RS-50 has a Global Warming Potential (GWP) of less than one half of R404A together with a higher efficiency which delivers energy savings and a lower contribution to global warming.
RS-50 can be used to replace R404A in both new & existing equipment. Mass flow of RS-50 is lower than R404A so that reducing the opening of the expansion device may be required. No changes to other hardware are necessary. A significant increase in energy efficiency compared to R404A and R507 can be expected. Users will achieve a lower carbon footprint due to the lower direct GWP of the refrigerant & its inherent higher efficiency.
RS-50 is a non ozone depleting and non flammable replacement for R22 in medium and low temperature refrigeration applications. The efficiency and cooling capacity of RS-50 provide a close match for R22 in overall system performance. Flow rate is identical to R22 which avoids the need to change or alter existing pipework.
Because the properties of RS-50 are similar to R404A & R507, it is suitable for use in many of the applications where R404A & R507 are commonly found including supermarket display cases, cold stores, freezers, refrigerated transport, ice machines, cold storage, transportation of foodstuffs, freezer cabinets, beer cellars, freeze dryers & environmental test chambers.
R22 is also used in many of these refrigeration applications where RS-50 can be a suitable replacement.
RS-50 is compatible with the same (POE) lubricants which are commonly used with R404A & R507 so that there is no need to change the oil when converting from R404A & R507 to RS-50. When replacing R22 with RS-50, the lubricant should be changed to a polyol ester oil.
RS-50 is non flammable under all conditions of fractionation as per ASHRAE Standard 34. The components of RS-50 have been subjected to toxicity tests carried out by Alternative Fluorocarbons Environmental Acceptability Study (AFEAS), and have been declared to be of low toxicity. RS-50 has been designated a refrigerant number of R442A by the ASHRAE with a safety classification of A1.
Because RS-50 is a blend, it should be charged into the system in the liquid as opposed to vapour form. There is no need to make hardware changes when converting from R404A & R507 to RS-50 other than reducing the opening of the expansion device. Because RS-50 has a similar flow rate to R22, there is not need to adjust or change the expansion device during a retrofit.
|Boiling point (1 atm)||°C||-46.5(1)||-46.2(1)||-40.8(1)|
|Liquid Density (25°C)||kg/m3||1108||1044||1191|
|Density of saturated vapour (25°C)||kg/m3||47.7||65.3||44.2|
|Latent Heat of Vaporisation at boiling point||kJ/kg||266(1)||200(1)||234|
|Cv (25°C & 1bara)||kJ/kg.K||0.727||0.784||0.559|
|Cp (25°C & 1bara)||kJ/kg.K||0.838||0.877||0.662|
|Cp/Cv (25°C & 1 bara)||1.152||1.118||1.185|
|Vapour Pressure (25°C)||bara||13.3(1)||12.6(1)||10.4|
|Vapour Viscosity (25°C & 1 bara)||cP||0.0126||0.0120||0.0126|
|Liquid Viscosity (25°C)||cP||0.141||0.128||0.164|
|Liquid Thermal Conductivity (25°C)||W/m.K||0.0857||0.0636||0.0835|
|Surface Tension (25°C)||N/m||0.00661||0.00455||0.00808|
|Specific heat of liquid (25°C)||kJ/kg.K||1.58||1.54||1.26|
|Ozone Depletion Potential||ODP||0||0||0.055|
|Flammability limit in air (1 atm)||vol%||none||none||none|
|Inhalation exposure (8 hour day & 40 hour week)||ppm||1000||1000||1000|
(1) Bubble point