What problem can excessive circulation of lubricating oil with refrigerant lead to?

Excessive circulation of lubricating oil with refrigerant can indeed lead to oil accumulation in the evaporator. The primary role of oil in a refrigeration system is to lubricate moving parts, such as the compressor. However, when too much oil is present, it can mix with the refrigerant and travel throughout the system.

In the evaporator, the refrigerant absorbs heat and changes from a liquid to a gas. If there is an excessive amount of oil in the evaporator, it can hinder the refrigerant's ability to absorb heat efficiently. This can lead to poor heat transfer, reducing the overall effectiveness of the evaporator and causing issues such as reduced cooling capacity and inefficient operation. Over time, this accumulation of oil can lead to other complications, such as blockages or even compressor failure if the lubrication becomes insufficient.

On the other hand, while decreased compressor efficiency could be a result of various factors, it is not a direct consequence of excessive oil circulation. Increased air flow typically relates to the fan or airflow system and is not directly impacted by oil movement. Freezing of condenser coils usually concerns temperature control and refrigerant behavior, rather than oil circulation patterns. Thus, oil accumulation in the evaporator is the most accurate consequence of excessive lubricating