2) Urethane (k = 0.026 W/m-K) is used to insulate the sidewall and the top and bottom of a cylindrical hot water tank. The insulation is 40 mm thick and is sandwiched between sheet metal of thin-wall construction. The height and inside diameter of the tank are 2 m and 0.8 m, respectively. The tank is in ambient air with T = 10 °C and h = 10 W/m²-K. If the hot water maintains the inner surface at 55 °C, and energy costs amount to $0.15 per kWh, what is the daily cost to maintain the water in storage? Argue that the thermal resistance of the tank wall is negligible. What does this say about the temperature drop across the tank wall?
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- To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D;, 1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D;, 2 = 250 mm and wall thickness t, = t;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (kp = 0.03 W/m-K) between the two pipes does not exceed its maximum service temperature of T, max = 70°C. The ocean water is at T,o = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m²-K. The convection coefficient associated with the flowing crude oil is hị = 450 W/m²-K. (2) It is proposed to enhance the performance of the…To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 35 W/m-K) has an inside diameter of D; 1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of = 250 mm and wall thickness to = tj. Determine the maximum allowable crude oil temperature to ensure the Di,2 = 0.0425 W/m-K) between the two pipes does not exceed its maximum service = -5°C and provides an external convection heat transfer polyurethane foam insulation (kp temperature of T, р, max = 70°C. The ocean water is at T o, 0 coefficient of ho 500 W/m2.K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m2-K. (2) It is proposed to enhance the performance of…To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 40 W/m-K) has an inside diameter of D₁.I 150 mm and wall thickness t, = 20 mm while the outer steel pipe has an inside diameter of D₁,2 = 250 mm and wall thickness to = 1₁. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.0675 W/m.K) between the two pipes does not exceed its maximum service temperature of Tp. max = 70°C. The ocean water is at T = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m².K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m².K. (2) It is proposed to enhance the performance of the…
- To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D;1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D; 2 = 250 mm and wall thickness to = tj. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, between the two pipes does not exceed its maximum service temperature of T, max = 70°C. The ocean water is at T , = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m2-K. The convection coefficient associated with the flowing crude oil is h¡ = 450 W/m2-K. = 0.03 W/m-K) (2) It is proposed to enhance the performance of the…Determine the convection heat transfer resistance on the inside of the pipe per unit length, in m-K/W. R' 1.conv.i = m-K/W iTo maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, inside diameter of Di 1 50 W/m-K) has an = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of = 250 mm and wall thickness to = t¡. Determine the maximum allowable crude oil temperature to ensure the Di, 2 polyurethane foam insulation (kp temperature of T, 0.0675 W/m-K) between the two pipes does not exceed its maximum service = 70°C. The ocean water is at T o, 0 = -5°C and provides an external convection heat transfer р, таx coefficient of ho = 500 W/m2.K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m2-K. (2) It is proposed to enhance the performance of…
- A thick-walled cylindrical tubing of hard rubber (k=0.151 W/m*K) having an inside radius of 5 mm and an outside radius of 20 mm is being used as a temporary cooling coil in a bath. Ice water is flowing rapidly inside, and the inside wall temperature is 275 K. The outside surface temperature is 300 K. A total of 20 W must be removed from the bath by the cooling coil. How many meter of tubing are needed?Heat Transfer with a Liquid Metal. The liquid metal bismuth at a flow rate of 2.00 kg/s enters a tube having an inside diameter of 35 mm at 425°C and is heated to 430°C in the tube. The tube wall is maintained at a temperature of 25°C above the liquid bulk temperature. Calculate the tube length required. The physical properties are as follows (H1): k = 15.6 W/m K, c,=149 J/kg K, u = 1.34 x 10-3 Pa s.A steam pipe carrying steam at 380 kPa pressure for a distance of 120 m in a chemical plant is not insulated. Estimate the Amount of heat saved if 16 cm steam line were covered with 85% magnesia pipe covering 5 cm thick. Take room temperature to be 36 ℃. Thermal conductivity of 85% magnesia is 0.0745 W/m−K , unit convective coefficient of room air, ho = 12 W m2−K .Take the steam temperature as 142℃. Use atleast 4 decimal places in every computation
- Quiz: A double-pane window consists of two 3 mm thick layers of glass separated by a 12 mm wide stagnant air space. For specified indoors and outdoors temperatures. 1. Determined rate of heat loss through the window and 2. The inner surface temperature of the window. kalass = 0.78 W/m-°C and k stagnant space = 0.026, The area of the window and the individual resistances are A=(1.2 m)x (2 m) = 2.4 m² Glass Glass Stagnant space Toi= 24 h = 10 w/m?.c To2- -5 c h2 25 w/m2.c 12 mm 3 mm mmQ1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of glass (k=0.78W/m.°C) separated by a (10mm) wide stagnant air space (k=0.026W/m.C). ). Take the (hi) on the inner surface = 10W/m2.°C and (ho) on the outer surface = 40W/ m².°C. Determine The steady rate of heat transfer through this double pane window is equal The temperature of its inner surface for a day during which the room is maintained at (293K) while the temperature of the outdoor is (263K) is equal to *A steam is flowing through a 5.7 m long of steel tube that has inner and outer radii of r, = 0.015 and r, 0,024 m, and a thermal conductivity of 0.14 W/m.K. The steam and the outer surface of the tube is maintained at constant temperature of 150 °C and the air = 25 °C, h = 0.35 W/m2.k) is surrounding the tube. To prevent the outer surface of the steel from the environmental conditions, a material that has a thermal conductivity of 0.014 W/m.k is wrapped over the outer surface of the steel. What is the maximum heat transfer from the steam to the air (W)? NOTE: Enter your answer. Answer Air Th Steam Steel Tr 111 To