show an example of the use of steam tables and Mollier charts. Use the following information to show...

Question

show an example of the use of steam tables and Mollier charts. Use the following information to show how the answer can be calculated using either of the 2 methods.
A) Find the enthalpy of steam at 0.4 MPa and 0.7 dryness

B) Determine the amount of heat required to convert 4Kg of water at t=38 degrees C into dry saturated steam at 1 MPa gauge pressure

Robert · Accepted Answer

Q1- Answer 
As we know that enthalpy of steam is given as mentioned below 
h = h f + x h fg 
 
Where, 
h f = Enthalpy of water 
x= dryness fraction = 0.7  
h fg = h g - h f 
h g = enthalpy of dry saturated steam 
at 0.4 M Pa or 4 bar , we have following information from steam table  
h f = 604.8 KJ/Kg 
h g = 2739 KJ/Kg 
h fg = 2739 – 604.8  
h fg =2134.2 KJ/Kg 
h = 604.8 + 0.7 x 2134.

show an example of the use of steam tables and Mollier charts. Use the following information to show how the answer can be calculated using either of the 2 methods. A) Find the enthalpy of steam at...

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