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A steam power plant receives heat from a furnace at a rate of 280 GJ/h. Heat...

A steam power plant receives heat from a furnace at a rate of 280 GJ/h. Heat losses to
the surrounding air from the steam as it passes through the pipes and other components
are estimated to be about 8 GJ/h. If the waste heat is transferred to the cooling water at a rate
of 145 GJ/h, determine (a) net power output and (b) the thermal efficiency of this
power plant

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Solution:

The rate of heat supply and heat rejection of a power plant are given. A steam power plant receives heat from a furnace at a rate of 280 GJ/h. Heat losses to the surrounding air from the steam as it passes through the pipes and other components are estimated to be about 8 GJ/h. We have to determine the a) net power output and (b) the thermal efficiency of this power plant

We have to assume that (1) the plant operates steadily,(2)heat losses from the working fluid at the pipes, and the other components are taken into consideration.

(a)The total energy rejected by this power plant is

Then the net power output of the plant becomes

(b) The thermal efficiency of the plant is determined from its definition itself,

%

genius_generous answered 2 years ago
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