The thermal model building and calculation of portable air enclosure

This paper describes our specially designed portable air enclosure for preserving the calculable AC transferring resistor. The inner space of enclosure is 300 mm times 250 mm times 300 mm. Through solving the Laplace equation of heat conduction in sphere region a worthy conclusion is obtained: When the dimension of the layer of temperature homogeneity approaches the geometrical mean of size of the layer of thermal insulation and inner chamber, the inner temperature homogeneity of portable air enclosure is optimal.