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Heat and Mass Transfer

Excel Workbooks

Planck’s Law for Spectral Blackbody Emissive Power

UPDATED: 10/04/2022

This workbook computes and displays the spectral blackbody emissive power for a number of source temperatures.  It allows the user to display the spectral blackbody emissive power for a particular temperature and evaluates the integral over a wavelength range selected by the user (replicating the tabulated blackbody radiation functions). (See the cyan-colored lines in the figure below.) Another sheet is this workbook includes tabulated data for the spectral transmissivity of two types of glass, one of them a standard glass, the other a “low-E” (low-emissivity) glass. The function for blackbody emissive power, this tabulated data and Simpson’s Rule may be used to find the total transmissivity of the two glasses.


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