Abstract
The operational error in the heat flux measurements is theoretically investigated when the heat flux from a furnace wall to the environment is measured by a heat flux transducer. Change of the original heat flux, which is caused by placing a transducer on the furnace wall, is clarified by solving a three-dimensional heat transfer problem. The operational error is explicitly given by a simple equation taking into account the thermal properties of the furnace wall and the transducer. Numerical results are also provided for a typical application to industrial furnaces.
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