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1. What is the heat conduction?
A: The energy from one objects conversion or transfer to another object. 2. What is the three ways of heat conduction?
A: ①Conduction ② Convection ③Radiation 4. What’s the different between these three ways of heat conduction?
A: Conduction: energy transfer from high temperature solids to low temperature solids directly. Convection: As the temperature and density of gas and liquid is different from others, they can use gas or liquid heat conduction, this conduction can use power of fan and pump, can also be carried out by the forces of nature.
Radiation: When a radiation materials impact another material, if the radiation is absorbed, it will be converted into heat. These Kinds of heat source and receiver may be gases, liquids or solids, but the conversion level depends on the heat transparency of receiver. For example: the higher transparency of receiver, the lesser heat conversion.
5. For partial painting, what is the best way of heat conduction?
A: Infrared 6. What is infrared? 7. What is the three types of infrared radiation ?
A: The long-wave radiation, medium wave radiation, short-wave radiation 9. For infrared radiation partial painting, which wave band is the best one?
A: The best one is short-wave infrared radiation, the shorter the wavelength, the higher the temperature.
10. What’s the relationship between shortwave infrared radiation and object?
A: Transparency 11. What is the relationship between them?
A: The higher the transparency of objects, the less heat conversion. 12. What’s the reason of shortwave infrared used for painting heat?
A: ① Since the rules for control painting radiation was set forward, water-based paints and high solid paints are more and more popular, but these new type of paint need long drying time than traditional paint. ② shortwave infrared can pass through the wet surface, drying from the bottom to the top, so paint not easy to wave and burst.
③ short-wave infrared heater reduced baking time , meanwhile improve the quality of painting.
13 what’s the advantage of short-wave infrared heater compared with other baking methods?
A: ① a reduction of organic solvents in the paint drying time
② reduce the water in drying time ③ switch immediately without preheating and cooling-off period ④ higher quality and cost saving. ⑤ Due to drying is focused on repairing regional inside of whole car body, saving energy. ⑥ high quality ⑦ reduce required the thermal emission |
