4 ms·

Looking at the tradeoffs of CO2, r744, I don't see it gaining adoption. Quick search shows 10x pressure vs r134a. That pressure difference is significant on si

• benj111 3y ago
  >Also at non-low ambient temps it's apparently less efficient so the useful range is quite limited. Surely it depends on efficiency curves, and local climate. If it's marginally less efficient above 0c and much more efficient below then it would still be a win in many climates. Further, the very coldest days tend to be less windy, and also tend to be the days when you want most heat so if your generation backbone is based on wind, co2 would still be the best choice, if only to minimise demand at the worst possible points.
  • irjustin 3y ago
    > Surely it depends on efficiency curves, and local climate. Yeah and i'm still trying to understand the enthalpy curve of the two systems but at the same given temp it's way further along the X-axis for 33'C[0][1]. 33'C is a pretty common for a huge chunk of the earth. If it was way cheaper to implement then of course cold locations would work really hard to adopt it. but with 10x pressures, there's no way, right? [0] https://onlinelibrary.wiley.com/doi/full/10.1002/ese3.976 https://onlinelibrary.wiley.com/doi/full/10.1002/ese3.976 [1] https://onlinelibrary.wiley.com/cms/asset/cf698e11-dfed-489c-b818-b3d1925132e4/ese3976-fig-0004-m.jpg https://onlinelibrary.wiley.com/cms/asset/cf698e11-dfed-489c...