement of gas molecules in the vacuum drying box. Therefore, conceptually, we can no longer apply the definition of temperature uniformity specified by the usual electric heating (blast) drying oven to the vacuum drying oven. It is meaningless to set this index in a vacuum state. The amount of heat radiation is inversely proportional to the square of the distance. For the same object, the radiant heat received at a distance of 20 cm from the heating wall is only 1/4 of that at a distance of 10 cm from the heating wall. big difference. This phenomenon is the same as when you bask in the sun in winter, the side that is exposed to the sun is warm and the side that is not exposed to the sun is colder. Due to the structure of the vacuum drying oven, it is difficult to make the radiant heat of each point in the three-dimensional space of the studio uniform, and there is also a lack of evaluation methods. This may be the reason why the temperature uniformity parameter is not set in the standard of the electric heating vacuum drying oven. .
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