Question

turbine as saturated vapor at 0.51 be liquid watr The steam is con id by passing it over the tu densed to saturated liquid by passing it e steame a shell-and-tube heat exchanger, while lia tubes of 11.76 In a Rankine power system, 1.5 kg/s of having an inlet temperature of T280k uid Wale h the tubes. The condenser contains 100 t%ae and the total 5 kg/s. The aver- is passed throug water flow rate through the tubes is 15 kg/se age convection coefficient associated with condens on the outer surface of the tubes may be approximated as h, 5000 W/m2.K. Appropriate property values for the liquid water are cp 4178 J/kg K, H 700 x 10"6 kg/s·m, k = 0.628 W/m. K, and Pr-4.6. walled tubes, each of 10-mm diamet Condenser Turbine Water C,0 Steam from boiler Saturated liquid to pump (a) What is the water outlet temperature? (b) What is the required tube length (per tube)? (c) After extended use, deposits accumulating on the inner and outer tube surfaces provide a cumulative fouling factor of 0.0003 m2.K/W. For the prescribed inlet conditions and the computed tube length, what mass fraction of the vapor is condensed? (d) For the tube length computed in part (b) and the fouling factor prescribed in part (c), explore the extent to which the water flow rate and inlet tem- perature may be varied (within physically plausible ranges) to improve the condenser performance Represent your results graphically, and draw appro priate conclusions.

Answer 1

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