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
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text: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
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