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The world's population has grown rapidly since industrial
revolution. The extension of human activity, which have greatly
increased the greenhouse warming potential gas-carbon dioxide,
led to damaging effects on living material as well as
environment. The greenhouse effect may be reduced by utilized
waste heat effectively. A theoretical study of the cogeneration
system is thus proposed. In the heating process, the boiler
tubes consists of superheated, saturated, and subcooled
sections. It is shown that the saturated area of the boiler
tube increases with exhaust mass flow rate whereas the
superheated region decreases with the mass flow rate of heating
gas at a fixed outlet exhaust temperature. No significant
change of the subcooled portion is observed. On the other hand,
the saturated and subcooled areas, at a fixed mass flow rate of
exhaust gas, increase with exhaust temperature. In addition,
the power consumption of the working fluid's circulating pump
increases as the outlet temperature of the exhaust gas
decreases. The more the net turbine work produces, the lower
the outlet temperature of working fluid in the condenser for a
fixed mass flow rate of exhaust gas.
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