belief.) 1. Propane gas enters a continuous adiabatic heat exchanger¹7 at 40°C and 250 kPa and exits at 240°C. Superheat

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Belief 1 Propane Gas Enters A Continuous Adiabatic Heat Exchanger 7 At 40 C And 250 Kpa And Exits At 240 C Superheat 1 (219.89 KiB) Viewed 36 times

belief.) 1. Propane gas enters a continuous adiabatic heat exchanger¹7 at 40°C and 250 kPa and exits at 240°C. Superheated steam at 300°C and 5.0 bar enters the exchanger flowing countercurrently to the propane and exits as a saturated liquid at the same pressure. (a) Taking as a basis 100 mol of propane fed to the exchanger, draw and label a process flowchart. Include in your labeling the volume of propane fed (m³), the mass of steam fed (kg), and the volume of steam fed (m³). (b) Calculate values of the labeled specific enthalpies in the following inlet-outlet enthalpy table for this process. References: H₂O(1, 0.01°C), C3H8(g, 40°C) Species Ĥ in C3H8 H₂O nin 100 mol mw (kg) Ĥ₁ (kJ/mol) Ĥb(kJ/kg) nout 100 mol mw(kg) Ĥ (kJ/mol) Ĥa(kJ/kg) (c) Use an energy balance to calculate the required mass feed rate of the steam. Then calculate the volumetric feed ratio of the two streams (m³ steam fed/m³ propane fed). Assume ideal-gas behavior for the propane but not the steam and recall that the exchanger is adiabatic. (d) Calculate the heat transferred from the water to the propane (kJ/m³ propane fed). (Hint: Do an energy balance on either the water or the propane rather than on the entire heat exchanger.) (e) Over a period of time, scale builds up on the heat-transfer surface, resulting in a lower rate of heat transfer between the propane and the steam. What changes in the outlet streams would you expect to see as a result of the decreased heat transfer? Saturated steam at 300°C is used to heat a countercurrently flowing stream of mothonal