Engineering Thermodynamics

[khansisters]

a compressed air bottle of 0.3m^3 volume contains air at 35 bar, 40 °C.this air is used to drive a turbo generator supplying power to a device which consumes 5W. CALCULATE TIME FOR WHICH THE DEVICE CAN BE OPERATED IF THE ACTUAL OUTPUT OF THE TURBO GENERATOR IS 60% OF THE MAXIMUM THEORETICAL OUTPUT. THE AMBIENT PRESSURE TO WHICH THE TANK PRESSURE HAS FALLEN IS 1 BAR. FOR AIR γ=1.5 & STATE ANY ASSUMPTIONS IF MADE.

[New Judge]

Homework? Coursework?

How about "I've tried my best with this problem but I'm still having trouble. Can anybody out there kindly help me?"

It might get better results.

[Baldric]

Homework?

[AuntLydia]

25 minutes

[bookbinder]

The word 'please' might improve your chances of getting an answer.

[Peter Pedant]

hey like the name
There was a Dr Who episode about the Sisterhood of Khan
and I note there is an arabic verb system - kan wa ukhtiha - Kan and her sisters

er right the prob - they give you gamma ( 1.5 ) so you need to use the formula for adiabatic expansion. p.v to the gamma. The pressure drop is going to be 34 bar

and this gives you the work done
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/adiab.html

say it is x - then you can use 0.6 of x - and you are gonna consume at 5W or 5 j s-1
so divide by five and it will give you the number of seconds you can run it for

I think

I didnt do engineering thermodynamics at uni
I um er did medicine and law
there may be an engineer knocking around ( not drinking in a pub or playing sport)
you should be thankful you are not doing this is FPS units

[Peter Pedant]

o come on boys
four answers of 'I'm not at home to Mr Rude!" ?

[Flonska]

Are you connected in any way to this organisation?

https://www.khanacademy.org/

[Peter Pedant]

three questions
and he hasnt even put pencil to paper .....