You are required to measure the temperature of exhaust gas from a petrol engine. During the measurement, the thermocouple reads 400°C while the temperature of the exhaust pipe is 350°C. The emissivity of the thermocouple is 0.7 and the convection heat transfer coefficient of the flow over the thermocouple is 90 W/m²-K. Calculate the actual temperature of the exhaust gas.

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 8.39P
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Question 1
An RTD is inserted into a Wheatstone bridge. The other resistors have values of 100 Q. The lead
resistance is 2 Q and the supply voltage is 4 V. Draw the circuit and calculate the output voltage
at temperature 70°C neglecting the effect of lead wires.
Question 2
You are required to measure the temperature of exhaust gas from a petrol engine. During the
measurement, the thermocouple reads 400°C while the temperature of the exhaust pipe is 350°C.
The emissivity of the thermocouple is 0.7 and the convection heat transfer coefficient of the flow
over the thermocouple is 90 W/m²-K. Calculate the actual temperature of the exhaust gas.
Transcribed Image Text:Question 1 An RTD is inserted into a Wheatstone bridge. The other resistors have values of 100 Q. The lead resistance is 2 Q and the supply voltage is 4 V. Draw the circuit and calculate the output voltage at temperature 70°C neglecting the effect of lead wires. Question 2 You are required to measure the temperature of exhaust gas from a petrol engine. During the measurement, the thermocouple reads 400°C while the temperature of the exhaust pipe is 350°C. The emissivity of the thermocouple is 0.7 and the convection heat transfer coefficient of the flow over the thermocouple is 90 W/m²-K. Calculate the actual temperature of the exhaust gas.
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