Water (5.2 L/min) is flowing in a tube "D= 3 cm, L=5 m" and is to be heated from 15°C to 59.9°C by applying a uniform heat flux on the outer surface of the tube by electric resistance heater. What is the power rating of the resistance heater (kW)? 0.8 If turbulent flow use Dituss-Boetler relation Nu=0.023 Re Pr 3. Properties : p =992.1 kg/m , C,- 4179 J/kg.°C k= 0.631 W/m°C, Pr= 4.32, v= 0.658E-6 %3D P m /s
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- Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5-cm-ID, 60-cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16C, and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/m K. The properties of the oil at various temperatures are listed in the following table: Temperature, T(C) 15 30 40 65 100 (kg/m3) 912 912 896 880 864 c(kJ/kgK) 1.80 1.84 1.925 2.0 2.135 k(W/mK) 0.133 0.133 0.131 0.129 0.128 (kg/ms) 0.089 0.0414 0.023 0.00786 0.0033 Pr 1204 573 338 122 55To cool a storehouse in the summer without using a conventional air-conditioning system, the owner decided to hire an engineer to design an alternative system that would make use of the water in the nearby lake. The engineer decided to flow air through a thin smooth 10-cm-diameter copper tube that is submerged in the nearby lake. The water in the lake is typically maintained at a constant temperature of 15°C and a convection heat transfer coefficient of 1000 W/m2?K. If air (1 atm) enters the copper tube at a mean temperature of 30°C with an average velocity of 2.5 m/s, determine the necessary copper tube length so that the outlet mean temperature of the air is 20°C.Water at an average temperature of 180°F and an average velocity of 4 ft/s flows through a thin-walled 3/4 -indiameter tube. The water is cooled by air that flows across the tube with a velocity of 12 ft/s at an average temperature of 80°F. Determine the overall heat transfer coefficient.
- a)Identifythe maximum velocitylimitof ammonia gas in the pipe if the flow is to be maintained as laminar flow. b)If the actual velocity of ammonia gas is 0.9 times the maximum velocitylimit, calculatethe heat transfer coefficient and heat transfer flux if the heat transfer area is 0.16m^2. c)Suppose the pipe has an outer diameter of 43.1 mm and the outer surface wall temperature of the pipe is 356 K, determinethe thermal resistance and thermal conductivity of the pipe.Which is correct in computing for the overall heat transfer coefficient, the one with Area involved in the formula or not?The blades of a wind turbine turn a large shaft at a relatively slow speed. The rotational speed is increased by a gearbox that has an efficiency of 0.93. In turn, the gearbox output shaft drives an electric generator with an efficiency of 0.95. The cylindrical nacelle, which houses the gearbox, generator, and associated equipment, is of length L = 6 m and diameter D = 3 m. If the turbine produces P = 2.5 MW of electrical power, and the air and surroundings temperatures are T = 25 oC and Tsur = 20 oC, respectively, determine the minimum possible operating temperature inside the nacelle. The emissivity of the nacelle is 0.83, and the convective heat transfer coefficient is h = 35 W/m2 .K. The surface of the nacelle that is adjacent to the blade hub can be considered to be adiabatic, and solar irradiation may be neglected. Use Fin or N number of fins to reduce the Ts of the nacelle less than 143 oC
- Determine the transfer coefficient for water flowing through a 1-inch pipe.inch, 16 BWG and 3 m / s, if the tube temperature is 82 ° C and the water enters at 21 ° C and exitsat 55 ° CWater is to be heated from 15°C to 65°C as it flows through a 3-cm-internaldiameter 5-m-long tube . The tube is equipped with an electric resistance heater that provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady operation all the heat generated in the heater is transferred to the water in the tube. If the system is to provide hot water at a rate of 10 L/min, determine the power rating of the resistance heater. Also, estimate the inner surface temperature of the tube at the exit.You are designing a piping system to facilitate the transfer of water from one industrialprocess to the next. You need the water to condense from saturated vapor to saturatedliquid at a constant 1000 kPa as it flows through the piping system. The pipe is to be madeof plain carbon steel with thermal conductivity ? = 60 W m-K⁄ and inner and outer radii?? = 5 cm and ?? = 7 cm, respectively. The thermodynamic property table at the end of thisproblem will be helpful throughout your analysis.a) If the convection coefficient between the steam and inner wall of the pipe is “verylarge”, what is the temperature of the inner pipe wall along its entire length?(Hint: Isobaric phase change is also iso___?)b) The fluid surrounding the pipe has temperature ?∞ = 30°C and the convectioncoefficient from the pipe to this fluid is ℎ = 100 W/m2⋅K. What is the heat transferrate out of the pipe, per unit meter of pipe? You may neglect radiation effects. Usea thermal resistance network in your analysis.c) The…
- In the effort to find the best way to cool a smooth thin-walled copper tube, an engineer decided to flow air either through the tube or across the outer tube surface. The tube has a diameter of 6 cm, and the surface temperature is maintained constant. Determine the convection heat transfer coefficient when air is flowing through a thin-walled tube at 25 m/s with bulk mean temperature of 50°C. _____ w/m^2kHeat 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 rateEngine oil at 60ºC (μ = 0.07399 kg/m s, ρ = 864 kg/m3) flows in a 8-cm-diameter tube with a velocity of 2.2 m/s. Determine (a) the friction factor and (b) pressure drop along a fully developed 6-m long section of the tube Water at a mean temperature of 25°C flows across a 1-cm square tube in cross-flow with a Reynolds number of 10,000. Calculate (a) Nu and (b) the convection heat transfer coefficient.