Since we have a closed system we can write this equivalently as To evaluate this we will need to perform a 1 st law analysis. Now calculating the entropy change of the universe which violates our 2 nd law, so that the heat transfer measurement is wrong. Then the work may be calculated from the 1 st law 2. He claims that there is no work or heat transfer involved in the device. Evaluate this claim.
Bold values are calculated, italicized values are from air tables.
Our conservation of mass is given by and our conservation of energy is given by Substituting for from mass into our energy equation we have Now solving for and So we could now calculate our rate of entropy production , except we need to have entropy changes. So the device is possible.