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)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 vertical condenser composed of ½” and 1.5” Std Steel pipes will handle cyclohexane vapor condensing at 1 atm inside the small pipe. Assume water as the cooling medium at an average temperature of 70oC and heat transfer coefficient of 3000 W/m2 -K. Assuming film type condensation, what is the mass rate of cyclohexane if the exchanger is 1.5 m long?I need help on this question: (This question requires the use of Roger & Mayhew Steam Property Tables) Saturated steam at 1 atm is condensed on the external surface of a copper tube withan outside diameter 16 mm and tube wall of thickness 0.5 mm. The tube is cooledinternally by water with a mass flow rate of 0.06 kg/s, which in turn is raised intemperature from 15 oC to 60 oC as it flows through the tube. (Take the heat-transfer coefficient at the condensing side as 10.0 kW/m2K and the isobaric specific heat-capacity of water as 4180 J/kg K.) a) To calculate the heat transfer rate to the cooling water b) To calculate the length of the tube c) Comment on how to enhance heat transfer in this case.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.
- The condenser of a steam power plant consists of AISI 302 Stainless steel tubes, each with outer and inner diameters of 35 mm and 30 mm, respectively. Saturated steam at 0.135 bar condenses on the outer surface of the tube, while water at a mean temperature of 295 K is in fully developed flow through the tube (you can assume that 295 K is the mean temperature in the axial direction of the tube (e.g. along its length) or you may assume that the inlet water temperature is 295 K). For a water mass flow rate of 0.22 kg/s, what is the outer surface temperature of the tube and the rates of heat transfer and steam condensation per unit tube length? As an approximation you may evaluate the properties of the liquid film at the saturation temperature.Estimate the power required to boil the water in a copper pan (Cs,f = 0.013 and n = 1), 180 mm in diameter. The bottom of the pan is maintained at 115 ℃ by the heating element of an electric range. Properties of Water (1 atm): Tsat = 100℃, ρl = 957.9 kg/m3, ρv = 0.5955 kg/m3, Cpl = 4217 J/kg.K, μl = 279*10^-6 N.s/m2, Prl = 1.76, hfg = 2257 kJ/kg, σ = 58.9*10^-3 N/m. Select one: a. 16420 W b. 18166 W c. 16240 W d. 11760 WSaturated, 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.
- 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_R22 Condenses. on_the outside of a horizantaf tubes ni a shellnd -tube condenser. The Rethigmnt is condensing at 482, and the tubes temp.is 40 Outide diámetir of tubes is 20mm and 14 tubes acanged n vertakal rows as 2,3,4,3,a0ed_2. Calentate the menn condencing heat - transfer Coefficient anea) Liquid water in a tank can be converted into ice just by evacuating the air from the tank without using heat exchanger. Explain the process and how the device works and the process can be made more efficient. (b) If you have two pots with the same volume but different shapes, one is tall and narrow the other is wide and short, compare and explain about the boiling temperature of the two cases.Discuss the reason why the required temperature for the two cases are different or same on the basis of your answer