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Properties and Difference of Refrigerant Gas R134a and R600a in Fridge Refrigeration

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Properties and Difference of Refrigerant Gas R134a and R600a in Fridge Refrigeration

What is the difference between 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, it will produce acid, carbon dioxide or carbon monoxide under the action of lubricating oil, which will cause corrosion to metals. Therefore, 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, which is a very safe refrigerant.

R600a has weak irritant and anesthetic effects. It is a flammable gas. It can form a explosive mixture when mixed with air. It may burn and explode in case of heat and open flames. Violent reaction with oxidant. Its vapor is heavier than air and can spread to a considerable distance in a lower place, and will ignite when it encounters a fire source.

R134 has a certain greenhouse effect.

R600a has no greenhouse effect.

The evaporating pressure, condensing pressure, and exhaust temperature of R600a are all lower than R-134a. The lower liquid density of R600a refrigerant makes its charging capacity 45% of R-134a. It has good refrigeration performance and its refrigeration capacity is 55% of R-134a.

Because R11 and R12 have a strong destructive effect on the ozone layer, and the greenhouse effect is obvious, among the CFCS alternative routes, one is the alternative route using R134a refrigerant represented by the United States and Japan; the other is represented by Germany to use hydrocarbons as an alternative route for refrigerants.

China's refrigerator industry focused its attention and energy on the alternative route of R134a refrigerant in the early days. 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, and 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 that the refrigerant has higher energy efficiency and compressor efficiency than CFCS and HFCS. (COP value) and the refrigerator's overall cooling efficiency (power consumption index) are higher than R134a. Because of the advantages of energy saving and environmental pollution, Germany first successfully used hydrocarbons as refrigerants in refrigerators. With the maturity of the process and technology, R600a refrigerant has also been widely used in China's refrigeration industry.




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