We use engineering thermodynamics textbook like: Moran M.J., Shapiro H.N., Boettner, D.D., and Bailey B.B., Fundamentals of Engineering Thermodynamics, John Wiley and Sons,. OR another good textbook is Yunus Cengel and Michael Boles, Thermodynamics: An engineering approach, McGraw hill. Any edition of these books in past 10 years is good.
+Kevin Aton Either used property tables in back of textbook: M.J. Moran and H.N. Shapiro, Fundamentals of Engineering Thermodynamics, 8th Edition, Wiley and Sons, 2014. OR from Excel Add-in from Univ of Alabama, www.me.ua.edu/ExcelinME/thermo.htm Both give very similar values (but not exactly the same).
some may be from software, but values of properties are close in numerical values to tables in the textbook. I just don't remember. I like REFPROP software as well as software in Excel from University of Alabama. Search "miniiRefprop" or "Excel in ME" to find.
thank you for your reply sir. but I'm really confused because my values are not close. And now i found out that books have different values. here it is, Based on Moran&Shapiro: T= -12c P= 185.4 h= 240.15 s=0.9267 Based on Borknakke&Sontag: (My book) T= -12c P= 187.02 h= 391.05 s= 1.7333 that's a big difference sir. so what should i follow? Goodbless you.
Very clear explanation. I've used Thermodynamic properties of HFC-134a by Dupont, and got the same results. Thanks a lot.
thanx for this important video>>realy it is helpful
h2 can be approximated by interpolation using tables since we know state 2 is superheated and we also know s2
Could you teach me how to interpolate using the table
how can we get entropy on state 4?
where did you get the H2? what was the computation?
+Jerom NamGuz Ed state 2 is "fixed" by knowing p2 and s2=s1. I probably used software in excel, call something like: h_ps_R134a(p2, s2).
surely there is a way of getting that value not using software? will I be able to find h2 with R134a saturation table ?
Hello, can I ask how to get h2 manually without using software? Is there a formula on getting h2?
u can go to the superheated table of r134a and search of P2 then found 2 values of entropy between s2 and make the interpolation to finde h2
@@wailmhd5558 You fucking life saver. Thank you so much. Idk why these guys can't just say this in their videos or comments.
why doesn't this have more views?
Very informative and straight to the point, well explained too!
how can u find the value of h2?
i can't understand.
same here
noice. keep it up well explained
Like!
Hi, what books do you recommend on this subject?
We use engineering thermodynamics textbook like: Moran M.J., Shapiro H.N., Boettner, D.D., and Bailey B.B., Fundamentals of Engineering Thermodynamics, John Wiley and Sons,. OR another good textbook is Yunus Cengel and Michael Boles, Thermodynamics: An engineering approach, McGraw hill. Any edition of these books in past 10 years is good.
@@randallmanteufel6411 Thank you do much! Congratulations for the excelent class!
Very good work
thanks
very helpful
can i use some kind of property relation to find out h2,if not to use software and only table ?
i think he used R 134 a
how did you get the enthalpy, x, entropy? what table or chart did you use?
+Kevin Aton Either used property tables in back of textbook: M.J. Moran and H.N.
Shapiro, Fundamentals of Engineering
Thermodynamics, 8th Edition, Wiley and Sons, 2014.
OR from Excel Add-in from Univ of Alabama, www.me.ua.edu/ExcelinME/thermo.htm
Both give very similar values (but not exactly the same).
it 300 plus here. please help me out. i've been wondering this for almost 5 hours
some may be from software, but values of properties are close in numerical values to tables in the textbook. I just don't remember. I like REFPROP software as well as software in Excel from University of Alabama. Search "miniiRefprop" or "Excel in ME" to find.
thank you for your reply sir. but I'm really confused because my values are not close.
And now i found out that books have different values. here it is,
Based on Moran&Shapiro:
T= -12c
P= 185.4
h= 240.15
s=0.9267
Based on Borknakke&Sontag: (My book)
T= -12c
P= 187.02
h= 391.05
s= 1.7333
that's a big difference sir. so what should i follow? Goodbless you.
we can't use softwares in exam. only calculator and ballpen. but i'll try using that here