air compressor

 reciprocating air compressor

air compressor is a machine in which year interest at low pressure and it is compressed due to reciprocating action of Pistol this compressor air is at high pressure which is delivered to the tool in which this is used

applications of compressed air in coal mines all the tools are used phonetic tools example phonetic drill Kinetic hammer phonetic phonetic pick up Kolkata city see the electric motors or IC engines are not used in coal mines due to danger of Fire it is used for supercharging of IC engine or spray painting for inflation of tyres in blast furnace compressed air supply in brakes of automobiles for conveying material like powdered core sand or concrete through pipeline in manufacturing various chemicals example in manufacturing of synthetic NH3 very high pressure air is used

from the above PV diagram it is clearly observed that if compression is carried out by isothermal process then the the work done required is minimum compared to polytropic or adiabatic compression so the best value of index of compression is N is equal to 1 and isothermal compression is the best process for compressor which required minimum work input isothermal compression is very difficult to achieve in practical is isothermal process are required to perform at very slow speed that is speed of compressor must be keep very low or very slow which would be required more time for compression show the following practical methods are used to actually isothermal compression for high speed compressor the main object of all the methods is reduce the final temperature T2 during compression during compression so that actual work approaches more closely to the isothermal compression injection

spray injection water jacketing intercooling external fans isothermal efficiency it is measure of degree to which isothermal compression is achieved it is ratio of isothermal work input to actual work output higher the isothermal efficiency more closer to the isothermal compression