All purpose low GWP Drop-in replacement for R22 in air conditioning & refrigeration
Compatible with mineral, alkyl benzene & polyol ester lubricants
All purpose, low GWP & zero ODP Drop-in replacement for R22, &compatible with all lubricants
All purpose, low GWP & zero ODP Drop-in replacement for R22, &compatible with all lubricants RS-70 is a new non-flammable Drop-inreplacement for R22 which has been designed to have the lowest possibleGlobal Warming Potential (GWP) consistent with high thermodynamicperformance having a similar cooling capacity & Coefficient ofPerformance (COP) as R22. Consequently, RS-70 can be used to replace R22in both air conditioning and refrigeration applications across thetemperature range where R22 is commonly used.
RS-70 is compatible both with the traditional mineral & alkylbenzeneoils, and also the polyol ester lubricants so that there is no need tochange the existing lubricant in the system when retrofitting to R22. Withits high technical performance, compatibility with all lubricants and lowGWP, RS-70 is an excellent choice to replace R22 as the end of R22approaches as mandated under the Montreal Protocol, the F Gas regulationin the European Union and other country based restrictions.
The GWP of RS-70 is lower than all other Drop-in replacements for R22available on the market including R438A, R417A, R422B, R422D, R417B, andothers. The GWP of RS-70 is also lower than R427A, R407A, R407F &R421A However, this has not been achieved by sacrificing performance sinceRS-70 is similar to R22 in terms of cooling capacity, COP, mass flow,compression ratio & discharge pressure while having a lower dischargetemperature. Accordingly, RS-70 is an excellent choice to replace R22 inthe majority of applications where R22 is found.
Performance Characteristics
- Lowest direct GWP Drop-in replacement for R22 on the market
- Similar energy efficiency to R22
- Close match for R22 in cooling capacity
- Similar discharge pressure to R22 & lower than R407C, R407A, R407F, R422D, R417B & R427A
- No changes to hardware required during retrofitting
- Compatible with MO, AB & POE lubricants
- Replaces R22 in air conditioning and refrigeration applications
- Similar flow rate to R22
- Application in systems with both fixed and variable expansion devices
- Lower discharge temperature than R22
- Zero Ozone Depletion Potential
- Non flammable & low toxicity
Low Global Warming Potential
The whole subject of global warming and climatic change has becomearguably one of the most important environmental issues of the day. Muchresearch has been conducted on an international basis culminating in therecent report of the Inter Governmental Panel on Climate change, whichconcludes that there is overwhelming evidence of warming of the planetcaused by man-made activities. Increasing quantities of carbon dioxide areconsidered as the prime cause of global warming taking place, and theAuthorities are increasingly minded to restrict the emissions of materialswith a GWP.
The recent IPCC report indicates that HFCs would contribute less than2% to global warming, far less than the effects of carbon dioxideemitted by fossil combustion and deforestation. HFC refrigerants under-pinpresent refrigeration and air-conditioning technologies giving customersan excellent combination of high efficiency with low hazard. Nevertheless,governments are minded to increasingly restrict HFC emissions byregulation and/or taxation, e.g. revision of the F Gas regulation in theEuropean Union in December 2013.
RS-70 has been specifically designed to mitigate these changes to therefrigerant user by reducing the direct GWP of the refrigerant while notcompromising its energy efficiency and technical properties as a suitableDrop-in replacement for R22.
Applications
RS-70 has similar energy efficiency, cooling capacity, mass flow rate,compression ratio & discharge pressure as R22. RS-70 is therefore asingle solution replacement for R22 across the range of applications whereR22 is commonly found.
Because the mass flow of RS-70 is similar to R22, RS-70 can be freely usedin systems both with a capillary, fixed orifice or variable expansiondevices.
RS-70 is compatible both with existing traditional lubricants, such asmineral & alkyl benzene oils, and also with polyol ester lubricants.
Applications for RS-70 include but are not restricted to air conditioning,commercial & industrial refrigeration, chillers, beer cellars, coldstores, refrigerated transport, supermarkets, appliances, dairy chillers,and others.
Lubricants
RS-70 is compatible with both the traditional & new syntheticlubricants so that there is no need to change the oil when converting fromR22 to RS-70. RS-70 is suitable for use with mineral, alkylbenzene andpolyol ester oils.
Safety
RRS-70 is non flammable as per ASHRAE Standard 34. The components of RS-70have been subjected to toxicity tests carried out by the AlternativeFluorocarbons Environmental Acceptability Study (AFEAS), and have beendeclared to be of low toxicity. RS-70 has been assigned a refrigerantnumber of R453A by the ASHRAE with a safety classification of A1, namelylow toxicity & flammable under all conditions of flammability.
Servicing
Because RS-70 is a blend, it should be charged into the system in theliquid as opposed to vapour form. There is no need to make any hardwarechanges when converting from R22 to RS-70 and can be used with expansiondevices having a fixed orifice or adjustable setting.
Physical Properties
| Property | RS-70 (2) | R22 | |
|---|---|---|---|
| Molecular weight | 88.8 | 86.5 | |
| Boiling point (1 atm) (1) | °C | -42.2 | -40.8 |
| °F | -44.0 | -41.5 | |
| Temperature Glide (4) | K | 4.2 | 0.0 |
| Critical Temperature | °C | 88.8 | 96.1 |
| °F | 191.8 | 205.1 | |
| Critical Pressure | bara | 45.3 | 49.90 |
| psia | 656.5 | 724 | |
| Liquid Density (25°C) (1) | kg/m3 | 1136 | 1191 |
| Density of saturated vapour (25°C) (1) | kg/m3 | 41.69 | 44.23 |
| Latent Heat of Vaporisation at boiling point (3) | kJ/kg | 243.3 | 233.8 |
| Heat capacity constant volume Cv (25°C & 1bara) | kJ/kg.K | 0.7458 | 0.5587 |
| Heat capacity constant pressure Cp (25°C & 1bara) | kJ/kg.K | 0.845 | 0.6619 |
| Cp/Cv (25°C & 1 bara) | 1.137 | 1.185 | |
| Vapour Pressure (25°C) (1) | bara | 11.53 | 10.439 |
| psia | 167.2 | 151.4 | |
| Vapour Viscosity (25°C & 1 bara) | cP | 0.0122 | 0.0126 |
| Liquid Viscosity (25°C) (1) | cP | 0.1572 | 0.164 |
| Liquid Thermal Conductivity (25°C) | W/m.K | 0.0833 | 0.0835 |
| Surface Tension (25°C) (1) | N/m | 0.0072 | 0.00808 |
| Specific heat of liquid (25°C) (1) | kJ/kg.K | 1.5209 | 1.2568 |
| Ozone Depletion Potential | ODP | 0 | 0.06 |
| Flammability limit in air (1 atm) | vol% | none | none |
| Inhalation exposure (8 hour day & 40 hour week) | ppm | 1000 | 1000 |
| GWP AR4 | 1765 | 1810 |
(1) Bubble point
(2) RS-70 refrigerant properties obtained from NIST's REFPROP program.
(3) Difference between bubble point liquid enthalpy and dew point vapour enthalpy at 1 atm.
(4) Evaporator temperature glide calculated using NIST CYCLE D in accordance with high evaporating condition specified inStandard EN 12900:2005 Section 7 Table 2 assuming 100% compressor and motor efficiencies.
