【Daily Question】Theoretical Foundation 2021.1.29
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Multiple-choice question: The question is shown in the image ( ). Answer: A. Hint: An additional reward will be given to those who can explain the solution process; the answer can be submitted there
(A) Steady flow, element, reversible process. Enthalpy is the total energy of a working fluid as it flows through an open system; it has no practical meaning in a closed system. The formula in the question uses lowercase h, and there are no time-dependent quantities, so it represents a steady flow. In the second expression of the first law of thermodynamics, δq = dh + δwt, the technical work for a reversible process is δwt = -vdp.