Homework Answers
Thermocouple is a device that is used to measure the temperature of the object. Thermocouple is made by connecting two wires of different material with each other. One junction acts as hot junction and other is cold junction.
To calibrate the thermometer, a hot junction is initially dipped into the vessel containing ice. An another temperature measuring device is present over there for example a thermometer. The respective temperature of thermometer is noted along with potential difference measured across two junctions of thermocouple. Then the readings of temperature are recorded at each increment of 5 degree celcius or 1 degree celcius depending upon the accuracy required. The subsequent potential difference is also noted down. Then the graph is plotted in between measured voltage and the temperature to get calibration curve
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I what is thermocouple calibration write the method used to measure in detail By Bath water...
A thermocouple at 20 °C is suddenly placed into a 60 °C water bath. The thermocouple...
A thermocouple at 20 °C is suddenly placed into a 60 °C water bath. The thermocouple is covered by a brass sphere that is 10 mm in diameter. The density of brass is 8500 kg/m3 and the specific heat is 0.385 kJ/kg-°C. The heat transfer coefficient is determined to be 1900 W/m2 °C. For the same system as the previous question, determine the 90% rise time. For the same system, calculate the time it would take to reach 40 °C.
Describe how a thermocouple can be used to measure the temperature of an object.
Describe how a thermocouple can be used to measure the temperature of an object.
A thermocouple is used to measure the temperature of hot air flowing in a duct whose...
A thermocouple is used to measure the temperature of hot air flowing in a duct whose walls are maintained at Tw = 500 K. The thermocouple shows a temperature reading of Tt h = 850 K. Assuming the emissivity of the thermocouple junction to be 0.6, and the convection heat transfer coefficient to be 60 W/m2 · K, (a) draw the thermal resistance network, and (b) determine the actual temperature of the air.
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna....
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna. The sauna is unbearably hot and a person can only stay for 20 seconds, during which the temperature reading keeps on changing and a steady temperature is not reached. Leaving the thermocouple reader in the sauna for extended period of time has been deemed too risky for an electronics device Fortunately, a transient heat transfer model can be used to extract the temperature in...
A calibration curve plotting E vs. pCd is used to measure the concentration of Cd2 in...
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Solve the differential equation analytically Suppose a thermocouple is to be used to measure the temperature of a hot gas flowing through a duct. The thermocouple junction is initially at ambient tem...
Solve the differential equation analytically
Suppose a thermocouple is to be used to measure the temperature of a hot gas flowing through a duct. The thermocouple junction is initially at ambient temperature Ti-25°C before it is inserted into the gas stream. Hot duct wall Tsur 400°C Gas stream Junction, Tt) 1,-25°C, D p 8500 kg/m3 T 200°C 0.7 mm 400 Jkg.K Approximating the thermocouple junction as a sphere and using the lumped capacitance model, an energy balance on the thermocouple...
506H3 HEAT TRANSFER APPLICATIONS Q4. a) When thermocouples are used to measure temperatures, there are various...
506H3 HEAT TRANSFER APPLICATIONS Q4. a) When thermocouples are used to measure temperatures, there are various sources of error that need to be minimised. State and explain three possible sources and how you can minimise their effect. Please use diagrams for your [12 marks] answer b) A thermocouple is used to measure the temperature on the surface of a heated cylinder within a test rig. The reference junction is placed outside the test-rig and is maintained at a constant temperature...
4) Consider the schematic diagram of a thermowell/thermocouple which is used to measure temperature (T) of...
4) Consider the schematic diagram of a thermowell/thermocouple which is used to measure temperature (T) of a fluid. The measured temperature Tm is recorded via thermocouple leads. The energy balance equation is given below. T. mc = UAT-T...) dt Here, m is the mass of the fluid in the thermowell, C is the specific heat, U is the heat transfer coefficient and A is the area of the thermowell wall. Page 2 of 2 (a) Derive the transfer function between...
3. A thermocouple is used to measure the surface temperature of an object. The center of a thermocouple bead of diameter D-100 μm is positioned at a distance 10 μm from the surface of interest. The t...
3. A thermocouple is used to measure the surface temperature of an object. The center of a thermocouple bead of diameter D-100 μm is positioned at a distance 10 μm from the surface of interest. The two thermocouple wires, each of diameter d = 1 mm and length L-250 mm, are held by a large manipulator that is at a temperature of Tm-25 °C. The thermal conductivities of the Nicrosil and Nisil thermocouple wires are Kvic respectively. We can neglect...
Why is it not possible to directly measure the voltage on the thermocouple sensor? What is...
Why is it not possible to directly measure the voltage on the thermocouple sensor? What is the time constant of the temperature probe’s exponential decay? What do the parameters(tau) and a represent? How could the temperature drop acquisition be changed to improve the Labview best exponential fit model?
Describe how a thermocouple can be used to measure the temperature of an object.
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna. The sauna is unbearably hot and a person can only stay for 20 seconds, during which the temperature reading keeps on changing and a steady temperature is not reached. Leaving the thermocouple reader in the sauna for extended period of time has been deemed too risky for an electronics device Fortunately, a transient heat transfer model can be used to extract the temperature in...
Solve the differential equation analytically
Suppose a thermocouple is to be used to measure the temperature of a hot gas flowing through a duct. The thermocouple junction is initially at ambient temperature Ti-25°C before it is inserted into the gas stream. Hot duct wall Tsur 400°C Gas stream Junction, Tt) 1,-25°C, D p 8500 kg/m3 T 200°C 0.7 mm 400 Jkg.K Approximating the thermocouple junction as a sphere and using the lumped capacitance model, an energy balance on the thermocouple...
506H3 HEAT TRANSFER APPLICATIONS Q4. a) When thermocouples are used to measure temperatures, there are various sources of error that need to be minimised. State and explain three possible sources and how you can minimise their effect. Please use diagrams for your [12 marks] answer b) A thermocouple is used to measure the temperature on the surface of a heated cylinder within a test rig. The reference junction is placed outside the test-rig and is maintained at a constant temperature...
4) Consider the schematic diagram of a thermowell/thermocouple which is used to measure temperature (T) of a fluid. The measured temperature Tm is recorded via thermocouple leads. The energy balance equation is given below. T. mc = UAT-T...) dt Here, m is the mass of the fluid in the thermowell, C is the specific heat, U is the heat transfer coefficient and A is the area of the thermowell wall. Page 2 of 2 (a) Derive the transfer function between...
3. A thermocouple is used to measure the surface temperature of an object. The center of a thermocouple bead of diameter D-100 μm is positioned at a distance 10 μm from the surface of interest. The two thermocouple wires, each of diameter d = 1 mm and length L-250 mm, are held by a large manipulator that is at a temperature of Tm-25 °C. The thermal conductivities of the Nicrosil and Nisil thermocouple wires are Kvic respectively. We can neglect...
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