w is negative because its work done BY the system. in the end result in this video, W is negative showing -(-W). meaning work W+ is being done ON the system. hope that helps
Cp can be used if the pressure changes. It is a property of a fluid and is a function of temperature. Sometimes an approximation is made where the value of Cp is assumed constant and determined at some average temperature.
For axial compressors the axial velocity remains unchanged.
we can use this formula to find Cp = (gamma * R) / (gamma - 1) ; Gamma of Helium = 1.67
Thank you Professor.
E in = E out
W + H1+ KE1 +PE1= H2 + KE2 + PE2 + [-Q)
Thus;
W+Q = 🔼H +🔼KE + 🔼PE
Not Q-W, correct me if I'm wrong sir.
w is negative because its work done BY the system. in the end result in this video, W is negative showing -(-W). meaning work W+ is being done ON the system. hope that helps
Why did you use Cp (constant pressure coefficient) when the pressure has changed during the process?
Cp can be used if the pressure changes. It is a property of a fluid and is a function of temperature. Sometimes an approximation is made where the value of Cp is assumed constant and determined at some average temperature.
I can't believe it. Completely wrong, it requires the Pressure times volume product. This is the main requirement of Compression Work.
thank you so much
What do you do if Q is not given
Richard Ampofo Probably can assume it’s adiabatic
yupp
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