For the radiative heat transfer calculation, the criterion for determining the number of surfaces of an enclosure radiant system is
A. Geometric boundary conditions of enclosure systems
B. Thermal boundary conditions of enclosure systems
C. Geometric and thermal boundary conditions of enclosure systems
D. Geometric or thermal boundary conditions of enclosure systems
查看答案
In the radiation network diagram of an enclosure on a diffuse-grey-body surface, the effective radiation on the surface can be equivalent to
A. Source potential
B. Node potential
C. Surface radiation thermal resistance
D. Space radiation thermal resistance
For the purpose of plating silver on the surface of the thermos flask, which description is correct
A. Strengthen heat transfer of thermos
B. Increase the emissivity of the flask surface of the thermos bottle
C. Reduce the emissivity of the flask surface of the thermos bottle
D. Increase the absorptance of the flask surface of the thermos flask
To further improve the heat shielding effect of the heat shelter (the surface of the heat shield is a gray surface), which of the following is correct
A. Improve the surface emissivity of the heat shelter surface
B. Reduce the surface emissivity of the heat shelter surface
C. Reduce the surface absorptance of the heat shelter surface
D. Increase the surface temperature of the heat shelter
The main reason why air-conditioning outdoor machines are generally white or light-colored is
A. White or light-colored paint has a greater reflectance of solar radiation than other colors of paint
B. White or light-colored paint has a greater absorptance of solar radiation than other colors of paint
C. The emissivity of white or light-colored paints is larger than that of other paints
D. White or light-colored paint has a lower emissivity than other colors of paint
微信支付 
支付宝支付