Thermodynamics - 7-12 Isentropic Efficiency example 2

[@sunmichoi6888]

Thank you so much!

[@zaynmoaaz8504]

[@Azakadune]

My professor never game is the T1/T2= P2r/P1r relation, it isn’t even in my book after skimming. I assumed constant specific heats and used the K=cp/cv and the isentropic +ideal gas formulas to find T2, I was 0.6 percent off from your solutions. Close enough I say… my prof loves to approximate stuff it seems, doubt he’d care. So many assumptions already in engineering, what’s one more? Lol.

[@harisharan418]

Is there a video for isentropic efficiency for r134a vapor compression cycle? .... involving heat pumps

[@OpioIsaac-e4n]

What does pr1 and pr2 stand for

[@ErtuğrulKoçak-o7r]

at 8.04 why the adiabatic efficiency equal to 0.8?

[@engineeringdeciphered]

It said in the problem statement that the adiabatic efficiency is 80 percent

[@oosnxp]

Wouldn't the final answer be negative since it is a power input into the compressor?

[@engineeringdeciphered]

Most thermo books will say Q-W= delta E, and denote “work out” as positive. But I like to say Q+W= delta E and denote “work in” as positive.