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What is the difference between heat transfer coefficient and thermal conductivity?
The coefficient of heat transfer in the past that the total heat transfer coefficient. The current national standard specification unified name for the heat transfer coefficient. Heat transfer coefficient K value, refers to the steady heat transfer conditions, the palisade structure on both sides of the air temperature of 1 degrees (K, ℃), 1 hours by 1 square meter area of heat transfer, the unit is the watts per square metre, degrees (W / ㎡, K, K here can be substituted for ℃).
Coefficient of thermal conductivity is refers to under the condition of steady heat transfer, 1 m thick material, the surface temperature on both sides to one degree (K, ℃), within an hour, by 1 square meter area of heat transfer, the unit for W/m, c (W/m K, here for K can be substituted for ℃). Coefficient of thermal conductivity and material composition, density, moisture content, temperature and other factors. Amorphous structure, the low density material, small thermal conductivity. The moisture content of materials, the temperature is lower, smaller thermal conductivity. The low coefficient of thermal conductivity of materials usually referred to as thermal insulation material, and the coefficient of thermal conductivity in the 0.05 w/m, the following material is called the efficient thermal insulation material.