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Lecture 6

# ENGPHYS 2NE3 Lecture 6: Enthalpy, Quality, and Water PropertiesPremium

2 pages94 viewsFall 2017

Department
Engineering Physics
Course Code
ENGPHYS 2NE3
Professor
David Novog
Lecture
6

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1
2NE3 Lec 6
David Novog
Enthalpy
A combination property
o Extensive: H = U + PV ( KJ)
o Intensive: h = u + Pv (KJ/Kg)
For a given pressure, the latent heat of vaporization is the enthalpy difference:
o    
o This is the amount of energy required to vaporize one kg of substance
Mass Quality
Ratio of mass vapor to total mass of mixture


o Will = 0 if the substance is a saturated liquid
o Will = 1 if the substance is a saturated vapor
Saturated Mixture
Includes the mass of the liquid and the vapor
  
 
  
 
   

 
    
X is equal to the quality of a mixture
Any intensive property can replace v, so that we have a formula we can use to find properties of
a mixture
Example:
A 6L pressure vessel with 1.15 kg of water at 150 degrees Celsius. Find the pressure, the quality, the
enthalpy of the water, and the volume by liquid phase
  
   

      
  

We know that this is a mixture: in between the specific volumes of saturated water and saturate vapor
at this temperature.
    
  
     
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