Seeking high-score help: the meanings of isenthalpic and isentropic
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As the title suggests: I’m seeking high-quality assistance regarding the differences between isenthalpic expansion and isentropic expansion. Throttling expansion is considered isenthalpic, while expanders involve isentropic expansion. Why is it said that isentropic expansion is more effective than isenthalpic expansion? Thank you very much. I hope theory and practice can be combined; thank you very much.
It’s hard to explain this thing in just a few words. It is at least related to the purpose of expansion and the investment capacity.
Every process in nature proceeds in the direction of increasing entropy, and the greater the increase in entropy, the greater the degree of irreversibility. At the same time, the greater the increase in entropy, the more energy is lost, and the lower the efficiency (for example, the heat generated by friction is irreversible). In theory, an expander is isentropic, but in practice it also moves in the direction of increasing entropy. The increase is only small, indicating that its efficiency is relatively higher than that at constant enthalpy. Moreover, in some large-scale chemical processes, both isentropic expansion and isenthalpic expansion are used, but isentropic expansion is employed in over 90% of cases, with less than 10% using isenthalpic expansion. This is done for economic reasons, as it offers higher efficiency and enables recovery.