diameter pipe as shown in the figure, the critical If a foam insulation is added to a 4 cm outer diameter pipe as shown in the figure, the critical radius of insulation (in cm) is Foam Kroam = 0.1 W/mK %3D
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- Find the minimum amount of diameter for the insulation of a spherical water tank? Radius of the tank is 10 m, thermal conductivity is 25 W/(m^2*K) and convective coefficient is 5 W/(m*K)A 50-cm-diameter pipeline in the Arctic carries hot oil at 30◦C and is exposed to a surrounding temperature of −20◦C. A special powder insulation 5 cm thick surrounds the pipe and has a thermal conductivity of 7 mW/m · ◦C. The convection heat-transfer coefficient on the outside of the pipe is 9 W/m2 · ◦C. Estimate the energy loss from the pipe per meter of length. (Please give step-by-step solution)Calculate the R-factor (film resistance) for the following situations: (a) windblowing over a wall, h = 5 88 W⁄m2 ⋅K, and (b) still air inside a room near awall, h=1.47 Wm2 ⋅ K.
- A 10 cm diameter pipe is covered by 2 layer of logging. the inside layer is 4 cm thick and has a coefficient of thermal conductivity of 0.08 w/m-k. the outside layer is 3 cm thick and has coefficient of thermal conductivity of 0.15 w/m-k. the steam main conveys steam a pressure of 1.7 mpa with 25 C superheat. the outside temperature of the lagging is 27 C. if the steam main is 30 m long, determine the interface temperature of the lagging and overall coefficient of heat transfer based on outside area.A 2 cm thick steel pipe (thermal conductivity 43 W/[m °C]) with 6 cm inside diameter is being used to convey steam from a boiler to process equipment for a distance of 40 m. The inside pipe surface temperature is 115°C, and the outside pipe surface temperature is 90°C. If there is 600kW of heat loss, what is the thickness of the pipe?4.) A 15-cm-diameter steam line carries saturated steam at 6 MPa and is located in a tunnel with stagnant air with a temperature of 50oC. The outside unit convective coefficient is 8.5 W/m2-K. The steam line is covered with 3 cm of 85% magnesia insulation. It is decided to reduce the heat loss by one-half. How much 85% magnesia insulation is required? Neglect thermal resistance of pipe and inside surface.
- A 20 cm diameter pipe (? = 0.8) is placed in a brick duct (? = 0.9) made of square section with dimension of 30 cm. The temperature of the pipe is 200oC while the temperature of the brick duct is 20oC. Calculate the rate of heat transfer (W) between the pipe and the duct.Consider a composite wall made up of three separate walls and convective boundary conditions on each side, like so: a) Write the equation for total thermal resistance of the wall. b) If ? = 3m x 2m, L1, L2, and L3 = 1m, 0.5m, and 2m respectively, k1, k2, k3 = 400, 4, and 80 W/mk respectively, T∞1, T∞2 = 450 and 25 ̊C respectively, and h1, h2 = 40 and 200 W/mk respectively, what is the total thermal resistance? c) Given your answer to a and b, what is the junction temperature between the 1st and 2nd wall? d) What is the junction temperature between the 2nd and 3rd wall? e) What is the surface temperature of the end of the 3rd wall?A 50-cm-diameter pipeline in the Arctic carries hot oil at 30°C and is exposed to a surrounding temperature of −12°C. A special powder insulation 5 cm thick surrounds the pipe and has a thermal conductivity of 7 mW/m°C. The convection heat transfer coefficient on the outside of the pipe is 9 W/m2°C. Estimate the energy loss from the pipe per meter of length.
- A horizontal pipe having a surface temperature of 67 °C and diameter of 20 cm is buried at a depth of 1 m in the earth at a location where k = 1.8 W/m-°C. The earth surface temperature is 15 °C. Calculate the shape factor if the pipe length is 10 m.A transformer is to be cooled via forced air convection. To increase the effectiveness of thecooling, Alloy 1095 cast aluminum fins are attached to the top of the transformer overwhich air is blown (negligible thermal contact resistance between the transformer and thefins). The fins are 2 cm thick and 7 cm long and span the entire length of the transformer,and the transformer is 7 cm wide and 10 cm long. Air leaves the cooling fan at 25°C .a) Decide how to model the fins before performing any real analysis. Youare willing to accept some error in your analysis and so you will either model thefins as having adiabatic tips or being infinitely long. You expect the average convectioncoefficient over the heat transfer surfaces for this system to be around 50 W m2– K⁄ .Which tip condition should you use for the fins in your analysis? b) Modeling the transformer as being isothermal, determine the average convectioncoefficient over the heat transfer surfaces. Account for heat transfer from the…Pin fins are provided to increase the heat transfer from a hot surface. The perimeter of each fin is 4cm and its cross section area is 2 cm². The thermal conductivity of fin material is 200 W / mK. The fin base temperature is 230 ° C, the ambient air temperature is 30 ° C and the heat transfer coefficient is 20 W / (m²K). The fins are assumed of negligible end loss Which of the following arrangements will give higher heat transfer rate? (1) 6 fins of 10 cm length. (2) 12 fins of 5 cm length