What is a desirable property of ammonia refrigerant oil?

A desirable property of ammonia refrigerant oil is being free of water. Water contamination in refrigerant oil can lead to various problems, including reduced lubricant effectiveness, corrosion in components, and the formation of sludge. Ammonia is hygroscopic, meaning it can absorb moisture, which can compromise the efficiency of the refrigeration system. Ensuring that the oil is free of water helps maintain optimal performance and extends the life of the equipment.

The other properties mentioned do not align with the characteristics needed for effective ammonia refrigerant oil. For instance, high paraffin content would generally not be desired as it can affect the oil’s properties and operational stability. A very low flashpoint is also undesirable as it raises safety concerns; substances with low flashpoints are more prone to ignite under normal operational conditions, which poses risks. Hence, the focus on maintaining the oil free of water is critical for safety and efficiency in refrigeration systems using ammonia.