Will the largest condensation heat transfer coefficient always be obtained for a horizontal finned tube with the maximum possible fpm?
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Will the largest condensation heat transfer coefficient always be obtained for a horizontal finned tube with the maximum possible fpm? |
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- What is condensation and when does occurs? How does filmwise condensation differs from drop-wise condensation? Which type has a higher heat transfer film coefficient and point out the reason thereof?a film-type condenser consists of a packed bed of 3-cm diameter spheres with a voidage of 35%. water sprayed onto the bed at 60oC is used to condense steam entering at the base at a saturation temperature of 100oC. How deep must the bed be to ensure complete condensation of the steam, and what is the outlet temperature of the water? (Use water properties based on the mean of the inlet and outlet water temperatures, and iterate if necessary)a) the local film condensation heat-transfer coefficient at the bottom of the tube b) the average condensation heat-transfer coefficient over the entire length of the tube c) the total condensation rate at the tube surface.
- 6. A vertica platc 450 mm high and maintained at 3°C is exposed o satuated seam atatmospheric pressare. Calculte: (1) The rate of hea ransfe, and () The condensate a per hour per mete for plae widih film condensation. “The propertiesof waer im at the mean temperaure are: 0.3 kg/m sk = 6.4 x 10 WinC; = 434 x 10° kg/ms; and b = 22569 kg [Ans. 4399 x 10° kI, 2188 ke/h]A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point of the product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect, 2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of an example solution spreadsheet .....A shell-and-tube condenser with horizontal 7/8-in BWG 16 copper tubes is used to condense benzene vapor. The vapor is condensed at atmospheric pressure, it’s enthalpy of vaporization is around 394 KJ/kg, and the thermal conductivity at the reference temperature is around 0.150 W/m.°C. Assume the cooling water average temperature to be 40°C and neglect the tube and water film resistances. a)Calculate the reference temperature Tf and evaluate the liquid properties at this temperature. You may use the textbook and/or Perry’s Chemical Engineers’ Handbook. b)Estimate the film coefficient for the top row of tubes (W/m2.°C). c)Estimate the average coefficient for a stack of 10 tubes (W/m2.°C).
- Which of the following is not an assumption that Nusselt made in analytically deriving the average heat transfer coefficient over a vertical surface surrounded by vapor undergoing film condensation? A. Film thickness is zero at the top of surface B. Falling film is undergoing laminar flow C. Heat transfer from the condensing vapor to the surface is happening via natural convection D. All the assumptions above are important to the film condensation problemSaturated, pure steam at a temperature of 170 oC condenses on the outer surface of avertical tube of outer diameter 2 cm and length 1.5 m. The tube surface is maintained at auniform temperature of 150 oC.Calculate:a) the local film condensation heat-transfer coefficient at the bottom of the tube. b) the average condensation heat-transfer coefficient over the entire length of the tube. c) the total condensation rate at the tube surface.A four-effect evaporator is being considered for concentrating fruit juice that has no appreciable boiling-point elevation. Steam is available at 143.27 kPa and the boiling point of the product in the fourth effect is 45°C. The overall heat transfer coefficients are 3000W/m2°C in the first effect, 2500W/m2°C in the second effect, 2100W/m2°C in the third effect, and 1800W/m2°C in the fourth effect. Calculate the boiling-point temperature of the product in the first, second and third effects. Assume the heating areas in all the effect are equal to 50m2 each. The mass flow rate of steam to the first effect is 2400 kg/h. The feed rate to the first effect of 5% total solids fluid is 15,000kg/h, the concentrated product from the first effect leave at 6.25% total solids, and the concentration of product leaving of the second effect is 8.82% total solids.
- A 0.013 m- o.d., 1.5-m-long tube is to be used to be condense steam at 40,000 N/m^2, Tsat=349K. Assume that the average tube-wall temperature is 325 K.The average convection coefficient for this tube in the horizontal position. is?A horizontal shell-and-tube condenser is to be used to condense saturated ammonia vapor at l 45 lbf/in2 .abs (Th = 82°F), The condenser has 19 steel tubes (1.5-in. OD, 1.3-in. ID) 14 ft long through which cooling water is flowing. The tubes are arranged hexagonally on 2-in. centers. The latent heat of ammonia at these conditions may be taken as 500 Btu/lb. The cooling water enters at 70°F. Determine the capacity of the condenser for these conditions.Saturated, pure steam at a temperature of 170 oC condenses on the outer surface of a vertical tube of outer diameter 2 cm and length 1.5 m. The tube surface is maintained at a uniform temperature of 150 oC. Calculate: the local film condensation heat-transfer coefficient at the bottom of the tube. the average condensation heat-transfer coefficient over the entire length of the tube. the total condensation rate at the tube surface.