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The purpose of this research is to study the thermal
efficiency-economic analysis of cogeneration plants. The system
performance is evaluated on the basis of thermal efficiency
which is calculated using an energy balance method for the
system. Since in the thermal efficiency, The performance is
evaluated the exhaust， inlet state of steam turbine, condensed
condition of condenser and steam. The economic analysis is using
the Return On Investment (ROI) method. Finally, The optimal
model is to establish for the system. As
a concluding remark, the results presented here will be a good
reference to the operating condition of a practical running
(old) cogeneration plants. On the other hand, the simulation
model provides a reference to the design work of a new
cogeneration plants.
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