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Please check your equations. Is the denominator 1-n or n-1?

@@WannabeProfessor86ohhh thanks prof I just noticed it’s n-1 why yours is 1-n

@@Cryptorie It is a matter of algebra really. While deriving the equation through integration, you end of up with 1 - n in the denominator. But as we know from algebra we can switch the sign on the denominator IF we switch the sign on the numerator as well. That's how your equation looks different.

Great questions. The wording of the problem indicates that steam is used to refer to the saturated mixture here. In part b, we are tasked to find the quality of steam. Quality is meaningless for steam as the entire mass of water is in gas (vapor) form and so quality would be 1. So long story short, steam here refers to the entire system of liquid and vapor water in phase equilibrium.

Thank you :)

Great question. If you really think about it, vapor and gas are the same. When we use vapor, we try to emphasize that this gas form is coming from a liquid phase. We want to keep in mind that phase change between liquid and gas form either happened or is a possibility. I hope this helps.

I will try. I am very bad at this TH-cam thing haha.

@@WannabeProfessor86I don't think so, I recommended your channel to many friends of mine:)

@@mustafakoseoglu7608 Thank you :)

Thank you.

Thank you :)

Good catch! Yes, I forgot to include temperature.

Great question. Unless stated otherwise, mixing chambers, heat exchangers, turbines, pumps, compressors, evaporators, condensers, and throttling valves are all steady flow!

I think I need to re-do the fluid videos when I get the chance. I was not happy with the outcome and stopped working on fluids all together.

No, not really. To better understand it, please review the 1st law analysis of control volumes. There you can better see that the work of an adiabatic compressor, turbine, or pump is the equal to the change of enthalpy, rather than internal energy. Now for ideal gases, change of enthalpy is equal to cp*deltaT. Hope this clarifies things for you. Let me know if you still have questions.

@@WannabeProfessor86 Oh yes, I remembered, thank you so much!

Good point. Please take note that the volumetric flow rate is 0.3 m^3 per minute, not per seconds. I skipped the conversion from minutes to seconds. The number in the video is correct kg/s!

@@WannabeProfessor86 Yes, I just divided the numbers appearing on the screen. When we divide 1.850 by 60 in order to convert it into per seconds, of course it gives 0.0308. Thanks!

Yes, you are right. That is a miscalculation on my end. Good catch!

That's a great question. Often, when looking for compressed liquid properties, we see that the compressed liquid tables are missing our data. Usually, this happens when the pressures are relatively low. When this is the case, like our question #2, we can approximate the compressed liquid properties with that of a saturated liquid at the same temperature. I hope this clarifies things for you.

@@WannabeProfessor86 Thanks for the answer!

Sorry for my very late reply. Are you reading your numbers at P = 200 kPa or T = 200? I am only asking because that is a very common mistake to make. I re-did my calculations and the number in the video looks correct.

@@WannabeProfessor86 I also re-did them and found it to be 0.53 this time. If I remember how I got the number 0.77, I will comment here. And I am the one who is sorry for asking a nonsense question and wasting your time. Thank you so much for your effort! After 5 minutes edit: I just remembered that I interpolated between the numbers 0.601061 and 0.88573 m^3/kg on the board at 1:39:05 and found 0.77. But when I checked the data from the tables, I noticed that Vf is equal to 0.001061 instead of 0.601061, which gives the correct result 0.53. Should that have been 0.001061 or am I still missing something? The last edit: I confused the first decimal digit "0" of Vf with a "6". Problem solved, thanks again! :)

Thanks. Glad you like it.

Thank you :)

Thanks. I am glad you found it helpful.

I am very slow with this TH-cam thing but I try my best.

It is in the pipeline haha.

@@WannabeProfessor86 prof please I want thank you for videos really helping me in thermodynamics exams😂 . We are taking a course in fluid mechanics can I please get a complete series of videos as you did in the thermodynamics so I do not waste time to understand the handout given to us by our lecturer. I mean to say your videos made me finish the the topics on time without opening our handout

And also the sad thing is that we will start the fluid course mid way through may and I am really counting on your well arranged videos for survival. Thanks to one of my best teachers. My mates now call me professor wannabe 😅

Thank you for your support. Hopefully, I can upload something soon-ish haha.

@@WannabeProfessor86 Please do

Thank you. I hope this helps with your exam.

hey i saw your name is Ardeshir are you iranian by any chance? if so, Merci basa dasiyka yad midi

@@danielmajidi1048 :)

@@danielmajidi1048 daniel does this guy have lectures on rankine cycles, cos i can't find any.

Thank you! I hope it helps.

Thanks for the comment. Yes, that is exactly the process of finding those values. Essentially you need to do linear interpolation for every entry in the table that you need. You can use an excel spreadsheet to your advantage. However you do it, it is a little time consuming.

Thank you. I am really happy that my videos helped you.

Glad you like them.

Thank you. Hopefully I can upload something soon.

That's a great question. The entropy generation of every irreversible process is always positive. As a matter of fact every real process has a positive change of entropy (change entropy is different than entropy generation) unless the process has negative heat transfer. Taking heat out of a system is the only way to reduce the entropy of that system. Hope this helps.

Thanks for your support. Do you mean exergy analysis?

Thanks for your support.

You can calculate the quality of a mixture using any of the common properties such as entropy, enthalpy, internal energy, and/or specific volume. The equation is very simple as shown in the video. quality = (property of the mix - property at the saturated liquid state) / (property at the saturated vapor state - property at the saturated liquid state) hope this helps.

@@WannabeProfessor86 thankss a lot