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

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Homework Help Overview

The discussion revolves around determining the maximum pressure in an isothermal cycle involving a gas. The cycle includes isothermal compression, isobaric heating, and isochoric cooling processes, with specific initial conditions provided.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are discussing the meanings of the processes involved in the cycle and how they relate to pressure changes. There is a request for clarification on how to find the maximum pressure without delving into specific equations or numerical methods.

Discussion Status

The discussion is ongoing, with some participants providing insights into the relationships between pressure, volume, and temperature in the context of the processes. However, there is no explicit consensus on how to approach the calculation of maximum pressure.

Contextual Notes

Participants are navigating the definitions of isothermal, isobaric, and isochoric processes while considering the implications of these definitions on pressure changes throughout the cycle.

cochrad
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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
 
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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.
 
i know what the three iso's mean. could you supply a little more help please
 
You need to know that PV/T = constant

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

Isobaric heating back to the original volume.
Isobaric means no change in pressure.

Isochoric cooling back to state1.
Volume is constant but cooled so pressure goes down.
 

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