https://www.coolingpost.com/world-news/honeywell-announces-new-alternative-to-r134a-refrigerant/
[By comparison, R134a - the common refrigerant today for air
conditioners, heat pumps, refrigerators and freezers - is 1300.
List of refrigerants showing ozone depletion potential and global
warming potential:
https://www.engineeringtoolbox.com/Refrigerants-Environment-Properties-d_1220.html
That makes R134a 4 to 5 times worse than the number claimed for this new
refrigerant - R515B.
The Drawdown.org initiative puts refrigerants as their number 1 action
item out of the 100 they chose to work on.]
Honeywell announces new alternative to R134a refrigerant
4 Feb 2020
USA: Honeywell has revealed details of its new lower GWP refrigerant
replacement for R134a in new medium temperature commercial
refrigeration, chillers and heat pumps.
Solstice N15, designated R515B by ASHRAE, is an A1 non-flammable
refrigerant blend with a GWP of just 293 under AR4.
A blend of R1234ze (91.1%) and R227ea (8.9%), R515B is said to have zero
glide and low discharge temperatures with an efficiency to match R134a.
R515B is designed for new equipment and is not a retrofit product for
existing systems. Honeywell lists its applications as remote condensing
units, supermarket multiplex systems, stand-alone units, medium
temperature side of cascade systems, flooded systems and high ambient
air conditioning.
It has already been approved for use by Danfoss in its new Turbocor
TG490 compressor for air- and water-cooled chiller applications.
The blend’s component R227ea is little used as a refrigerant due to its
very high GWP of 3220. It is used here in a small proportion to suppress
the mild flammability of the low GWP HFO R1234ze. While R1234ze is
classified as an A2L refrigerant, it is only flammable above 30°C. EN
378, which is harmonised with the EU PED directive, does not recognise
R1234ze as a hazardous substance, but as a PED group 2 fluid.
R227ea was originally introduced to replace the CFC R114 and as a zero
ODP alternative for the fire suppressant Halon 1301. It is also used in
metered dose inhalers and in some foam blowing applications.
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