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Efficiency



Nearly 80 % of the fuel energy is 'lost'.
Petrol engine (indirect injection)25 - 35 %
Petrol engine (direct injection)bis 37 %
Diesel engine (secondary combustion chamber)35 - 40 %
Diesel engine (direct injection)bis 45 %
Automatic/manual gearbox 85 - 95 %


The mechanical efficiency refers to the delivered performance compared to the power input. In view of the fact that the deliverded performance is always lower, the degree of efficiency must thus be less than 1. The closer it is to 1, the better the energy yield is. The degree of efficiency lies between 0 and 1, or expressed in percentage, between 0% and 100%. The degrees of efficiency of devices running in series are fundamentally multiplied.

It is a measure of the of the energy conversion quality.

     Pe
=
        Pi

Pe = Pi ·

      Pe
Pi =
         

       Pab
=
        Pzu

Pab = Pzu ·

          Pab
Pzu =
           

Check your calculation!     Do you need help?
Please enter numbers only in two of the three fields!
Pi
Pzu 		Specified power
input 		kW
Pe
Pab 		Effective power
output 		kW

Eta		 Efficency

Multiply efficiencies ...

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Translator: Don Leslie - Email: lesdon@t-online.de

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