Efficiency Increasing System by Using Preheating Method


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The concept of increasing the fuel efficiency of a petrol engine in this project, is to pre-heat the intake air which is flowing through the carburetor. The humidity in the atmospheric air affects the petrol vapourisation in the carburettor. Therefore, by pre-heating the inlet air to the carburettor for a considerable amount, the vapourisation can be ease and in turn complete combustion is achieved. Moreover by reducing the water vapour to the engine, the steam formation in the engine can be reduced pitting of the engine cylinder, piston and exhaust pipe.

Reference: Most of the cars in today’s market give a maximum of 30 to 40 miles per gallon and hybrid cars giving upto 50 miles per gallon. The efficiency of Internal Combustion Engines used for this purpose is very low, about 25%. The heat generated during the combustion of fuel is converted into work to drive the car is wasted to the atmosphere, as anti-freeze(Ethylene Glycol) is used to cool the engine and circulated through a radiator which transfers the heat to the atmosphere. The heat generated by combustion of fuel such as gasoline or diesel is converted into the work because of the pressure created by the combustion process.

In this invention, the heat is recovered by pre-heating/pressurizing the fresh air used for the process of combustion. The temperature of the pre-heated fresh air used for combustion is increased to above 1400 degrees Fahrenheit by passing through a heat exchanger to recover heat from combustible gases. Fresh air for combustion is heated to about 1400 degrees Fahrenheit. According to Thermodynamic Laws, by heating the air in a closed space with constant volume at room temperature to 1600 degrees F., the pressure is increased about to 50 psi. In order to have a higher pressure, the fresh air is first compressed upto 100 psi before passing through a heat exchanger. This will give the available working pressure of about 350 psi before

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