By EE IIT, Kharagpur, India
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Additional info for 4O LESSONS ON REFRIGERATION AND AIR CONDITIONING FROM IIT KHARAGPUR. USEFUL TRAINING MATERIAL FOR MECHANICAL ENGINEERING STUDENTS COLLEGE, OR AS REFERENCE FOR ENGINEER
This fact gave rise to the idea of sealed or hermetic compressor (both compressor and motor are mounted in the same enclosure). However, since the early electric motors with brushes and commutator and primitive insulation delayed the realization of hermetic compressors upto the end of First World War. As mentioned, the earliest compressors were hand operated. Later they were driven by steam engines. However, the steam engines gradually gave way to electric motors. Diesel and petrol engine driven compressors were developed much later.
The single screw type compressor was first made for air in 1967. Grasso, Netherlands introduced single screw refrigerant compressors in 1974. The screw compressor (both single and twin screw) became popular since 1960 and its design has almost been perfected. Presently it is made for medium to large capacity range for ammonia and fluorocarbon based refrigerants. It competes with the reciprocating compressors at the lower capacity range and on the higher capacity side it competes with the centrifugal compressor.
Now-a-days refrigeration has become an essential part of food chain- from post harvest heat removal to processing, distribution and storage. Refrigeration has become essential for many chemical and processing industries to improve the standard, quality, precision and efficiency of many manufacturing processes. Ever-new applications of refrigeration arise all the time. Some special applications require small capacities but are technically intriguing and challenging. As mentioned before, air-conditioning is one of the major applications of refrigeration.
4O LESSONS ON REFRIGERATION AND AIR CONDITIONING FROM IIT KHARAGPUR. USEFUL TRAINING MATERIAL FOR MECHANICAL ENGINEERING STUDENTS COLLEGE, OR AS REFERENCE FOR ENGINEER by EE IIT, Kharagpur, India