The thermal resistance of a medium represents the resistance of that medium against heat transfer.
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- A plane wall 15 cm thick has a thermal conductivity given by the relation k=2.0+0.0005T[W/mK] where T is in kelvin. If one surface of this wall is maintained at 150C and the other at 50C, determine the rate of heat transfer per square meter. Sketch the temperature distribution through the wall.1.77 Explain each in your own words. (a) What is the mode of heat transfer through a large steel plate that has its surfaces at specified temperatures? (b) What are the modes when the temperature on one surface of the steel plate is not specified, but the surface is exposed to a fluid at a specified temperature?Shape Factor Conduction Problem A cylindrical pipeline that is used for the transport of crude oil is buried in the soil horizontally such that its centerline is 1.5 m (z) below the surface. The pipe has the outer diameter of 0.5 m (D) and is coated with a 100 mm thick layer of glass insulation on the outside. Assume that heated oil at 120 °C flows through the pipe and the soil surface temperature is at 0 °C (T2). The soil thermal conductivity is known as 0.5 W/m-K, and the glass insulation thermal conductivity is known as 0.07 W/m-K. What is the rate of heat loss per unit length of the pipe (W/m)? Soil Glass insulation Oil, T
- Which of the following statements are correct in the context of thermal conductivity? (Check all that apply.) Check All That Apply The thermal conductivity of gases is proportional to the square root of absolute temperature. The thermal conductivity of liquids is proportional to the square root of absolute temperature. The thermal conductivity of most liquids decreases with increasing temperature. The thermal conductivity of most liquids increases with increasing temperature.What happens to heat transfer per unit time in conduction heat transfer as thermal conductivity decreases?What will be the rise in temperature in 30 minutes of a block of copper of 500-gram mass if it is joined to a cylindrical copper rod 20 cm long and 3.0 mm in diameter when a temperature difference of 80 degree Celsius is maintained between ends of the rod? The thermal conductivity of copper is 1.02 cal/cm2-sec-°C/cm (neglect heat losses). Please include FBD
- Select correct statements about the comparison between the science of heat transfer and the science of thermodynamics O We can use either one to calculate the time of cooling or heating processes One is about the non-equilibrium situation, and another one deals with equilibrium. O One is about the rate of heat transferred, and another one is about the amount of heat transferred O Time does not play any role in thermodynamics, but it does in heat transferThermodynamics A hollow cylindrical insulation of inside diameter 0.2 m and outside diameter 0.4 m conducts heat radially. If another layer of insulation of the same material of thickness of 0.4 m is added, the heat flow wil be changed by what ratio?Determine the heat conduction of a boiler if you are given the following data: The thickness of the boiler is 15 cm, the T1 is the temperature of the water is 25°C and the T2 of the steam is 110°C, the thermal conductivity The boiler material is iron (use presentation table), the boiler area is 4.5 m^2
- 4) In an experiment to find the thermal conductivity, a metallic rod of diameter 25 mm is placed in a furnace such that its one half is inserted into the furnace and other half is projected out in a room at 300 K. Once the steady state reached, the temperatures measured between two points 76 mm apart were 399 K and 364 K, respectively. Taking a convection coefficient of 22.7 W/m 2 – K, find the thermal conductivity of the metal.A solid steel cube is stored in a freezer, where the temperature is −20.0 ̊C. While the cube is in the freezer, you measure its side length (L) to be 1.75050 meters. The cube is then placed outside for a long time, so that the temperature of the cube reaches the temperature of the air outside. As a result, the side length increases to 1.75170 meters due to thermal expansion. The coefficient of linear expansion for steel is 12.0×10−6 ̊C−1. (a) What is the temperature of the air outside? Give your answer in degrees Celsius ( ̊C). (b) What is the volume of the cube when its temperature is 20.0 ̊C? Give your answer in cubic meters (m3).Identify the correct statement a. The thermal resistance of conduction decreases with increase in outer radius of the hollow cylinder O b. The thermal resistance of conduction is unpredictable with change in outer radius of the hollow cylinder O c. The thermal resistance of conduction increases with increase in outer radius of the hollow cylinder o d. The thermal resistance of conduction remains same with change in outer radius of the hollow cylinder