Abstract
An instrument has been developed for measuring heat flux in the range 1-80 kW m-2. It is of robust construction, suitable for outdoor use and designed so that it can be mounted flush with the surface to which the heat transfer is required to be measured. The output of the instrument is nearly proportional to heat flux and the sensitivity is sufficient to enable a change in heat flux of 1 kW m-2 to be detected. By using the heat flux meter with and without an infrared transmission window, values of both the radiated and convected heat transfer can be obtained. The instrument is not very sensitive to draughts even without the transmission window, but with it the output is rendered completely unaffected by draught for all practical purposes.
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