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A fixed mass of saturated water vapor at 400 kPa is
Chapter 4, Problem 32P(choose chapter or problem)
Problem 32P
A fixed mass of saturated water vapor at 400 kPa is isothermally cooled until it is a saturated liquid. Calculate the amount of heat rejected during this process, in kJ/kg.
Questions & Answers
QUESTION:
Problem 32P
A fixed mass of saturated water vapor at 400 kPa is isothermally cooled until it is a saturated liquid. Calculate the amount of heat rejected during this process, in kJ/kg.
ANSWER:
Step by step solution Step 1 of 3To find the heat rejected per unit of mass, we will use the energy balance equation.There is no potential or kinetic energy change so the equation is: is the heat rejected per unit mass is the specific work done by the system is the change in internal energyThe whole process is isothermal and in the process the water goes from the saturated watervapor phase to the saturated liquid phase.Since phase and the temperature stays thesame,the pressure will also stays the same .The needed is then actually the specific internal energy of evaporation at the givenpressure.