Question

Reconsider the top-secret military power supply for artic environments that you worked in a previous homework. Previously, you modeled it as a Carnot cycle; now you will use the more realistic Rankine cycle. The boiler operates at 1000 kPa with a maximum temperature of 30°C. The condenser is isobaric and operates at -5°C. a. Calculate the vapor quality leaving the turbine and the specific enthalpy exiting the turbine (in kJ/kg) b. Determine the specific-work produced by the Rankine cycle turbine (in kJ/kg), assuming it is ideal (reversible) and adiabatic. c. Show the cycle on a T-S? (temperature vs. specific entropy) diagram relative to the 2-phase region and label the isobaric pathway of the boiler with its pressure (in kPa). d. Determine the specific-work required by the Rankine cycle pump (in kJ/kg), assuming it is ideal (reversible) and adiabatic. e. Determine the specific-QH for the Rankine cycle (in kJ/kg). f. Calculation the Rankine cycle (thermal) efficiency g. Compare the required material strength (using maximum cycle pressure) and cycle efficiency of this Rankine cycle with a Carnot cycle operating with the same TH (30°C) and TL (-5°C) by calculating the percent change in max pressure and thermal efficiencies.

Answer 1