chapter  7
24 Pages

Radiation Heat Transfer

Diffuse-Gray Surfaces-The Net Radiation Method .................579 7.4.5 The Network Representation....................................................................................580

7.5 Gas and Particle Radiation...................................................................................................583 7.5.1 Radiative Transfer Equation.....................................................................................583 7.5.2 Radiative Properties of Gases and Particles ............................................................585

7.6 Radiation Thermometry........................................................................................................586 References ......................................................................................................................................588

Radiation heat transfer is important in furnaces, flames, high-temperature materials processing and manufacturing, solar energy utilization, cooling and insulation in space, and cryogenic systems. Typical furnaces include ethylene, vinyl chloride, styrene, and steam generation units. Thermal radiation is relevant to many industrial heating, cooling, and drying processes. Even at room temperature, heat transfer by radiation is often on the same order of magnitude as that by free convection. The main features of radiation that are distinct from conduction and convection are: energy can be transferred without an intervening medium; and energy transfer is not proportional to the temperature difference between surfaces, and is dependent upon the surface radiative properties, which are functions of wavelength and temperature.