Honeywell has been researching and developing low global warming refrigerants for over 10 years to replace HCFCs. They have developed refrigerants such as 1234yf for auto air conditioning and 1234ze for foam insulation with global warming potentials less than 10. For stationary air conditioning applications, they are exploring hydrofluoroolefin (HFO) blends such as L-41 and N-20 that have global warming potentials less than 500 and can replace R-410A and R-22 with similar or better performance. Testing shows these refrigerants can be used in existing equipment without major redesigns.

1. Low Global Warming Replacements for HCFCs in Stationary Air Conditioning Equipment. Mark W. Spatz, Global Leader Refrigerant Technology, Honeywell Refrigerants

3. HFO Blends for Stationary Applications N Series (A1) L Series (A2L) L-41 GWP <500 R-410A GWP=2088 L-YF GWP = 4 L-ZE GWP = 6 N-13 GWP ~600 HFC-134a GWP=1430 L-20+ GWP <350 N-20 GWP ~1000 HCFC-22 GWP=1810 L-40 GWP~200-300 N-40 GWP~1300 (retrofit) N-20 GWP~1000 (new equip) R-404A GWP=3922 Lowest GWP Option (Mildly Flammable) Reduced GWP Option (Non-flammable) Current Product

7. Replacing HCFC-22 in Air Conditioning Systems L-41 / HFC32 HCFC 22 CO 2 HFC 410A HFC 407C Operating Pressures System redesign necessary if using refrigerants with higher operating pressures Non-flammable GWP = 2088 Properties enable cost-effective efficient system Non-flammable GWP=1824 Can utilize R-22 design Non-ozone Depleting Low GWP Highly flammable GWP<20 Mildly flammable GWP<350 Utilize R22 Designs Very high pressure major design changes needed Poor efficiency GWP = 1 Mildly flammable GWP = 675 (R32) GWP < 500 (L41) R410A Performance R32 - high discharge T Hydro Carbons HFO Blend L-20

11. A/C for Hot Climates There are Viable Options for Stationary A/C Systems Operating in Hot Regions

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