Vr in Thermo: What is It and What Is It Used For?

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Vr refers to the volume ratio, often associated with the compression ratio in thermodynamics, particularly in the context of the Otto cycle. It is used in calculations involving ideal gases and can help determine internal energy values. Users expressed confusion over its definition and application, noting that while their texts provided Vr values, they did not explain its significance. The discussion highlighted the need for clarification on Vr's role in thermodynamic equations and its relevance in engineering software like EES. Understanding Vr is essential for solving problems related to internal energy in thermodynamic cycles.
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what is Vr... I know how to get Vr from my text but not sure what it is and what its used for...Im trying to find values for internal energy for an otto cycle question...im working on EES but only know how to get the values for Vr from the text
 
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Darknes51986 said:
what is Vr... I know how to get Vr from my text but not sure what it is and what its used for...Im trying to find values for internal energy for an otto cycle question...im working on EES but only know how to get the values for Vr from the text

what is Vr?:confused:
Is it some function in EES? or is it the compression ratio?
 
I think it is used in an ideal gas formula and is used also in calculating for properties in the otto cycle...I was just curious because I had a homework problem where the answer guide used Vr but the text did not use Vr in any of its examples even though it had a list of Vr values. I don't know what Vr is called either... Good thing the final didn't have a problem like that on it
 
Darknes51986 said:
what is Vr... I know how to get Vr from my text but not sure what it is and what its used for...Im trying to find values for internal energy for an otto cycle question...im working on EES but only know how to get the values for Vr from the text

Doesn't ring any bells off hand. I'll look through some Thermo text's and see what I can find...although it should be in your text if it uses it.

CS
 
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