Mixed refrigerants will challenge the cooling efficiency of R600a and R290

Recently, researchers have confirmed that many refrigerant mixtures in small refrigeration systems are more efficient than pure hydrocarbons.

At present, isobutane (R600a) has replaced R134a as the main refrigerant for household refrigerators/freezers, and propane (R290) has become the first choice for environmental protection of independent commercial refrigeration equipment. Especially in Europe, the F-gas regulation (517/2014) prohibits the use of refrigerants with a GWP (Global Warming Potential) value greater than 150 in small-capacity refrigeration systems.

In addition to extremely low GWP values, hydrocarbon refrigerants are also known for their low energy efficiency. Although these gases meet the requirements of all environmental regulations, so far there are relatively few studies to improve the performance of these refrigerants. According to statistics, more than 1.5 billion hydrocarbon refrigerators in the world account for about 2.6% of global electricity consumption. Scientists from the University of Haimen I in Spain have now discovered that adding a small amount of refrigerant to form a mixture can theoretically provide a more energy-efficient choice for R600a and R290. The team studied 110,880 refrigerant mixtures and performed thermodynamic evaluations of R600a and R290 refrigerants. The refrigerants used for blending in this study are R290 (propane), R600a (isobutane), R600 (butane), R1270 (propylene), R152a, R32, R1234yf, R1234ze (E), R1233zd and R744 (carbon dioxide). ), and the experiment only considered blends containing up to three components. The maximum GWP value of any potential blended refrigerant is set to 150, and the maximum effective slip allowed in the evaporator is 10K. The researchers insist that it is clear that certain refrigerant mixtures may slightly increase the COP (coefficient of refrigeration) compared to pure hydrocarbons in small systems. However, they acknowledged the need for experimental verification to confirm the true possibility of the identified mixture.

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