Hints for SP26 to 28 (1)

# Hints for SP26 to 28 (1) - SP26 to 28 Hints This problem is...

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SP26 to 28 – Hints This problem is almost the same as Example 26.2 covered in class - see solutions for it on Blackboard (Home Page › Solved Examples) System sketch:

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Solution outline: Goal here is to show whether or not the increase of entropy principle is violated in this case. This means, you must calculate the total entropy generation during the process. i.e.: if S air + S surroundings = gen 0, claim is true, otherwise it is false. Note that S surroundings makes use of: q surroundings , in magnitude equals the heat rejected from the system T surroundings , the temperature outside the system, given to you as 27 C You can determine q air from energy balance, basic equation for U and assumptions Negative q air indicates heat rejected from the system during the compression process From the surrounding point of view, this heat is added => q surroundings = -q air Adding S air and S surroundings leads to a negative total entropy generated => IMPOSSIBLE!
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Hints for SP26 to 28 (1) - SP26 to 28 Hints This problem is...

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