mollier chart
mollier chart
(OP)
hiiii..
i want to know how to find enthalpy when only tempreture is given in isentropic process
example-(1) p4= 0.07375 bar ; dryness fraction x4= 0.85; so h4=2220
(2)isentropic process T3=400 degree celsius ;find p2 and find h3
usually 2 value are enough to calculate enthapy or entropy but how to h or s when only one value is given?
i want to know how to find enthalpy when only tempreture is given in isentropic process
example-(1) p4= 0.07375 bar ; dryness fraction x4= 0.85; so h4=2220
(2)isentropic process T3=400 degree celsius ;find p2 and find h3
usually 2 value are enough to calculate enthapy or entropy but how to h or s when only one value is given?





RE: mollier chart
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RE: mollier chart
The enthalpy of steam at 0.07375 bara and quality of 0.85 is 2213 kJ/kg (instead of 2200). Next you must find the entropy:
s(0.07375 bara, 2213 kJ/kg) = 7.105 kJ/(kg*K)
Now you can find the enthalpy of the inlet steam. Using equation for temperature T(h,s), by trial-and-error you find that the enthalpy is 3247 kJ/kg. It took me a few seconds to find the value.
Using equation p(h,s) you find pressue. It is 21 bara.
Good luck in your thermodynamic calculations and next time find another board, eng-tips is for professionals, not students.
RE: mollier chart
RE: mollier chart
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
RE: mollier chart
RE: mollier chart
Well maybe its a trick exam question
RE: mollier chart
Old Charts do not have BARS or KJ/kg.
Thanks.
RE: mollier chart
RE: mollier chart