Heat Transfer - Radiation, Convection And Conduction

Reflected Refracted Transmitted Absorbed Black radiation Full radiation Total radiation All of these Directly proportional to the surface area of the body Directly proportional to the temperature difference on the two faces of the body Dependent upon the material of the body All of the above Moisture Density Temperature All of the above Emissivity Transmissivity Reflectivity Intensity of radiation Blast furnace Heating of building Cooling of parts in furnace Heat received by a person from fireplace Absorptive power Emissive power Absorptivity Emissivity I.C. engine Air preheaters Heating of building in winter None of the above Cold body to hot body Hot body to cold body Smaller body to larger body Larger body to smaller body Improve heat transfer Provide support for tubes Prevent stagnation of shell side fluid All of these

Irregular surfaces

Nonuniform temperature surfaces

One dimensional cases only

Two dimensional cases only

Radiant heat is proportional to fourth power of absolute temperature

Emissive power depends on temperature

Emissive power and absorptivity are constant for all bodies

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body