ENERGY SAVING
Simple solutions improve performance
A low-GWP refrigerant is not the only factor that aff ects a system’s energy effi ciency – replacing the system’s refrigeration oil is also benefi cial according to Climalife.
I
mproving the performance of refrigeration systems by simply changing the lubricant
A low-GWP refrigerant is not the only factor that aff ects a system’s
energy effi ciency; replacing the system’s refrigeration oil is also benefi cial as this article from Climalife explains.
When replacing a system’s refrigeration oil, two characteristics have to be taken into account: the compatibility of the refrigerant/oil and maintaining or improving the system’s performance. Esso SAF works on this challenge on a daily basis with Climalife and other refrigeration professionals. In this article we examine two procedures that are representative of the food production industry.
The fi rst is the procedure for converting a subcritical or transcritical CO2 installation (R744) with POE oil to a new technology POE oil, Mobil SHC Gargoyle 80 POE. This aims to save energy.
The challenge posed by this type of system is to ensure optimal lubrication in hot and cold conditions. For highly soluble refrigerants, such as R744
28 January 2020
or R1234ze, Mobil has developed an advanced technology polyolester oil, Mobil SHC Gargoyle Arctic 80 POE, which has a higher viscosity index than conventional POEs to ensure optimal lubrication and a low traction coeffi cient (friction of molecules together), which is synonymous with a possible reduction in energy use. The fi rst stage of the conversion procedure is to check that the system’s current oil and the new Mobil oil are compatible on a physical-chemical level. The second procedure is for converting an ammonia-based system running on napthenic or paraffi nic mineral oils to Mobil Gargoyle Arctic SHC NH 68 synthetic oil. This aims to improve the performance of the evaporators. Ammonia is a refrigerant that is commonly used in the food production industry. Historically, a large number of compressors contained mineral oil but a growing number use synthetic oils that perform better at a lower temperature as the oil is no longer trapped in the evaporators and can return easily to the compressor.
In addition, the thermal stability and oxidation resistance of synthetic oils
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