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A heat flux transducer was calibrated on a guarded-end pipe tester and inserted under the jacket of an outdoor steam-heated pipe. The pipe was designed to allow the condensate to be collected and measured. The heat loss was calculated from the condensate volume and the thermal properties of steam. When compared with the heat loss measured by the transducer, agreement was within 6%.
The transducer output was recorded continuously over a one-year period. The average was obtained over a 24-h period to allow for comparison with average ambient weather conditions. Typically, the transducer output was inversely proportional to the average ambient temperature. Increasing wind speed reduced the surface temperature of the pipe and increased the average transducer output (heat loss).
Data are presented showing typical readings averaged over 1 h, 24 h, and two months. The data indicate that a heat flux transducer can be used to measure heat loss adequately in an industrial environment.
heat flux transducers, sensor, insulation, temperature, heat loss, steam, millivolt
Plant manager, Louisiana Pacific Corporation, Tucker, TX