Heat Flux Indicator.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes an inexpensive passive heat flux sensor and recording device for measurements in fires or other hot environments comprising a pair of small spring steel strips of different thickness, heat treated to maximum hardness. The strips are fastened together back-to-back with asbestos paper insulation between them, or they are mounted side-by-side on a piece of asbestos millboard. After immersion in a fire the two steel pieces are tested for Rockwell C hardness, which is referred to a set of charts prepared with the aid of a computer program. The charts give the average heat flux and the time from beginning of exposure to approximately the maximum temperature of the steel pieces. It is also possible to calculate the approximate flame temperature from the data.
- Safety Engineering
- Test Facilities, Equipment and Methods