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Liquid water at 300 kPa and 20°C is heated in a chamber by
Chapter 5, Problem 71P(choose chapter or problem)
Problem 71P
Liquid water at 300 kPa and 20°C is heated in a chamber by mixing it with superheated steam at 300 kPa and 300°C. Cold water enters the chamber at a rate of 1.8 kg/s. If the mixture leaves the mixing chamber at 60°C, determine the mass flow rate of the superheated steam required.
Questions & Answers
QUESTION:
Problem 71P
Liquid water at 300 kPa and 20°C is heated in a chamber by mixing it with superheated steam at 300 kPa and 300°C. Cold water enters the chamber at a rate of 1.8 kg/s. If the mixture leaves the mixing chamber at 60°C, determine the mass flow rate of the superheated steam required.
ANSWER:
Step by step solution Step 1 of 4Write the energy balance for the steady flow system as follows:Here,mass flow rate of liquid water at state 1,2and 3 is ,respectivelyAssume mixing chamber as the steady-flow system that is a control volume as mass traversesthe boundary.Write the energy balance for system in the rate form as follows:Here,net energy transfer by heat,work and mass at inlet and outlet isrespectively,and rate of change in internal,kinetic,potential,of system is