Turbine & Jet Condenser | Open System Analysis | Thermodynamics

Welcome to Engineering Hack! In today's video we have a combined system with a steam turbine and a jet condenser. We are slowly introducing more processes and combining them with one another. However,, the way we solve this is exactly the same way we've been solving the problems when they were individual processes. Firstly, note that the first state is completely defined and I've skipped the definition of it because we've done plenty of those problems here in the channel already. Then, note that we have liquid water being added to the jet condenser and that the output of the condenser must be water (after all, it *condenses* vapor). This leaves the problem with an interesting setup, because we have only one state that is completely in the dark - state 2. And to define it, we'll have to see state 2's incoming energy/mass and its outgoing energy/mass. Remember this is steam, so no ideal gas equation should be used, instead, we'll be using steam tables throughout the whole problem. Be sure to know how to read them!

Problem statement: Steam at a pressure and temperature of 1MPa and 200°C enters a turbine (see figure) where it is expanded adiabatically to a pressure of 10kPa. The steam then enters an insulated jet condenser where it mixes with and is condensed by a jet of water at a temperature of 20°C and a mass flow rate of 5kg/s. The water leaves the condenser at a temperature of 45°C.
For a power output from the turbine of 150kW, calculate the:
a) steam consumption (kg/s);
b) enthalpy at the exit from the turbine;
c) quality at the exit from the turbine.

Answer:
a) 0.255 kg/s
b) 2239.8 kJ/kg
c) 85.61%

To learn more please watch the video till end and if you have a question just ask in the comments section.
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