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[GTE]

Hi,
when you look at the brayton cycle on a T S diagram, you can see those isobars. which looks like exponentials. I would like to do an excel diagram of a gas turbine cycle and wonder what are the equations of these isobars. Because my sketch does look nothing like the proper TS diagram.

in other words, my questions is how do you calculate the entropy of dry air for different pressures?

can somebody help.

Thanks,