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

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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

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However, a practical 12 Version 1 ME, IIT Kharagpur positive displacement, rotary vane compressor could only be developed in 1920. Stamp made an ethyl chloride compressor of 1000 kcal/h capacity. In USA, Sunbeam Electric made small sulphur dioxide based rotary sliding vane compressors of 150 kcal/h capacity, rotating at 1750 rpm for domestic refrigerators. In 1922, Sulzer, Switzerland made “Frigorotor” of 1000 to 10000 kcal/h using methyl chloride. Sulzer later extended this design to ammonia for large capacities (“Frigocentrale”).

Ethyl ether was the first refrigerant to be used commercially, because: a) It exists as liquid at ambient conditions b) It is safe c) It is inexpensive d) All of the above Ans. a) Q. Ammonia is one of the oldest refrigerants, which is still used widely, because: a) It offers excellent performance b) It is a natural refrigerant c) It is inexpensive d) All of the above Ans. d) Q. In the olden days Carbon dioxide was commonly used in marine applications as: a) It has low critical temperature b) Its operating pressures are high c) It is non-toxic and non-flammable d) It is odorless Ans.

Special Applications 4. 2. 1. Storage of Raw Fruits and Vegetables: It is well-known that some bacteria are responsible for degradation of food, and enzymatic processing cause ripening of the fruits and vegetables. The growth of bacteria and the rate of enzymatic processes are reduced at low temperature. This helps in reducing the spoilage and improving the shelf life of the food. 1 shows useful storage life of some plant and animal tissues at various 3 Version 1 ME, IIT Kharagpur temperatures.

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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


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