- #1
zandbera
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Homework Statement
Argon enters a turbine at a rate of 80.0 kg/min, a temperature of 800.C, and a pressure of 1.50 MPa. It expands adiabatically as it pushes on the turbine blades and exits at pressure 300 kPa. (a) Calculate its temperature at exit. (b) Calculate the maximum power output of the turning turbine. (c) The turbine is one component of a model closed-cycle gas turbine engine. Calculate the maximum efficiency of the engine.
Homework Equations
e = Weng / Qh = 1 - Qc / Qh
PV/T = constant ( i think)
The Attempt at a Solution
for part a), i used PV/T = constant to try and figure out the temperature, but I am not given a volume, and i don't know how to figure it out. I am assuming you have to use the flow rate, 80.0kg/min but i don't know how. i have the equation for the final temperature:
Tf = (800 C)(1.5MPa)Vf / (300 kPa)Vi
but i don't know the volumes, and i also don't understand why the pressure drops. i know that as the velocity of something moving through a hole increases the pressure decreases so is that what's happening? and i also know that as the volume drops, the pressure increases( i think?), so that would mean that Vf would be higher?
i just need some guidance on this one