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> What refrigerants are you considering as there is more environmental stuff coming out killing 410A. I'm also interested in this. Specifically, I'm interested
by Panino 4y ago
> What refrigerants are you considering as there is more environmental stuff coming out killing 410A.
I'm also interested in this. Specifically, I'm interested in R-744 (CO2) as it has a GWP (global warming potential) of only 1. R-32 (Difluoromethane) has a GWP of 675 while R-410A has a GWP of 2088. Japan has had R-744 heat pumps for years now.
Drawdown lists refrigeration improvements as the single most effective method (we need to do all of them) for combatting climate change.
https://www.drawdown.org/the-book https://www.drawdown.org/the-book
- cmui 4y agoSome background on CO2 systems. On the one hand, great, because CO2 has a GWP of 1 as you point out. On the other, the operating pressures are much higher than other conventional refrigerants (80+bar vs 20bar). Because of this high pressure the components are more expensive, and you don't see any field installs of refrigerant lines like in a mini-split setup. Instead the CO2 systems typically come as factory sealed air-water systems.