Steam Expansion in a Nozzle
- Calculate the exit steam velocity of steam expanding from 260℃ and 7.00 bar to 200℃ and 4.00 bar in a nozzle.
- Calculate the heat input required to heat saturated steam from 100℃ to 400℃ at constant pressure and constant volume.
- Explain the physical significance of the difference between the heat inputs in continuous flow and constant-volume processes.
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問１ Steam at 260℃ and 7.00 bar absol
問１ Steam at 260℃ and 7.00 bar absolute is expanded through a nozzle to 200℃ and 4.00 bar. Negligible heat is transferred from the nozzle to its surroundings. The approach velocity of the steam is negligible. The specific enthalpy of steam is 2974 kJ/kg at 260℃ and 7 bar and 2860 kJ/kg at 200℃ and 4 bar. Use the open-system energy balance to calculate the exit steam velocity. 問２ Saturated steam at 100℃ is heated to 400℃. Use the steam tables to determine (a) the required heat input (J/s) if a continuous stream flowing at 100 kg/s undergoes the process at constant pressure and (b) the required heat input (J) if 100 kg undergoes the process in a constant-volume container. What is the physical significance of the difference between the numerical values of these two quantities? 和訳と回答をお願いします(>_<)
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