Homework Help: Need help regarding finding out the max pressure in a isothermal cycle.

1. Aug 16, 2007

cochrad

A volume of 1.5 m3 of air initially at 1.31 bar and 293k undergoes three processes in order to complete a cycle:

Process
1 to 2 Isothermal compression from state 1 through a volumetric compression ratio of Rv to state 2
2 to 3 Isobaric heating back to the original volume.
3 to 1 Isochoric cooling back to state1.

How do i find the max pressure in the cycle?

Thanks

2. Aug 16, 2007

mgb_phys

By knowing what the three iso.... words mean.
You don't need any of the numbers or any equations - you just have to understand what the gas is doing.

3. Aug 16, 2007

cochrad

i know what the three iso's mean. could you supply a little more help plz

4. Aug 16, 2007

mgb_phys

You need to know that PV/T = constant

The gas is compressed but at the same temperature so pressure does up.

Isobaric means no change in pressure.

Volume is constant but cooled so pressure goes down.

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook