Download 4O LESSONS ON REFRIGERATION AND AIR CONDITIONING FROM IIT by EE IIT, Kharagpur, India PDF

By EE IIT, Kharagpur, India

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A hermetic or sealed compressor was the outcome of this. 11 Version 1 ME, IIT Kharagpur An Australian Douglas Henry Stokes made the first sealed or hermetic compressor in 1918. Hermetic compressors soon became extremely popular, and the rapid development of small hermetic compressors has paved the way for taking the refrigeration systems to the households. With the capacitor starting of the electric motor becoming common in 1930s, the design of hermetic compressors was perfected. In 1926, General Electric Co.

After 1940 the 4-pole motors were replaced by 2-pole motors, which reduced of the compressor unit significantly. Soon the 2-pole hermetic refrigerant compressor became universal. Gradually, the capacity of hermetic compressors was increased. Now-a days hermetic compressors are available for refrigerating capacities starting from a few Watts to kilowatts. At present, due to higher efficiency and serviceability, the open type compressors are used in medium to large capacity systems, whereas the hermetic compressors are exclusively used in small capacity systems on a mass production.

6. 5. 3. Dynamic type: Centrifugal compressors (also known as turbocompressors) belong to the class of dynamic type of compressors, in which the pressure rise takes place due to the exchange of angular momentum between the rotating blades and the vapour trapped in between the blades. Centrifugal were initially used for compressing air. The development of these compressors is largely due to the efforts of Auguste Rateau of France from 1890. In 1899, Rateau developed single impeller (rotor) and later multi-impeller fans.

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