Question

Your Name is: Section (circle 1) PM AM IEC Thermodynamics Sections 4 and 5 Exam 3 Fall 2014 Please read the entire exam before beginning work, then read each question carefully before answering it. I am most interested in the approach you take, so please show your work, and note that the right answer for the wrong reasons is wrong. One point will be deducted for every dimensional number that is written without units. 1. (25 pt) 0.3 kg/min of superheated steam at 115°C and 1 atm is mixed with 0.7 kg/min of liquid water at 50°C and 1 atm. What is the temperature of the mixture? What phase is the mixture? If it is a two phase mixture, what fraction (mass basis) is in the vapor phase? The heat capacity of liquid water is 4.2 kJ/kg K, the heat capacity of steam is 1.8 kJ/kg K, and the heat of vaporization of water at 100°C is 2257 kJ/kg. Diagram:

          Your Name is:
Section (circle 1)
PM
AM
IEC Thermodynamics Sections 4 and 5
Exam 3
Fall 2014
Please read the entire exam before beginning work, then read each question carefully before
answering it. I am most interested in the approach you take, so please show your work, and
note that the right answer for the wrong reasons is wrong. One point will be deducted for
every dimensional number that is written without units.
1. (25 pt) 0.3 kg/min of superheated steam at 115°C and 1 atm is mixed with 0.7
kg/min of liquid water at 50°C and 1 atm. What is the temperature of the mixture?
What phase is the mixture? If it is a two phase mixture, what fraction (mass basis) is
in the vapor phase?
The heat capacity of liquid water is 4.2 kJ/kg K, the heat capacity of steam is 1.8
kJ/kg K, and the heat of vaporization of water at 100°C is 2257 kJ/kg.
Diagram:

$Your Name is: Section (circle 1) PM AM IEC Thermodynamics Sections 4 and 5 Exam 3 Fall 2014 Please read the entire exam before beginning work, then read each question carefully before answering it. I am most interested in the approach you take, so please show your work, and note that the right answer for the wrong reasons is wrong. One point will be deducted for every dimensional number that is written without units. 1. (25 pt) 0.3 kg/min of superheated steam at 115°C and 1 atm is mixed with 0.7 kg/min of liquid water at 50°C and 1 atm. What is the temperature of the mixture? What phase is the mixture? If it is a two phase mixture, what fraction (mass basis) is in the vapor phase? The heat capacity of liquid water is 4.2 kJ/kg K, the heat capacity of steam is 1.8 kJ/kg K, and the heat of vaporization of water at 100°C is 2257 kJ/kg. Diagram:$

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