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Question: when do you use table a4 properties of superheated water...

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when do you use table A-4 properties of superheated water vapor

how do you know if it is closed system in the problem

ex) 7.11 7.11 A system consists of 2 kg of water at 100°C and 1 bar. if the system is at rest and zero Determine the exergy, in kl, elevation relative to an exergy reference environment for which To 20°C, po1 bar

so in this question i know i have to use table A-4, but why?

and why do you use exergy for closed system?

you do not have to solve the problem.

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