What is the difference between the refrigerant R134a and R600a in the refrigerator?

R134a (tetrafluoroethane) is not good for refrigeration systems because of its high water solubility. Even if there is a small amount of water, under the action of lubricating oil, it will produce acid, carbon dioxide or carbon monoxide, which will produce metal Corrosion, so R134a requires higher drying and cleaning of the system. R600a (isobutane) is slightly soluble in water and has good compatibility with most metals such as carbon steel, stainless steel, copper and aluminum.

R134a has very low toxicity and is non-flammable in the air. The safety category is A1. It is a very safe refrigerant.

R600a has weak irritation and anesthesia. It is a flammable gas. It can form a BaoZa mixture when mixed with air. It may burn BaoZa in case of heat and open flames. It reacts violently on contact with oxidants. Its vapor is heavier than air and can spread to a relatively far place at a lower level, and will ignite when it encounters a fire source. R134 has a certain greenhouse effect. R600a has no greenhouse effect.

R600a has lower evaporation pressure, condensing pressure, and exhaust temperature than R-134a. The lower liquid density of R600a refrigerant makes the charge volume 45 of R-134a. %, the refrigeration performance is good, the refrigeration capacity is 55% of R-134a; R600a refrigerant has a strong destructive effect on the ozone layer due to R11 and R12, and the greenhouse effect is obvious. Among the alternative routes of CFCS, one is based on the United States and Japan. The alternative route using R134a refrigerant is the representative one; the other is the alternative route using hydrocarbons as the refrigerant, which is represented by Germany.

In the early days, the Chinese refrigerator industry focused its attention and energy on the alternative route of R134a refrigerant. R134a refrigerant and mineral lubricating oil are not compatible with each other, and the cleanliness control requirements of the production process and refrigeration system components are too strict. The energy consumption of refrigerators has also increased after using R134a refrigerant. At the same time, the refrigerant still has a certain greenhouse. The effect is not the optimal refrigerant alternative route.

The advantages of typical hydrocarbon refrigerants such as isobutane (R600a) just overcome the shortcomings of R134a refrigerant. The excellent thermophysical properties of R600a determine the refrigerant It has higher energy efficiency than CFCS and HFCS. The efficiency of the compressor (COP value) and the refrigeration efficiency of the refrigerator (power consumption index) are both higher than that of R134a. Because of the advantages of energy saving and environmental pollution, Germany first successfully used hydrocarbons as refrigerants in refrigerators. With the maturity of process and technology, R600a refrigerant has also been widely used in China's refrigeration industry.

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