New Replacement for R22

[Merganser9]

Recently heard of a new (to me) replacement refrigerant for R22 possibly for use in marine apps. The stuff is calls RS45 one of a few "RS" series replacements which are supposed to be drop in replacements. Any word on use and acceptance of this series of replacements?

[BOCman]

Details on the RS products on this UK site
http://www.gas2010.com/retrofit-hfcs#rsseries

or the manufacturers site http://www.refsols.com/

[jsp]

Recently heard of a new (to me) replacement refrigerant for R22 possibly for use in marine apps. The stuff is calls RS45 one of a few "RS" series replacements which are supposed to be drop in replacements. Any word on use and acceptance of this series of replacements?

Recently used RS45 on a 300kW packaged water chiller, copeland d8sj 6000 and a shell and tube evaporator.

The results were not great, suffered heavily with oil sitting in the evaporator and liquid lines, resulting in a very low capacity, roughly 60% compared to the other circuit! Low current draw and poor control of superheat . had to revert back to reclaimed R22 for a quick fix.

After looking into this further, next time going to convert oil to POE and fingers crossed hope it works!
The drop ins are not miscible with the 22, so require POE to work on systems without oil seperators or low points in the suction to cause oil trapping.

[Fri3Oil System]

Agree with JSP.
The "drop ins" are blends of:
HFC: 97% approx.
HC: 3% approx.
HFC's are not miscible/solluble with MO... If we believe that a 3% of HC (R600a) is not enough, since the oil will remain in all the traps it founds in the circuit.
Besides, there is a significant drop of the cooling capacity and COP.
I managed to upload the case study on my website, so now it's available for everybody:
http://www.fri3oilsystem.com/retrofitcase.zip
In this case, you will see how it is possible to improve the installation conditions (CAP+COP) by cleaning the circuit. You can recover partially the installation original performance, between 8-12%. So, if you switch to a HFC (407C or 404A) you obtain a better performance than with the R22.

Regards,

Nando

[skoerper]

R407A is a proven replacement in exsiting R22 low and med temp refrigeration equipment. No equipment changes or mods. Does require at least 50% POE.
Copeland, Carlyle and Bitzer approved.
Walmart, Food Lion, Costco, and many others are using it in new equipment since it has a low GWP compared to R507 and R404a.