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Question

A four stroke petrol engine has a compression ratio of 10.5, takes air at 90 kPa and 40C and is repeated 2500 times per minute. Using constant specific heats
(cp=1.005kJ/kgK,cv=0.718kJ/kgK. and γ=1.4) at room temperature, then the rate of heat input is _____ kW. if the cycle is to produce 900J/cycle.
  1. 61.515

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Solution

The correct option is A 61.515


The definition of cycle thermal efficiency reduces to

ηth=11rγ1=1110.51.41=0.6096=61.0%

Wnet=900×25001000×60=37.5 kW

The ratio of heat addition is then

Qin=Wnetηth=37.5kW0.6096=61.515kW


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