ws inside a 1-in s =180 W/m2℃ overall boat t
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Air at 2 atm and 200◦C flows inside a 1-in schedule 80 steel pipe with h=65 W/m2 · ◦C. A hot gas with h=180 W/m2 · ◦C flows across the outside ofthe pipe at 400◦C. Calculate the overall heat-transfer coefficient.
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- 7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?Air flows at 120 oC in a thin-walled tube (k = 18 W/m oC) with h = 65 w/m2- oC. The inside diameter of the tube is 2.5 cm tand the wall thickness is 0.4 mm. The tube is exposed to an environment with h = 6.5 W/m2-oC and temperature of 15 oC. Calculate the Overall heat transfer coefficient and the heat loss for 1 m length. (four decimal places for final answer)A liquid metal flows at a mass rate of 3 kg/s through a constant heat flux 5-cm-i.d tube in a nuclear reactor. The fluid at 473 K is to be heated with the tube wall 30 K above the fluid temperature. Determine the length of the tube required for a 1-K rise in bulk fluid temperature, using the following properties: p = 7.7 x 10^3 kg/m^3v = 8.0 x 10^-8 m^2/sCp = 130 J/(kg K)k = 12 W/mKPr = 0.011 Kaufman's correlation: Nu = 0,625.(Re.Pr)0,4
- Dry and saturated steam at 6 MPa abs. enters a 40 m length of 11.5 cm O.D steel pipe at a flow rate of 0.12 kg/s. The pipe is covered with 5 cm thick asbestos insulation (k= 0.022 W/m-K). The pipe is located in a tunnel with stagnant air temperature of 27°C. The unit outside convective coefficient is 10 W/m^2-K. Neglecting steam film and pipe wall resistance, determine the mass of steam.Calculate the heat losses per unit length in a horizontal tube with an outside diameter of 15 cm, if its surface is kept at 400 K AND the surrounding air has a temperature of 300 K and a pressure of 1 bar.The properties of air at a pressure of 1 bar and a film temperature of 350 K are: In this case, v = 20.76 x 10-6 m2/s , α = 0.2983 x 10-4 m2/s, k = 0.03003 W/mK, Pr = 0.697, β = 2.86 x 10-3 K-1A 10 ft length of pipe with an inner radius of 1 in and outer radius of 1.25 in has an outer surface temperature of 250 F. The heat transfer rate is 30,000 BTU/hr. Find the interior surface temperature. Assume k = 25 BTU/hr-ft-F.
- Heat transfers Air is to be heated from 15 C to 270 C, as it flows through a tube 25mm diameter at average velocity 30 m/s. The tube surface is maintained at 280 C and the air is to be provided at rate 0.013 kg/s. Take the water properties k=0.0336 W/m.C , υ = 25.9× 10-6 m2/s , Cp=1.014 kJ/kg.C , ρ = 0.8826 kg/ m3 , Pr=0.689 . Determine the following The necessary tube length Heat transfer coefficient Heat transfer rateA constant heat flux q = 200 W / m2 is applied to a circular section pipe with a diameter D = 50 mm and a length L = 8 m, and water flows at a flow of 0.01 kg / s under the pipe. The entrance temperature of the water to the pipe is 29 oC. Which of the following is the average fluid temperature at the outlet of the pipe (x = L) with the fluid transmission at 30 oC? a. 39.21 oC b. 84,23 oC c. 66,59 oC D. 61.43 oC e. 83,28 oCFurnace walls are lined by 3 layers: firebrick with a thickness of 6 in (k=0.95 Btu/h.ft. F), insulating brick (k-0.4 Btu/h.ft.°F) and common brick (k=0.8 Btu /h.ft.°F) Firebrick inlet temperature, T₁ = 1800°F, maximum insulating brick temperature, T₂ = 1720°F and T3 = 280°F. 1. Calculate the thickness of the insulating brick layer. 2. If the common brick is 9 in, calculate the exit temperature.
- Dry and saturated steam at 6 MPa abs. enters a 40m length of 11.5 cm O.D steel pipe at a flow rate of 0.12 kg/s. The pipe is covered with 5cm thick asbestos insulation (k= 0.022 W/m-K). The pipe is located in a tunnel with stagnant air temperature of 27°C. The unit outside convective coefficient is 10 W/m^2-K. Neglecting steam film and pipe wall resistance, determine the mass of steam.n electric generator at a power plant produces energy by passing superheated steam from a high temperature container (reservoir), through a pipe connected to a series of fans, and then into a low temperature reservoir. As the steam passes across the blades of the fans some of the heat energy of the steam is transformed into mechanical energy, which turns the fans which in turn are connected to a generator, which in turn converts the mechanical energy into electrical energy. If the high temperature steam has a temperature of 412.1 K and the low temperature reservoir has a temperature of 105.4 K, what is the Carnot efficiency of this process?Liquid bismuth flows at a rate of 4.5 kg/s through a 5.0-cm-diameter stainless-steel tube. The bismuth enters at 415◦C and is heated to 440◦C as it passes through the tube. If a constant heat flux is maintained along the tube and the tube wall is at a temperature 20◦C higher than the bismuth bulk temperature, calculate the length of tube required to effect the heat transfe