Explain the meaning of heat transfer and its concepts.
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Discussions: Use illustrations if necessary.
1. Explain the meaning of heat transfer and its concepts.
2. Enumerate and discuss the different modes of heat transfer and their applications.
3. Explain the concept of thermal resistances and their limitations.
4. Explain the concept of thermal contact resistance and their significance on heat
transfer of walls.
5. Explain the concept of critical radius of insulation on spherical and cylindrical walls.
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- 1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.43. Explain the concept of thermal resistances and their limitations.4. Explain the concept of thermal contact resistance and their significance on heattransfer of walls.5. Explain the concept of critical radius of insulation on spherical and cylindrical walls.Question 5: A copper bar 35 cm long, with square cross-section 2 cm x 2 cm is fitted with a resistive heater at one end, and a large heat sink at the other. The bar itself is ideally thermally lagged. (i) (ii) Sketch how you think the two thermometers would behave when the heater is switched on; (ii) Calculate the thermal conductivity if in the steady-state, T1=64.7 deg C and T2=40.0 deg C. Hint: rate of flow of heat = k*A*AT/X V=6 V, I=2.5A heater T1 25 cm T2 Heat sink
- Thermal Conductivity of Skin" Design experiments and calculate heat transfer coefficients/thermal conductivity (k)An insulation layer of 20 mm thick refractory material is placed on top of a layer of mineral wool to insulate a hollow, spherical steel ball with an outside diameter of 60 mm and an internal diameter of 50 mm wool. The table below lists the thermal conductivities: Substance a. 6.0 mm above Steel Refractory Mineral wool b. 6.1 mm k (W/m-K) c. 6.2 mm 48 While the outside temperature is 30 °C, the temperature within the steel is 200 °C. Heat effects from convection and radiation are disregarded. Find the needed thickness of the mineral wool if the heat loss is 50 W. 0.346 0.047 d. 6.3 mm e. No to all of theDiscuss the heat transfer via mode of conduction and relate it to actual application in the field of mechanical engineering discipline.
- 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.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?Please provide accurate answer with proper steps The wall of the furnace is 30.48 mm thick and is insulated from outside. Thermal conductivity of the wall material is 0.1 W/m K and the insulation material is 0.01 W/m K. The furnace operates at 650 0C and the ambient temperature is 30 0 Allowable temperature on the outer side of the insulation is 1000C. Determine the overall heat transfer by conduction per unit area occurring across a furnace wall made from clay. If the air side heat transfer coefficient is 0.4 W/m2 K, calculate the minimum insulation thickness requirement.
- 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 explain temperature dependence of thermal conductivity including interaction mechanism ?a) A house walls that are 24 cm thick and have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The walls’ surface area is 900000 cm2 and their inside surface is at 22°C, while their outside surface is at 6°C. (Thermal conductivity of glass wool is 0.042 W/m°C) (i) Calculate the rate of heat conduction through house walls? Answer for part 1 (ii) How many 100W room heaters would be needed to balance the heat transfer due to conduction? (approximate number) Answer for part 2 b) A spherical infrared heater of radius 6.35 cm has an emissivity of 0.83. What temperature must it run at if the required power is 0.44 kW? Neglect the temperature of the environment. (Stefan's constant = 5.67*10-8 Wm-2K-4) The temperature of the heater in Celsius =