temperature value must be reasonably correct: at most %3 difference between measured and actual temperature values is allowed. Four thermocouples from different vendors are being tested. Relevant properties of these devices are listed below: Thermal conductivity Density 36 W/m*K 36 W/m*K 42 W/m*K 33 W/m*K Specific Heat 140 kJ/kg*K 120 kJ/kg*K 150 kJ/kg*K 160 kJ/kg*K Device Bead Diameter Thermocouple 1 Thermocouple 2 Thermocouple 3 Thermocouple 4 12000 kg/m3 10000 kg/m3 12000 kg/m³ 9000 kg/m3 0.9 mm 0.9 mm 1.2 mm 0.7 mm The experiment involves placing the thermocouple from air at 20 °C to air at 150 °C, and monitoring the time it takes for the measured values to reach 150 °C, which is the temperature value the thermocouple should read in this case. If the convection heat transfer coefficient of the air is 10 W/m2*K, which
temperature value must be reasonably correct: at most %3 difference between measured and actual temperature values is allowed. Four thermocouples from different vendors are being tested. Relevant properties of these devices are listed below: Thermal conductivity Density 36 W/m*K 36 W/m*K 42 W/m*K 33 W/m*K Specific Heat 140 kJ/kg*K 120 kJ/kg*K 150 kJ/kg*K 160 kJ/kg*K Device Bead Diameter Thermocouple 1 Thermocouple 2 Thermocouple 3 Thermocouple 4 12000 kg/m3 10000 kg/m3 12000 kg/m³ 9000 kg/m3 0.9 mm 0.9 mm 1.2 mm 0.7 mm The experiment involves placing the thermocouple from air at 20 °C to air at 150 °C, and monitoring the time it takes for the measured values to reach 150 °C, which is the temperature value the thermocouple should read in this case. If the convection heat transfer coefficient of the air is 10 W/m2*K, which
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.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.2DP
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