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Old Jan 16th 2018, 09:04 AM   #1
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closed system. help !

I'm very new here, please forgive me for bringing what i hope is a begginers question to an advanced thermo forum, but i've asked in several other places and not found a sensible answer

In a given closed system ( ie heat and work can cross the system boundary, mass cannot ) a process occurs such that

delta U=0 (no change in internal energy)
delta H=0 (no change in enthalpy)
delta W=0 (no work crosses the system boundary )
Q is positive (heat enters the system )

Is this possible ?
i believe it is not, but if i am wrong, what sort of process might it be
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Old Jan 16th 2018, 11:54 AM   #2
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Moved to Thermodynamics and Fluid Mechanics forum.

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Old Sep 17th 2018, 06:31 PM   #3
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You can work in this problem using the entropy definition. The second law requires that
entropy production be positive or zero. By contrast, the change in entropy of the system may be positive, negative, or zero.
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