Do air conditioning can't afford not to know the flammable explosive four refrigerants

1, R32 refrigerant

R32 is also called methylene fluoride, fluoride carbon, colorless, tasteless, safe level for A2 level. R32 is a kind of thermodynamic performance of CFC substitutes, has a low boiling point and vapor pressure and the pressure is lower, the refrigeration coefficient is larger, the ozone loss value is zero, the greenhouse effect coefficient is small, flammable explosive, etc. In air combustion limit is 15% ~ 31%, in the fire will burn.

R32 has lower viscosity coefficient and high thermal conductivity. Although R32 advantage more, R32 is flammable explosive refrigerants, air conditioning installation and maintenance is dangerous work, now of uncertain factors, coupled with R32 safety issues to consider. Refrigeration equipment installation and welding R32 vacuum.

2, refrigerant R290

R290 ( Propane) , is a kind of new environmental protection refrigerants, mainly for the central air conditioning, heat pump air conditioner, air conditioning and other small household refrigeration equipment. R290 as a kind of hydrocarbon refrigerants, ODP value is 0, GWP value is less than 20, relatively common refrigerant has obvious environmental advantage, as shown in the following:

in addition, the refrigerant R290 has more latent heat of evaporation, good liquidity, energy saving, etc. However, due to the nature of the flammable explosive, perfusion has been curbed, security level for A3. Using R290 refrigerant level to vacuum, the flame, because air ( Oxygen) Mix can form explosive mixture, heat and flame is in danger of burning explosion.

3, R600a refrigerant

R600a isobutane, is a kind of excellent performance of the new type of hydrocarbon refrigerants, taken from the composition, no damage to the ozone layer, without the greenhouse effect, green environmental protection. Characterized by a large latent heat of evaporation and cooling ability; The flow performance is good, delivery pressure is low, low power consumption, load temperature picks up speed. Compatible with all kinds of compressor oil. Colorless gas at room temperature, under pressure from its own colorless transparent liquid, R600a is mainly used to replace R12 refrigerants, now used in household refrigerator equipment.

R600a refrigerant volume explosion limit of 1. 9% ~ 8. 4%, security levels for A3, mixed with air to form explosive mixture, with heat and flame is in danger of burning explosion, contact with oxidant violent reaction, the vapor is heavier than air, can spread in the low to very far place, fire will fire back to combustion.

4,汉尼( Ammonia) After the refrigerant

we R717 ( Ammonia) Relative to the above three kinds of refrigerants, ammonia refrigerating machine is more dangerous, it belongs to toxic medium, toxicity level 2.

ammonia belongs to the medium temperature refrigerants, pure ammonia had no adverse effect on oil, but there is water, can reduce the refrigeration oil lubrication, pipe and valve parts in ammonia refrigeration systems are not using the copper and copper alloy. Ammonia as a refrigerant advantage is: easy to obtain, low cost, moderate pressure, large unit refrigerating capacity, high coefficient of heat release, almost don't dissolve in oil, small flow resistance, leakage is easily found, does not destroy the ozone layer, without the greenhouse effect. The downside is: stimulating smell, toxic, can burn and explode, corrosion of copper and copper alloy.

when the ammonia vapor in the air volume reached 0. 5 - 0. 6% when can cause explosion. So the concentration of ammonia in air in the room may not be a zero. 02mg/L。 Room temperature ammonia is a flammable gas, explosion limit of 16% ~ 25%, easy ignition concentration was 17%, the explosion pressure when the concentration of 22. 5%.

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