Homework Statement
In a constant pressure process ant 1 bar determine how much heat must be added to raise the temperature of 2kg of compressed water at a temp of 50C so that it become superheated steam at a temp of 200C?
u2=2659KJ/Kg
Homework Equations
W=-P(V2-V1) Q+W=U2-U1
The...
I got the values of U right I was just being an idiot and forgot the values were specific values and forgot factor in that I had 2kg of mass not 1. So I have got the right answer finally!
Thankyou Lawrence C you have been extremely helpful!
yeah Vf is tiny now I have found it got work done to -277.9KJ.
for U1 I got 1670.4KJ from using the formula u=uf+x(ug-uf) and for u2 i thought because i know the specific volume look it up in the steam tables it comes to 2734KJ but I don't get the right answer for heat supplied.
Because...
thanks yeah that was just a typo supposed to be (Vg-Vf).
The thing is I don't know values Vg and Vf are I have looked up in my steam tables and it says Vg is 1.694 at 1 bar but what is Vf?
Homework Statement
http://img140.imageshack.us/img140/2963/isobaricsteam.jpg
P1 and P2 are 1 bar. V2 4.812 and V2 specific volume is 2.406
X1=0.6
Homework Equations
v=vf+x(vf-vg)
W=-P(v2-v1)
Q=(u2+pv2)-(u1+pv1)
The Attempt at a Solution
Hi guys first timer here...