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/mK 36 W/mK 42 W/mK 33 W/mK Specific Heat 140 kJ/kgK 120 kJ/kgK 150 kJ/kgK 160 kJ/kgK 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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A thermocouple is used to measure the temperature T1. The thermocouple reference junction labeled 2 is at a temperature of 20°C. The voltage output is measured using a potentiometer and found to be 4.686 mV. What is T1 in degrees RK: if the temperature values are not in the table, you have to use interpolation. Select one: O a. 98 O b. 118 O c. 105 O d. 108 Previous page Next page
Thermocouples are devices used to measure temperature of a given sample or the surroundingmedium. These devices feature a “bead”, which has a spherical shape, and produces voltage upon changein temperature. For an engineering application at a pharmaceutical company, thermocouple devices arebeing tested for their responsiveness, i.e. how fast it can detect temperature changes in the environment(surrounding air). The engineers at this company have specified design constraints for an idealthermocouple: it must detect temperature changes no later than 1.5 minute, and the reportedtemperature value must be reasonably correct: at most %3 difference between measured and actualtemperature values is allowed.Four thermocouples from different vendors are being tested. Relevant properties of these devices arelisted below: The experiment involves placing the thermocouple from air at 20 °C to air at 150 °C, and monitoring thetime it takes for the measured values to reach 150 °C, which is the…
A sphere (emissivity=0.42) of radius 25 cm is at 27 deg C. It's placed in a room with a temperature of 2 deg C. Match each item to a choice: How long will it take for the sphere to lose 1x10^6 Joules of energy? What is the rate of heat energy entering the sphere? Choices: : 151.4981 W : 8.236 hrs : 6.832 hrs : 44.5303 W : 3.268 hrs : 6.238 hrs : 106.9678 W
A J-type thermocouple is used to measure the unknown steady-state temperature of a liquid. The sensor outputs a voltage of 2.532 mV. Using Equation 2 and Table 1.2, determine the unknown temperature. Show all calculations and assume the thermocouple is referenced to 0 °C. T = a₁ + a₂V + · ...+ a₂V² a a₁ 0.000 000 1.978 425 x 10-² -2.001 204 x 10¹7 1.036 969 x 10-¹1 -2.549 687 x 10-16 3.585 153 x 10-21 -5.344 285 x 10.26 5.099 890 x 10:³1 Table 1.2 -J-type thermocouple polynomial coefficients over the range of 0°C to 760°C ± 0.04°C 8₂ a3 a4 (2) as as a7
A chamber of unknown volume is filled with an unknown amount of ideal gas. A cylinder with an open bottom and calibrated volume is connected to the chamber and is closed with a movable piston. A gas pressure sensor is also mounted on the chamber as shown in the figure. The whole experimental setup is kept at a constant temperature of 300 K. Doris moves the piston from mark 0 to mark 200 mL in steps of 50 mL and records the corresponding pressure in the chamber (see the table below). She moves the piston very slowly and waits several minutes before recording the pressure values. VCyl(mL) P(105N/m2)) 0 4.35 50 3.85 100 3.50 150 3.15 200 2.90 Determine the volume of the chamber using Doris's data in the table. (Note: This is a problem that requires linearization of data.) Determine the number of moles of gas. (Note: This is a problem that requires linearization of data.)
Annealing is a critical process in semiconductor manufacturing where silicon wafers get rapidly heated to get temperatures using powerful infrared heaters. Annealing helps to reduce defects in materials after implantation or deposition processes. a) You have been asked to design a temperature sensor an annealer with a range of up to 1500°C.Select a suitable thermocouple from the table below and give an explanation for your choice. 80 E 70 60 K 50 40 -C 30 20 10 0. 500 1000 1500 2000 2500 Temperature ("C) b) To record the temperature, you use a microcontroller with an ADC. The ADC is referenced to a 2.048V reference voltage source. To make use of the entire range of the ADC, what gain does the amplifier require for your chosen Thermocouple? c) You want to read the temperature with a resolution of 0.5°C. What is the minimum number of bits that your ADC requires? d) The thermocouple has a time constant, t, of 300ms. If the annealer heats from room temperature (20°C) to 820°C. What…
i. Derive the linear and quatratic approximation of the below resistance temperature readings(temperature from 40 °c to 80 °c). (. ii. find out the resistance of RTD at a temperature of 200°c using linear approximation? ( Temperature 40 45 50 55 60[TO] 65 70 75 80 Resistance ohm 115.239 120.521 167.096 254.966 384.13 554.587 766.34 1019.38 1313.724
The objective of this question is to give the missing information about the reading of thermocouple type J. The temperatures are in degrees Celsius. The temperature is 100 degrees and the reference is 50. The reading voltage is (mV) Choose... The temperature is 95 and the reference is zero, so the voltage is (mV) Choose... The reference is 30 and the reading voltage is 8.687 mV, The temperature is Choose... + The temperature is 256 degrees and the reference is 75 degrees. The reading voltage is (mV) Choose... +
A K- type thermocouple is used to measure the temperature in a heating process. The length of the bare material is 100mm and thickness is 1.5mm. Find the time constant of the bare material. Турe of Thermo-Material couple K ( Q W/m- (kg/m³)| k) |(J/Kg- oc) J Iron- Constantan 46 8535 345 Kromel- Alumel 35 8738 380 T Copper- Constantan 160 8902 316 Cromel - Contantan 33 8825 336 IN Nicrocil- Nisil 34 8702 376 Pt(30%)Rhodium - B 19 15718 56 Pt(6%)Rhodium Platinum(13%)Rodium 55 16628 99 Platinum Platinum(10%)Rodium - Platinum IS 52.9 16745 99 Time constant of the bare material is, T=
What are the types of temperature sensors / devices used in industrial applications? (Give atleast 5 thermocouple sensors).
5. For a slab with thickness 2 cm, the temperature is maintained at To and T₁ at x = 0 and x = L. When To 40 °C and T₂ 60 °C, a heat flux sensor measures the magnitude of the heat flux as 40 W/m². Assume that the thermal conductivity k is a linear function of temperature. a) If, when To -40 °C and T₁ = 80 °C, the same heat flux sensor measures the magnitude of the heat flux as 80 W/m², what is the temperature dependence of k? b) If, when To -40 °C and T₂ = 80 °C, the same heat flux sensor measures the magnitude of the heat flux as 100 W/m², what is the temperature dependence of k? c) If, when To=40 °C and T₂ = 80 °C, the same heat flux sensor measures the magnitude of the heat flux as 60 W/m², what is the temperature dependence of k? =
Task 3-a: If you have four instruments used to measure a temperature of 50.02 C inside the factory. However, the instruments gave different readings for different trials as follows: Instrument 1 20 30 40 50 60 70 80 51 49 Instrument 2 49 49 49 49 49 49 49 49 49 Instrument 3 48.01 48.03 49.02 49.01 50.00 48.02 47.09 47.05 47.80 Instrument 4 17.01 17.02 17.09 17.03 17.01 17.03 15.09 19.02 17.00 1. Define the resolution of an instrument. 2. Define the sensitivity of an instrument, then explain how the sensitivity of an instrument can be calculated. 3. Define the accuracy of an instrument system and explain using your own words how the accuracies of different instruments are compared. 4. Define the precision of an instrument system and explain using your own words how the precisions for different instruments are compared.