00:01
And this problem, let's see, we have another simple ranking cycle with steam.
00:06
This time we have a saturated or a two -phase fluid coming out of the turbine.
00:15
Again, the low pressure is down here at 50 kilopascals.
00:19
High pressure is at 6 megapascal.
00:22
Again, we're told that the rate of heat transfer into the system is 40 megapal.
00:31
So we can get the entropy in the specific volume at one, get the energy that it takes the pump to pump that up to from 50 to 6 ,000 kilobascals.
00:48
And then energy balance in the pump gives us the enthalpy exiting the pump.
00:53
So then we know we're given the temperature here, which is 6 ,600 degrees c, and we know the pressure, so we can get the entropy and the entropy.
01:02
It's an isotropic turbine, so we can know that s4 is the same as s3, and we know p4, so we can get the quality factor, and we can get h4.
01:14
Now, we have now the enthalpy at all of our inlets and outlet, so we can get the specific heat going in, which is just h3 minus h2.
01:28
And the specific heat going out, which is h, let's see here, h4 minus h1.
01:36
And from this, we can get the efficiency, which is just one minus the ratio of q out over qn...