Change in Input energy

Aslo please tell what wil happen if Qg decreases to 200 kW

Posted by:
piyusharas
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my initial assumption

What do you think will happen?

What doubt?

Why on earth would there be a change in input energy?

Something happened.

Firstly, you did not state the entire system. The generator is not turning itself, is it? What is turning the generator, gas turbine, ICE, steam turbine? Where is the source of evaporator input energy, boiler stack, HRSG stack, gas turbine exhaust, ICE exhaust?

Generally speaking all of these machines will increase mass flow of exhaust when the load (and hence the fuel burn) increases on the generator. The mass flow of heat to the evaporator follows this, and so must available heat for transfer at the evaporator, up to the limits of heat absorption by the evaporator.

To hold your refrigeration constant with increasing load on the generator, you will have to introduce bypass flow of the evaporator output, such that this bypass will be cooled and condensed without producing any refrigeration effect at the refrigeration load, if that is what you intended to do. When decreasing load on generator appears, there will be a point at which bypass must close, and a further point at which the evaporator is under-driven, and the refrigeration load overcomes refrigeration output.