Intro Carnot refrigeration cycle

Schematic: 0:06
Property Table and States: 3:19
T-s Diagram: 6:38
Heat Transfer, Work, and Coeff. of Perf.: 10:49
Summarize Carnot refrigeration cycle with vapor compression and condenser

[@mattklinger8644]

Great video. I have used a lot of your intro to cycles to supplement my thermo I class. I might take thermo II and if I do I will use your videos again to help prepare myself before the semester begins.

[@abubkermahmoud3289]

very useful .. thank you professor

[@maria-wl4xt]

Sir can you help me . I'm confused that when heat is transfered to the refrigerant in the evaporator so why its temp. doesnt increase .
I cant understand how heat is rejected or absorbed at constant temp

[@gooddeedsleadto7499]

Does it mean evaporation and condensation are not only isothermal processes they are also isobaric processes? Thanks

[@randallmanteufel6411]

yes, constant temperature and constant pressure, both for evaporator and condenser

[@donkeenan6286]

how do you calculate the X4 and H4? Anyone - what is the formula?

[@randallmanteufel6411]

+Don RE isentropic expansion through "turbine" so pressure and entropy fix the state 4. p4=Plow=P1, s4=s3. then x4 = (s4-sf)/(sg-sf) then h4 = hf + x4*(hg-hf).

[@donkeenan6286]

Thanks this you tube clip has cleared everything up with regards to how it all fits together. I am doing distance learning which is very difficult to understand the book at times. Just go to learn how to plot performance characteristics of a refrigeration system as functions to condenser and evaporator water leaving temperatures.
Thanks Don

[@ryanlachmayr8431]

my text book says that the saturated vapor occurs at point 1?
" refrigerant entering the compressor is assumed to be a dry saturated vapor" P. 532 Heating, Ventilating, and Air Conditioning 6th edition

[@randallmanteufel6411]

Carnot refrigeration cycle is not same as traditional vapor compression refrigerator cycle.

[@wyattcap]

true?

[@anoopchandran1609]

sir can u plz upload classes on refrigeration and air conditioning problems im really confused with the enthalpies and entropies to be considered from the given data i will be very thankful for your favour

[@randallmanteufel6411]

please check engineering.utsa.edu/~rmanteufel/ , it is a little out of date, but I tried to organize by class/lectures/topics. I haven't taught a class focused on refrigeration and air-conditioning.

[@Joe-os2dd]

TRUE *goes to the exam circles everything true gets D-

[@alexmorris1994]

turban lol

[@heythembelghoula2867]

I don't think That T1 = T4 , because its Out of an evaporator ! I guess T1>T4 , That's what i Learned !
Even T2 and t3

[@randallmanteufel6411]

+Heythem Belghoula T1 equals T4. State 1 is out of evaporator and state 4 into evaporator. But evaporator is constant pressure, and both states are 2-phase liquid-vapor mixture, so T1=T4=Tsat(Pevap). There is heat transfer to fluid in the evaporator yet temperature does not change. Many students struggle with this.

[@heythembelghoula2867]

+Randall Manteufel ah ! i see now , thank you very much Sir .

[@ntshuxekoshibiti1514]

t1=t4 everyone knows

[@maria-wl4xt]

@@heythembelghoula2867 can you tell me as Im confused that when heat is transferred to refrigerant in evaporator so why its temp and pressure still constant after getting heat ????

[@moejoe7465]

@@randallmanteufel6411 Would T1 still equal T4 in a vapour compression cycle, (in a non Carnot cycle)