00:01
This problem, we have a fairly complicated steam plant here, power plant.
00:09
Turban, boiler, condenser as normal.
00:12
A pump here that this is an open water, an open feed water heater.
00:22
So we have, we need to pump up the pressure from out of the condenser so that it is the same as the pressure coming down from 10.
00:33
So the pressure at 2 and at 10 are going to be the same and the pressure at 3 and 2 and then all, well, here we have another pump.
00:43
So then we are mixing here, we're mixing steam from the turbine, feed water, and then the steam from the turbine that has been cooled in a closed feed water heater here.
01:02
So this pump pumps it up to the boiler pressure and feeds it in here.
01:10
So we have kind of this complicated ts diagram where we have, let's see here, we have a feed coming off at 9 at 10 and then 11 is the exit.
01:23
Up at the entrance we have 10 megapascals.
01:26
The first feed here is coming off at 1 .2 megapascals, coming off here at 600 kilpascals.
01:34
So then we go through the pump here.
01:38
And here i think we have a saturated vapor at three, at one, and at seven.
01:47
No, i think that should be a six.
01:50
Not a seven.
01:51
That can't be right.
01:53
That's going to be a six.
01:56
So here.
01:59
And let's see here.
02:00
We know the temperature.
02:02
Do we know the temperature at the tarbent? yeah, we normally need that to make any progress.
02:10
So the temperature at 8 into the turbine is 600 degrees celsius out of the boiler and into the turbine.
02:21
Okay, so we've got a lot to analyze here.
02:26
Let's start with this pump.
02:29
We can give the enthopi as condensed a saturated liquid here, the specific volume, and then we can get the work done.
02:38
By this pump in pumping it up from 10 kilopascals to 600 so we get you know very little specific work into this pump let's see here then we have uh we can then find the antopoeia 2 because that's this plus this and now we can look at 3 because let's see here 3 we know we know the pressure at 3 and we know the what else do we know at three the pressure at three oh and it's a and it's a saturated liquid so we can get this information at three here the enthalpy the specific volume and that means we can figure out the work done and going from three to four by the pump and that's about 10 .5 10 .4 kilojoules per kilogram and then we can get the enthalpy at 4, which is anthropi at 3 plus the work done by the pump.
03:46
And now we can turn our attention to 6.
03:50
So 6, we have pressure and saturated liquid.
03:57
So we can get our enthalpy.
04:00
We can figure out what our temperature is there.
04:02
And we know that the temperature at 6, or at 5, temperature at 6, right here, there's also going to be the temperature at five.
04:15
Okay, yeah.
04:16
So we're assuming, again, that we have an ideal heat exchanger.
04:19
So what's coming out here is also the same temperature as what's coming in here.
04:24
So we got a good heat exchange in there.
04:27
So then we can get the enthalpy at five because we know the pressure and the temperature now at five.
04:37
This is not the enthalpy at six.
04:41
What is this? what is that? hmm, did i, six? we knew the anthropia at four.
05:00
And so at six we have a pressure and we have a temp.
05:04
We have a pressure and we have this.
05:07
So that we got.
05:08
So then what is this? what did i write wrong there? that's got to be, i can't be six.
05:22
That can't be a set.
05:23
That has to be, that's too high of a, is that eight? that might be eight.
05:31
Let me check my notes.
05:33
Because that's too high for a liquid.
05:36
Much, much too high for a liquid.
05:39
So let's see here.
05:41
I bet you this should be eight.
05:48
I'm almost positive that that should be eight.
05:51
Let's see here.
05:55
I'm 51.
05:57
Okay, let's see here.
06:00
An anthopy of 36.
06:02
Where did i get that? 6.
06:05
Oh, no.
06:07
I'm looking at the wrong problem again.
06:10
Uh, 53.
06:12
Yes.
06:12
Anthopy at 8.
06:15
Yes, indeed.
06:16
That had to be...