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Turbines, Compressors, ExpandersCogeneration is often used
Chapter 4, Problem 86HP(choose chapter or problem)
Problem 86HP
Turbines, Compressors, Expanders
Cogeneration is often used where a steam supply is needed for industrial process energy. Assume that a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and boiler, the setup in Fig. P4.86 is used to extract the supply from the high-pressure turbine. Find the power the turbine now cogenerates in this process.
FIGURE P4.86
Questions & Answers
QUESTION:
Problem 86HP
Turbines, Compressors, Expanders
Cogeneration is often used where a steam supply is needed for industrial process energy. Assume that a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and boiler, the setup in Fig. P4.86 is used to extract the supply from the high-pressure turbine. Find the power the turbine now cogenerates in this process.
FIGURE P4.86
ANSWER:
Solution 86 HP:
Step 1 of 3:-
Here we have to find the power cogenerated by the turbine in the given process.
The mass flow rate of steam is,
.
The required pressure is, .
By the adiabatic approximation,
.
The continuity equation is,
.
The energy equation can be written as,
