The Internal combustion engines are those heat-engines that burn their fuel inside the engine cylinder. On the other side, external combustion engines are those heat engines that burn their fuel outside the engine cylinder. Thes are steam engines. The energy developed during the combustion of fuel then transmitted to steam, which acts on the piston inside the cylinder. In internal combustion engines, the chemical energy stored in the fuel is converted into heat energy by combustion. The heat energy is then converted into mechanical energy by the expansion of gases acts against the piston attached to the crankshaft which can rotate. The engines that bun petrol are known as petrol engines. Other types of internal combustion engines burn heavier oils, of these types the diesel engine has come into the widest use.
|Internal combustion engine Or IC Engine.|
I.C. ENGINE AND STEAM ENGINE COMPARISON
Both I.C. engines and steam engines are basically heat engines and convert heat energy into mechanical energy- But IC. engines are now widely used for this purpose due to some reasons. The class of service is the main factor in many cases. One of the outstanding uses is in the field of transportation. In many industries, farms, simplicity and low cost of operation are the determining factors in the adoption of I.C. engines. The main differences between the I.C. engine and steam engine are as follows:
- In I.C. engines, the combustion of fuel takes place inside the engine cylinder, while in steam engines, the combustion of fuel takes place outside the cylinder.
- The working temperatures and pressures in I.C. engines are much higher than in steam engines.
- Due to high temperatures and pressures, materials having better resistance are required for IC. engines.
- I.C. engines are single acting. The piston is directly connected to the connecting rod. There is no piston rod and hence no stuffing box.
- I.C. engines have high efficiency as compared to that of steam engines.
- The steam engine requires a big boiler to store water for converting it into steam and a condenser to condense exhaust steam into water. But I.C. engines require only a small tank to store fuel, and there is no steam condenser in it.
- I.C. engines are easy and quick to start and stop. Steam engines take time in the lighting of the fire and the generating the steam.
- I.C. engines are lighter and cheaper as compared to steam engines.