The refrigerant for DC/AC refrigerator

The refrigerant of DC/AC refrigerator is an important part of the refrigeration system and directly affects the refrigeration performance of the entire refrigerator.
Selection Criteria: Refrigerant selection is a critical engineering decision that requires consideration of multiple factors. First of all, the refrigerant must have good refrigeration properties, including thermal conductivity, latent heat of phase change, gas phase density, etc. Secondly, the refrigerant must have an appropriate pressure and temperature range in the refrigeration cycle to ensure efficient operation under different working conditions. At the same time, for environmental considerations, modern refrigerants are often required to have low global warming potential (GWP) and zero ozone depletion potential (ODP).
Common refrigerants: In the past, Freon compounds were common refrigerants, such as R-12 and R-22. However, due to the destruction of the ozone layer and contribution of these substances to global warming, the international community is gradually adopting more environmentally friendly refrigerants. Some common modern refrigerants include the hydrofluorocarbons (HFCs) series, such as R-134a, R-410a, and the hydrofluorocarbons (HFOs) series, such as R-1234yf. These new refrigerants may offer superior performance while having a lower impact on the environment.
Performance characteristics: The performance characteristics of the refrigerant are directly related to the efficiency of the refrigeration system. The heat conduction performance of the refrigerant determines its cooling effect in the evaporator and condenser, while the latent heat of phase change represents the heat absorbed or released by unit mass of the refrigerant during the phase change process. These two factors jointly affect the refrigeration efficiency of the entire refrigeration system.
Trend of new refrigerants: With the emphasis on environmental protection, the development and application of new refrigerants has gradually become a trend in the field of refrigeration technology. For example, the hydrofluorocarbon (HFOs) family of refrigerants has lower global warming potential and is considered an environmentally friendly alternative. In addition, natural refrigerants such as ammonia (NH3) and carbon dioxide gas (CO2) have also attracted attention due to their environmentally friendly and zero ODP characteristics.
Lubricating oil compatibility: Refrigerant selection also needs to consider its compatibility with the lubricating oil in the refrigeration system. Different refrigerants may require specific types of lubricants to ensure the system operates properly and does not damage internal components.