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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
An iron-constantan thermocouple is placed in a moving air stream in a duct, as shown in Figure 8.42. The thermocouple reference junction is maintained at 212°F. The wall temperature, Tw, is 500°F, and the air velocity is 200 ft/s. The emf output from the thermocouple is 14.143 mV.
a. Determine the thermocouple junction temperature.
b. By considering recovery and radiation errors, estimate the possible value for total error in the indicated temperature. Discuss whether this estimate of the measurement error is conservative, and why or why not. The heat-transfer coefficient may be taken as 70 Btu/hr-ft2-°F.
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Figure 8.42

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