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
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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
The main reason why air-conditioner indoor machines can have multiple colors is
A. The difference in emissivity of different colors paints at room temperature is small
B. The emissivity of different colors paints varies greatly at room temperature
C. The absorptance of different colors paints to visible light is quite different at room temperature
D. The difference in the absorptance of different colors paint to visible light at room temperature is small
The heat dissipation method of exterior surface of indoor radiator in the northern area in winter is
A. Natural convection heat transfer
B. Radiative heat transfer
C. Mixed convection heat transfer (natural convection heat transfer and forced convection heat transfer)
D. Compound heat transfer (natural convection heat transfer and radiation heat transfer)
The reason why the extraction thermocouple with heat shelter can improve the accuracy of temperature measurement is that
A. The extraction thermocouple with heat shelter greatly reduces the radiative heat transfer on the surface of the thermocouple
B. The extraction thermocouple with heat shelter greatly increases the radiation heat transfer on the surface of the thermocouple
C. The extraction thermocouple with heat shelter increases the convective heat transfer coefficient of the thermocouple surface
D. The extraction thermocouple with heat shelter greatly reduces the convection heat transfer on the surface of the thermocouple
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