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Calculating Radiated Heat Loss in Dwellings, Ovens and Other Structures - A Quick and Dirty Method

From Flir Systems Incorporated
 

 
The first and most important condition for this calculation is the 'apparent' temperature of the energy lost calculation. Many different building materials are used in the construction of structures and normally these materials are medium to highly emissive. However for the purposes of this paper the apparent temperature is only needed for the calculation. Therefore, the Emissivity on the camera or thermograph will always be set at 1.00 E. The actual temperature is not valid. Often thermographers will use an air temperature reading to make calculations for radiated heat loss. However air is only able to transmit infrared. This tool allows the thermographer to use the nearest reference temperature of an object in infrared to enable the radiated power to be calculated. Thermometers are very unreliable for measuring temperature as they are not calibrated to the same accuracy as the camera. As well, radiated temperatures are much different than air temperature and it is radiated temperatures which are of interest.
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Thermal imagers detect heat patterns in the infrared wavelength (1 micron to 100 micron) spectrum. Search by Specification | Learn more about Thermal Imagers
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