What is Vr in thermo

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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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
 

stewartcs

Science Advisor
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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
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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