The reason why the electric heating vacuum drying box does not have the temperature uniformity parameter

The general electric (blast) drying ovens are equipped with temperature uniformity parameters: the natural convection oven is the upper limit of the operating temperature multiplied by 3%, and the forced convection oven is the upper limit of the operating temperature multiplied by 2.5%. However, the electric vacuum drying oven does not have a temperature uniformity parameter. Why?

There is almost no possibility of relying on the movement of gas molecules in the vacuum oven to make the temperature of the studio uniform.

Therefore, conceptually we can no longer use the temperature uniformity defined by the usual electric (blast) drying oven to the vacuum drying oven.

It is also meaningless to set this indicator under vacuum. The amount of thermal radiation is inversely proportional to the square of the distance. For the same object, the radiant heat received at 20 cm from the heated wall is only 1/4 of 10 cm from the heated wall. big difference. This phenomenon is warm when the sun is shining in the winter, and the sun is not warm. It is a truth that the sun is not cold. Because the vacuum drying oven is difficult to make the radiant heat of each point (the spherical surface) in the three-dimensional space of the studio uniform and lacks an authoritative evaluation method, it may be that the standard of the electric vacuum drying oven is not provided. The reason for the temperature uniformity parameter.

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