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Note for Refrigeration and Air Conditioning - RAC By Akhil Nair

  • Refrigeration and Air Conditioning - RAC
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Akhil Nair
Akhil Nair
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MODULE I

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Refrigeration and Air Conditioning Refrigeration  The process of removing heat from a substance under controlled conditions  Process of reducing and maintaining the temperature of a body below the general temperature of it’s surroundings Air Conditioning • Supplying and maintaining desirable internal atmospheric condition for human comfort, irrespective of external conditions

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HISTORY OF REFRIGERATION  William Coolen - 1748- Produced refrigeration by creating partial vacuum over ethyl ether  Perkins – 1834 – Hand operated compressor machine working on ether  Gorrie – 1851 – Air refrigeration machine  Linde – 1856 - Refrigeration machine working on Ammonia  Du Pont – 1920 – Fluoro- Chloro derivatives of methane, ethane, etc.- popularly known as Chloro Fluoro Carbons (CFCs)- Freons  Peltier Effect - 1934

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UNIT OF REFRIGERATION ■ The practical unit of refrigeration is expressed in terms of ‘tonne of refrigeration’ (briefly written as TR) ■ One tonne of refrigeration is defined as the amount of refrigeration effect produced by the uniform melting of one tonne of ice from and at 0̊ C in 24 hours ■ Latent heat of ice = 335 kJ/kg ■ 1 TR = 1000 × 335 in 24 hours = 1000×335 24×60 = 232.6 kJ/min = 3.88 kW  In actual practice, one tonne of refrigeration is taken as equivalent to 210 kJ/min or 3.5 kW

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