What is heat balance diagram for a thermal power plant?

Question

What is heat balance diagram for a thermal power plant?

Answer 1

This is a diagram that is generally one of the first produced by an engineering company when given the specifications of the project by the customer.  It is usually one of the first diagrams that in a group of diagrams known as the process control diagrams, or PCDs, and these usually accompany the P&IDs since they are the prelude drawings to the P&IDs.  

Depending on the type of power plant all of the flow paths of energy are outlined in a basic layout of the power plant.  They show all the places where energy enters the system such as fuel and large pumps, where energy that would normally be lost is recovered such as a pressurized blowdown tanks steam recovery to a deaerator and extraction steam, and where energy is lost such as to the condenser and cooling water or ambient.

Usually these diagrams have three basic scenarios associated with each point on the diagram:  One for startup, steady state full power, and shutdown conditions.

Answer 2

energy supplied to an engine is the heat value of the fuel consumed. only a part  of this energy is converted into useful work rest either waste as exhaust gas ,cooling system and unaccountable losses

                taking a thermal power plant the MW which we get is the useful work, rest is lose of heat in exhaust gas of the fuel burnt, then the other lose is in the condenser where steam after doing work is converted back to liquid form,and the the unaccounted heat which goes as loss in friction, conversion losses and some other constraints.

    the diagram is drawn using energy input along y axis and engine speed along x axis