Radiative component and combined heat transfer in the thermal calculation of finned tube banks

For mole exact calculation of combined heat transfer in the case of finned tube banks (e.g., in the convective section of a furnace), the radiative he at transfer cannot be neglected. A new method for relatively simple calcula tion of total heat flux (convection + radiation + conduction in fins) is fu lly compatible with that for bare tube banks/bundles developed earlier. It is based on the method of radiative coefficients. However, the resulting va lue of heat flux must be corrected due to fin thickness and especially due to the fin radiative influence. For this purpose the so-called multiplicato r of heal flux was introduced. The applicability of this method has been de monstrated on a tubular fired heater convective section. A del eloped compu ter program based on the method has also been used for an analysis of the i nfluence of selected parameters to shaw the share of radiation on the total heat flux.