Figuring Out Heat Transfer & Entropy of Steam at 10 MPa

AI Thread Summary
To determine the entropy change and heat transfer for water transitioning from liquid to steam at 10 MPa, steam tables are essential for obtaining the specific entropy values (sfg) and heat transfer per unit mass. The problem allows for assumptions regarding the initial temperature, which can simplify calculations. The focus should be on the vaporization process, utilizing the properties listed in the steam tables. This approach will yield the necessary values for entropy and heat transfer. Accurate application of steam tables is crucial for solving this thermodynamic problem effectively.
Nick Goodson
Messages
7
Reaction score
2
Thread moved from the technical forums to the schoolwork forums
Hello everybody, would somebody please put me on the right track to answering this question?

'Consider water undergoes a heat transfer
at constant pressure of 10 MPa and
changes from liquid to steam. Find the
entropy of the system (sfg) as well as the
heat transfer per unit mass in this
process?'

Is this just looking at steam tables and working per unit mass?

I'd appreciate any help
Thanks
 
Physics news on Phys.org
The problem does not specify initial temperature.
If you are free to assume, you could use steam tables per unit mass for the vaporization process only.
 
  • Like
Likes Nick Goodson
Lnewqban said:
The problem does not specify initial temperature.
If you are free to assume, you could use steam tables per unit mass for the vaporization process only.
Thanks Lnewqban
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Thread 'Trying to understand the logic behind adding vectors with an angle between them'
My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
Back
Top