Calc Vapor Compression Refrigeration Cycle R134a

[@carlosalbertoperez3018]

Very clear explanation. I've used Thermodynamic properties of HFC-134a by Dupont, and got the same results. Thanks a lot.

[@nadia675123964523965]

Very informative and straight to the point, well explained too!

[@Saf1Isti]

why doesn't this have more views?

[@kerixenkalid1323]

What calculator did you use to calculate h2

[@rojemdeguzman5195]

where did you get the H2? what was the computation?

[@randallmanteufel6411]

+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).

[@alexwalker8521]

surely there is a way of getting that value not using software? will I be able to find h2 with R134a saturation table ?

[@terranetti556]

h2 can be approximated by interpolation using tables since we know state 2 is superheated and we also know s2

[@joshmarkirk120]

Could you teach me how to interpolate using the table

[@elnarddelaspenas6672]

Hello, can I ask how to get h2 manually without using software? Is there a formula on getting h2?

[@wailmhd5558]

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

[@causeformayhem]

@@wailmhd5558 You fucking life saver. Thank you so much. Idk why these guys can't just say this in their videos or comments.

[@AryanKumar-kg9ym]

how can u find the value of h2? i can't understand.

[@andrepicard6754]

same here

[@توفيقكيارب-ب4ح]

thanx for this important video>>realy it is helpful

[@rolesison9179]

noice. keep it up well explained

[@yosoyanita1006]

how can we get entropy on state 4?

[@mohammedabdelwahabsharafel2515]

Very good work

[@alinedeboleto]

Hi, what books do you recommend on this subject?

[@randallmanteufel6411]

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.

[@alinedeboleto]

@@randallmanteufel6411 Thank you do much! Congratulations for the excelent class!

[@AirsofterAton]

how did you get the enthalpy, x, entropy? what table or chart did you use?

[@randallmanteufel6411]

+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).

[@Chess.Infinity]

it 300 plus here. please help me out. i've been wondering this for almost 5 hours

[@randallmanteufel6411]

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.

[@Chess.Infinity]

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.

[@Chess.Infinity]

we can't use softwares in exam. only calculator and ballpen. but i'll try using that here

[@prajwalkapoor1547]

can i use some kind of property relation to find out h2,if not to use software and only table ?

[@AHMEDNaSSer-ek6hq]

i think he used R 134 a

[@sheyhan1]

very helpful

[@farishakim4867]

thanks

[@armindoferreira5886]

Like!