What does an increase in molecular weight of refrigerant compared to oil lead to?

An increase in molecular weight of refrigerant compared to oil can lead to more refrigerant leaks due to the physical properties associated with heavier molecules. Heavier refrigerants tend to have higher pressures and lower diffusivity compared to lighter ones. This can affect how the refrigerant interacts with seals and gaskets within the system.

With increased molecular weight, the likelihood of refrigerant not being able to escape through microscopic openings increases, which could lead to pressure differentials that might force the refrigerant to find ways to leak, particularly as systems age and components wear.

This outcome is significant in refrigeration and air conditioning systems, where maintaining the correct refrigerant charge is vital for efficient operation. Understanding the implications of refrigerant molecular weight on system integrity is crucial for technicians when selecting refrigerants for specific applications.