Which mode or condensation is characterized by larger heat transfer rates?
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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?Analyze the condensation process using both chillers. Provide operating temperatures and pressures entering each component shown in the diagram (at points 1, 2, 3, 4). Indicate which chiller should be chosen based on the economics. See below for details: -Your work is replacing a chiller that is used as part of a distillation process that condenses methanol (boiling point = 65 °C). Your task is to select the most economical type of system. A conventional chiller will have a lower first cost and will have lower maintenance costs than one that involves enhanced heat transfer surfaces, but the chiller with enhanced surfaces will condense the same amount of alcohol with a lower energy consumption. Select the appropriate chiller by considering the net present value of both systems. That value will involve the first cost of the chiller, and the present value of the maintenance and energy costs. The chiller uses a standard vapor-compression refrigeration cycle with R-22 (see Figure 1). For…An aluminum-alloy rod has a length of 9.9269 cm at 30.00°C and a length of 9.9686 cm at the boiling point of water. (a) What is the length of the rod at the freezing point of water? (b) What is the temperature if the length of the rod is 9.9324 cm? (a) Number (b) Number i Units Units
- 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.1. Water at atmospheric pressure is to be boiled in polished copper pan. The diameter of the pan is 300 mm and is kept at 111°C. Calculate the following : () Power of the burner to maintain boiling; (i) Rate of evaporation in kg/h. Take the properties of water at 100°C as follows: P, = 958 kg/m"; p, = 0.597 kg/m²; µ,= 278 × 10ʻ kg/ms; c= 4216 JkgK; = 2257 kJ/kg ; Pr= 1.723, o = 58.9 x 10-³ N/m %3D [Ans. (1) 13.664 kW, (i) 21.8 kg/h]Discuss the assumptions made in the Nusselt’s theory of film condensation on a vertical plate.
- Question 3 Which statement about vaporization enthalpy and condensation enthalpy is correct? O The condensation enthalpy is equal in magnitude but opposite in sign when compared to the vaporization enthalpy O There is no general relationship between these two quantities and the values depend on the substance involved. O The vaporization enthalpy is always less than the condensation enthalpy. O The vaporization enthalpy is exactly equal to the condensation enthalpy.Discuss the technical points on pressure- temperature diagram for condensate gas reservoir and explainIn boiling water at 1 atm pressure outside a stainless-steel tube with a surface temperature of 410F, the heat-transfer coefficient h in the absence of radiation is 32 Btu/h*ft^2*F. If the emissivity of the stainless steel is 0.8, will radiation significantly augment the rate of boiling (e.g., by more than 5 percent)? Assume that the vapor film is transparent to radiation and the boiling liquid is opaque.