please solve the following problem 1. One way of measuring the thermal conductivity of a material is to sandwich anelectric thermofoil heater between two identical rectangular samples of the materialand to heavily insulate the four outer edges, as shown in the figure. Thermocouplesattached to the inner and outer surfaces of the samples record the temperatures.During an experiment, two 0.5-cm thick samples 10 cm x 10 cm in size are used. Whesteady operation is reached, the heater is observed to draw 25 W of electric power, athe temperature of each sample is observed to drop from 82°C at the inner surface tc74°C at the outer surface. Determine the thermal conductivity of the material at theaverage temperature.SamplesWattmeterSourceInsulationInsulation05cmResistanceheater

Here is the step-by-step explanation: Step 1: Understand the heat conduction equation:The heat…

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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 8.35P

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1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. National Institute of Standards and Technology's Cryogenic Division; the superinsulation has an effective thermal conductivity of 0.00012 W/m K. If the outside temperature is on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.
2. Make a diagram and show the step-by-step process. Do not use shortcut methods. Make it as detailed as it can be. Encode (not hand-written)!
2. In an experiment to measure the thermal conductivity of beef was formed into a square section block 5 cm x 5 cm and 1 cm thick. The edges of the block were insulated, and heat was supplied continuously to one face of the block at a rate of 0.80 W. The temperatures of each face were measured with thermocouples and found to be 28.5°C and 23.3°C, respectively. What is the thermal conductivity of beef?
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Question No. 12: . a) What is critical thickness of insulation? Explain its importance and derive the expression to calculate critical thickness of insulation for a cylinder. b) A composite wall consists of 2.5 cm thick Copper plate, a 3.2 cm layer of asbestos insulation and a 5 cm layer fibre plate. Thermal conductivities of the materials are respectively 355, 0.110 and 0.0489 W/m.K. The temperature difference across the composite wall is 560°C on one side and 0°C on the other side. Find the heat flow through the wall per unit area and the interface temperature between asbestos and fibre plate.
1a.A copper slab (k = 372 W/m .K) is 3mm thick . it is protected from the corrosion on each side by a 2 mm thick layer of stainless steel ( k = 17 W/m .K). The temperature is 40°C on one side of this composite wall and 100°C on the other. Find the temperature distribution in the copper slab and the heat conducted through the wall. Given: ksteel = 17 W/m .K kcopoer = 372 W/m .K Steel Copper T2 Steel T1 = 40°C T3 T4 = 10°C 2mm 3mm 2mm
A boiler furnace wall must have a heat loss no greater than 700 Btu/hr~ft2 and is madeof a material with a thermal conductivity of 0.60 Btu/hr~ft~F. The inner wall surfacetemperature is '2000°F, and the outer surface temperature is 800°F. What wall thick~ness is required?
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A hollow square box is made from 1ft^2 sheets of a prototype insulating material that is 0.75 inches thick. A 120W electrical heater is placed inside the box. Over time thermocouples attached to the box show that the interior and exterior surfaces of one face have reached the constant temperatures of 150 degrees and 90 degrees. What is the thermal conductivity?
Please answer question 1 please show me step by step.
1. A wall 2 cm thick is to be constructed from material that has an average thermal conductivity of 1.3 W/m C. The wall is to be insulated with material having an average thermal conductivity of 0.35 W/m C, so that the heat loss per square meter will not exceed 1830 W. Assuming that the inner and outer surface temperatures of the insulated wall are 1300 and 30 C, calculate the thickness of insulation required.
6. Make a diagram and show the step-by-step process. Do not use shortcut methods. Make it as detailed as it can be. Encode (not hand-written)! DO NOT COPY CHEGG'S ANSWER

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