What are the flammable and explosive refrigerants? Let’s take a look at Refrigerants.com! Be vigilant when using these four refrigerants!
Difluoromethane R-32 is the abbreviation of difluoromethane. R32 is colorless, odorless, and slightly flammable (A2 level). The flammability limit in the air is 14%~31%. It will burn and explode when exposed to open flame. R32 refrigerant is easily soluble in oil but hardly soluble in water. The ozone-depleting potential value ODP is 0, and the global warming coefficient value GWP is 670. The pressure is about 60% higher than R22. Products need to withstand high pressure, and tools and equipment used for maintenance also need to withstand high pressure. The pressure is equivalent to R410A, and the thermal performance of R32 is very close to that of R410A.
In addition, R32 also has a low viscosity coefficient and a high thermal conductivity. Although R32 has many advantages, R32 is a flammable and explosive refrigerant; the installation and maintenance of air conditioners is inherently dangerous work, and now coupled with the uncertain factors of R32, safety issues have to be considered.
Need to pay attention! R32 refrigerant needs to be vacuumed, and open flames need to be banned!
R290 (propane), also known as cold coal, is a new type of environmentally friendly refrigerant, mainly used in central air conditioners, heat pump air conditioners, household air conditioners, and other small refrigeration equipment. As a hydrocarbon refrigerant, R290 has an ODP value of 0 and a GWP value of less than 20. Compared with R600a, R134a & R404A, it has outstanding advantages in refrigeration performance. Due to its flammable and explosive characteristics, the filling volume is limited, and the safety level is A3.
Attention! R290 needs to be evacuated, and the mixture of air can form an explosive mixture. There is a danger of combustion and explosion when it encounters a heat source or an open flame. Open flames must be prohibited!
R600a, isobutane, is a new type of hydrocarbon refrigerant with excellent performance. It is derived from natural ingredients, does not damage the ozone layer, has no greenhouse effect, and is environmentally friendly. It is characterized by the large latent heat of evaporation and strong cooling capacity; good flow performance, low delivery pressure, low power consumption, and the slow recovery of load temperature. Compatible with various compressor lubricants. It is a colorless gas at normal temperatures and a colorless transparent liquid under its pressure. R600a is mainly used to replace R12 refrigerant and is now mostly used in household refrigerators.
R600a is also a flammable gas, which can form an explosive mixture when mixed with air, and there is a danger of combustion and explosion when it meets a heat source or an open flame. Reacts violently with oxidizing agents. Its vapor is heavier than air and can spread to a considerable distance at a lower place, and it will ignite and burn back when encountering an ignition source.
Note: When the content of R600a in the refrigeration system is insufficient, the pressure value will be too high, the sound of the machine will be abnormal, and the life of the compressor will be shortened.
R717 (ammonia) refrigerant, ammonia is a medium-temperature refrigerant, and pure ammonia has no adverse effect on lubricating oil, but when there is moisture, it will reduce the lubrication of the refrigeration oil. In the ammonia refrigeration system, copper and copper are not used for pipes and valves. copper alloy. R717 (ammonia) has a mature synthesis process, easy preparation, low price, does not destroy the ozone layer, and has no greenhouse effect. The cooling capacity per unit volume is larger than that of R22; the latent heat of vaporization is large, and the cooling and heat release coefficients are high. Ammonia refrigerants are widely used in large-scale cold storage and supermarket food display cabinets.
Ammonia vapor is colorless and has a strong pungent odor. Ammonia is highly toxic to the human body, and it can cause frostbite when it splashes on the skin.
When the volume of ammonia vapor in the air reaches 0.5-0.6%, it can cause an explosion. Therefore, the concentration of ammonia in the air in the computer room shall not exceed 0.02mg/L. Ammonia is not easy to burn at room temperature, but when heated to 350°C, it decomposes into nitrogen and hydrogen, and the hydrogen will explode when mixed with oxygen in the air.