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Note for Refrigeration and Air Conditioning - RAC By Akhil Nair

  • Refrigeration and Air Conditioning - RAC
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Note for Refrigeration and Air Conditioning - RAC By Akhil Nair

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Refrigeration and air conditioning 2 History of refrigeration 3 unit of refrigeration 4 open air refrigeration cycle 6 closed or dense air refrigeration cycle 7 air refrigerator working or reversed carnot cycle 8 reversed carnot cycle 9 limitation of reversed carnot cycle 12 bell-coleman cycle 15 simple air cooling system 16 boot strap air cooling system 18 steam jet refrigeration 20 Thermoelectric refrigeration 24 Thermoelectric Effect 25 Thermoelectric Refrigeration 28 Adiabatic Demagnetisation 29 Vertex tubeRefrigeration 32 vapour compression refrigeration system 36 vapour compression cycle 39 factors affecting C.O.P of vapour compression system 42 vapour compression system liquid vapour regenerative heat exchanger 46 actual vapour compression cycle 48 multi pressure system 51 multistage compression 52 multistage compression with flash gas removal 53 multistage compression with flash intercooling 55 multistage compression system with flash gas removal and flash intecooling 57 multi evaporator system 58 simple vapour absorption system 59 Electrolux refrigerator 65 Lithium bromide absorption refrigeration system 68 air conditioning 74 psy chrometric properties 77 psychrometric chart 81 adiabatic mixing of air streams 84 sensible heating 87 cooling and humidification 94 room sensible heat factor 99 grand sensible heat factor 102 comfort chart 108 room air conditioner 112 split air conditioner 114 packaged system 118 all water system 123 summer air conditioning system 125 winter air conditioning ystem 127 year round air conditioning system 131 load estimation 132 cooling load estimation 133 heating load estimation 136 solar radiation 137 solar heat gain through glass 138 infiltration 140

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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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