3.2.6 Freon group
- They are fluorocarbons of methane and ethane series.
- They contain 1 or more of these halogens (chlorine, bromine, fluorine)
- Non toxic, non-flammable, non-explosive, non- corrosive, non-irritant to human body and eyes.
- Odourless, colourless
- Will not react with food product stored in the refrigerated space.
- Will not react with lubricating oil.
- Has excellent thermodynamic properties
- Only disadvantage is ozone layer is damaged.
FREON 11 (Trichloro monofluro methane – CCl3F)
- Has the boiling point of 74.8ºF.
- Used in air conditioning plants in a larger level factories, theatres
FREON 12 (Dichloro-difluro methane –CCl2F2)
- Mostly used in domestic and commercial refrigeraters (in ice cream cabinets, display cabinets, deep freezer)
- It is very widely used, colourless gas with mild odour
- Heavier than air
- Does not dissolve in water, moisture content should not exceed 0.0025% by weight
- It does not react with metals like ferrous, aluminium, phosphor bronze
- It attacks copper, copper alloys, zinc and bronze and dissolves in water
- It does not react with lubricating oils in the absence of moisture, but oxidizes them in the presence of water vapour
FREON 13 (Mono chloro-trifluromethane) (CCl F3)
- Widely used
- Somewhat inferior in thermodynamic properties
- FREON 21 – (dichloro - monofluoroethane) (CHCl2F)
- FREON 22 – (monochloro – diflueroethane) (CHClF2)
- There are used in small refrigeration plants
- Used to obtain moderately low temperature (-50ºC)
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Last modified: Saturday, 24 December 2011, 11:08 AM