Isothermal or adiabatic process

AI Thread Summary
An isothermal process occurs at a constant temperature, while an adiabatic process involves no heat exchange with the surroundings. The discussion highlights the importance of understanding these concepts through practical examples, such as the ideal 4-stroke internal combustion engine and refrigeration cycles. In refrigeration, the four basic steps include compression, condensation, expansion, and evaporation, with the expansion step being isenthalpic as well as adiabatic. A p-v diagram can effectively illustrate these processes and their relationships. Clarifying these concepts is essential for grasping thermodynamic cycles in engineering applications.
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:confused: :confused: i was reading my lecture note over the half term but i am still a bit confused and i was wondering if someone could describe in detail, using a p-v diagram, a well known engineering cycle which specifies a isothermal or adiabatic process.

Thanks you very much
 
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Have you tried to understand what happens in an ideal 4-stroke IC engine?
 
Consider a simple refrigeration process. What are the four basic steps in the process and how can you model them?

Note: One of the four steps can be isenthalpic as well as adiabatic. Which one is it?
 

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