diameter 2 cm and length ter re of 150 °C.
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b) the average condensation heat-transfer coefficient over the entire length of the tube.
c) the total condensation rate at the tube surface.
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- Saturated, 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.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.Question 3 This question requires the use of the steam property tables (Rogers and Mayhew) uploaded on QM+ exam section. All properties should be evaluated at the temperature of the steam. Saturated, pure steam at a temperature of 170 °C 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 °C. Calculate: the local film condensation heat-transfer coefficient at the bottom of the tube. a)
- 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 horizontal pipe of 125-mm-diamter and 1 m long with a surface temperature of 95 ℃ is used to condense saturated steam at 1 atm. Determine the heat transfer rate for the condensation process. Properties of Water, vapor (1 atm): Tsat = 100℃, ρv = 0.596 kg/m3, hfg = 2257 kJ/kg; Water, liquid (Tf = 370K): ρl = 960.6 kg/m3, Cpl = 4214 J/kg.K, μl = 289*10^-6 N.s/m2, kl = 0.679 W/m.K.A horizontal pipe of 100-mm-diamter and 1 m long with a surface temperature of 94 ℃ is used to condense saturated steam at 1 atm. Determine the heat transfer rate for the condensation process. Properties of Water, vapor (1 atm): Tsat = 100℃, ρv = 0.596 kg/m3, hfg = 2257 kJ/kg;Water, liquid (Tf = 370K): ρl = 960.6 kg/m3, Cpl = 4214 J/kg.K, μl = 289*10^-6 N.s/m2, kl = 0.679 W/m.K. Select one: a. 28567 W b. 18254 W c. 19076 W d. 22552 W
- Only answer if you are 100% sure otherwise i will downvote... An ASTM B75 copper tube sheathes a heating element that is used to boil water at 1254 kPa. The copper tube is immersed horizontally in the water, and its surface is polished. The tube diameter and length are 5 mm and 9.5 cm, respectively. The maximum use temperature for ASTM B75 copper tube is 204°C. Determine the highest evaporation rate of water that can be achieved by the heater without heating the tube surface above the maximum use temperature. Use the property tables to calculate the properties of water at saturation temperature. The surface tension 0 at 190°C is 0.03995 N/m. Also, Csf 0.0130 and 10 for the boiling water on a polished copper surface. The highest evaporation rate of water is g/s?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]Water is to be boiled at atmospheric pressure in a polished copper pan by means of an electric heater. The diameter of the pan is 0.48 m and is kept at 108 deg C. What is the power required to boil the water? Tsat = 100°C; Properties of water at 100°C: Density, pl= 961 kg/m3; Kinematic viscosity., v 0.293x10-6 m2/s; Prandti Number, Pr = 1.740; Specific heat, Cpl = 4216 J/kg.K: Dynamic viscosity, p = p x v = 961 x 0.293 x 10-6 = 281.57 x10-6 Ns/m2; hfg = 2256.9 k/kg: pv = 0.597 kg/m3; 0 = 0.0588 N/m: Csf=0.013; n=1: Select one: O a. 11633.5098 O b. 13259.1393 O c. 16641.2421 O d. 9493.7946
- Saturated, pure steam at a temperature of 170 °C 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 °C. 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.Question 3 This question requires the use of the steam property tables (Rogers and Mayhew) uploaded on QM+ exam section. All properties should be evaluated at the temperature of the steam. Saturated, pure steam at a temperature of 170 °C 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 °C. 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.The condensation process of vapors on the outside of horizontal tube banks is described by the equation below, NNU = 0.725 (gp² hfg Do³) μ Δt Ν k where N tubes/row At = hfg Density, p Dynamic viscosity, μ Latent heat, hfg Thermal conductivity, k AT = difference between wall surface & R-22 NNu 3 1,109 kg/m 0.00018 Pa s = Refrigerant - 22 condenser operating at 45 C cooled with water from cooling tower entering at 30 C and leaves at 36 C. The condenser is shell-tube type with copper tubes of 14 mm ID & 16 mm OD arranged with 3 tubes per row (N). a) Considering the results of sample problem #2 (fw = 6,909.4 W/m²K film coefficient at water side), compute the overall heat transfer coefficient based on outer surface area in W/m² K of a water-cooled shell-tube R-22 condenser. At 45 C R-22 properties are: 160.9 kJ/ kg 0.0779 W/m K (*50-45) = 5 C (*from sample problem #2 pipe wall temperature) diff. of temp between wall & fluid latent heat of condensation generally a function of (NR₂. Nor) D/ k