Problem 9-1: An iron-constantan thermocouple is placed in a moving air stream in a duct, as shown in the figure below. The air flows at 70 m/s. The emissivity of the thermocouple is 0.5 and the recovery factor is 0.6. The wall temperature 300°C. The thermocouple reference junction is maintained at 100° C. The emf output from the thermocouple is 16 mV. I w - 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 100 W/(m² K). T = 260°C w Air U = 200 ft/s Tref Voltage
Problem 9-1: An iron-constantan thermocouple is placed in a moving air stream in a duct, as shown in the figure below. The air flows at 70 m/s. The emissivity of the thermocouple is 0.5 and the recovery factor is 0.6. The wall temperature 300°C. The thermocouple reference junction is maintained at 100° C. The emf output from the thermocouple is 16 mV. I w - 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 100 W/(m² K). T = 260°C w Air U = 200 ft/s Tref Voltage
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter8: Natural Convection
Section: Chapter Questions
Problem 8.3DP
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