1, 12
industrial ice machine R12 refrigerants is widely used in the past, but it has serious damage of atmospheric ozone layer, and produce the greenhouse effect, endanger human survival environment, developed countries have banned use, developing countries will completely stop using and production.
R12 under a standard atmospheric pressure boiling point for -
29.
8, freezing point to -
155, can be used to obtain -
Low temperature of 70 degrees.
Colorless, smell is very weak, small toxicity, no combustion, no explosion, but when the temperature to 400 degrees above, and in case of fire will decompose toxic phosgene.
In a general refrigeration system, its working pressure is moderate.
Water as cooling medium, the condensing pressure in 1.
Below 0 mp.
2, R22 refrigerant R22 has slight damage to atmospheric ozone layer, and produce the greenhouse effect.
The boiling point of R22 in a standard pressure for -
40.
8, freezing point to -
160.
Colorless, smell is very weak, small toxicity, no combustion, no explosion.
Water as cooling medium, the condensing pressure in 1.
53 mp.
3, refrigerant R134a has a main under a standard atmospheric pressure boiling point for -
26.
5, freezing point to -
101.
Colorless, smell is very weak, small toxicity, no combustion, no explosion.
The atmosphere without damage, but there are still certain greenhouse effect.
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