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Indicative Mean Effective pressure & Indicated Power

 INDICATIVE MEAN EFFECTIVE PRESSURE :

 It is defined as the algebraic sum of the mean pressure acting on the piston during one complete cycle. It is obtained from the indicator diagram drawn with the help of  an engine indicator.

Pm = ( ( Ap - An) / L ) * S bar or kN / m2 


INDICATED POWER :

Indicated Power is the rate of work done by the products of combustion on the piston. It is the power actually developed by the engine cylinder. 

IP = Pm * l * a * n * k  kW 

Where Pm = Indicative mean pressure ,

              l   = Length of the stroke in m.

              a = Area of the piston in m2.

              n = Number of working stroke per sec.


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