3 ms·

I should have said 100% performance. COP is typically 3-4:1 with mitsu

sokoloff 1y ago
Typical seasonal average? Sure. At -5°F? Hell no! At +5°F, they rate their own equipment to have a 2.0 CoP. https://mylinkdrive.com/viewPdf?srcUrl=http://s3.amazonaws.com/enter.mehvac.com/DAMRoot/Original/10007%5CM_SUBMITTAL_MXZ-4C36NAHZ2-en.pdf https://mylinkdrive.com/viewPdf?srcUrl=http://s3.amazonaws.c...
- throw0101a 1y ago
  Here's a Trane/Mitsubishi unit that has a COP of (at least) 3 at -13F/-25C: * https://ashp.neep.org/#!/product/156605/7/25000/95/7500/0///0 https://ashp.neep.org/#!/product/156605/7/25000/95/7500/0///... An LG unit with 2.4 at -4F/-20C: * https://ashp.neep.org/#!/product/29688/7/25000/95/7500/0///0 https://ashp.neep.org/#!/product/29688/7/25000/95/7500/0///0 Searchable database of cold climate air source heat pumps (ccASHPs): * https://ashp.neep.org/#!/product_list/ https://ashp.neep.org/#!/product_list/
  - sokoloff 1y ago
    Correct (and thanks for the link to that unit). Though it’s worth noting that that first 2 ton rated unit is putting out 0.5 tons (6k BTU/hr) at that temp and rating. That’s not going to be particularly helpful for a structure that needed 24k BTU/hr during warmer temps, meaning the owner of the unit is likely mixing in a lot of 1.0 BTUs to meet the heat loss at -13°F.
    - throw0101a 1y ago
      > Though it’s worth noting that that first 2 ton rated unit is putting out 0.5 tons (6k BTU/hr) at that temp and rating. I just did a quick search for "all" units and sorted the result list/table by COP@5F. If one was actually shopping/designing a solution then a more nuanced search criteria would be used. Further, you'd probably want to do a (US ACCA) Manual J calculation to first determine how much energy is needed (j = joules) * https://www.youtube.com/@HomePerformance/search?query=manual%20j https://www.youtube.com/@HomePerformance/search?query=manual... Then the (US ACCA) Manual S (select) to figure out your equipment: * https://www.youtube.com/@HomePerformance/search?query=manual%20s https://www.youtube.com/@HomePerformance/search?query=manual... One can lookup the 1% (or 0.4%) of coldest/hottest days for your area, which would help determine what one actually has to typically worry about: * https://ashrae-meteo.info/v2.0/ https://ashrae-meteo.info/v2.0/ * https://www.airequipmentcompany.com/2021/what-does-design-day-really-mean/ https://www.airequipmentcompany.com/2021/what-does-design-da...

Typical seasonal average? Sure. At -5°F? Hell no! At +5°F, they rate their own equipment to have a 2.0 CoP. https://mylinkdrive.com/viewPdf?srcUrl=http://s3.amazonaws.com/enter.mehvac.com/DAMRoot/Original/10007%5CM_SUBMITTAL_MXZ-4C36NAHZ2-en.pdf https://mylinkdrive.com/viewPdf?srcUrl=http://s3.amazonaws.c...

throw0101a 1y ago
Here's a Trane/Mitsubishi unit that has a COP of (at least) 3 at -13F/-25C: * https://ashp.neep.org/#!/product/156605/7/25000/95/7500/0///0 https://ashp.neep.org/#!/product/156605/7/25000/95/7500/0///... An LG unit with 2.4 at -4F/-20C: * https://ashp.neep.org/#!/product/29688/7/25000/95/7500/0///0 https://ashp.neep.org/#!/product/29688/7/25000/95/7500/0///0 Searchable database of cold climate air source heat pumps (ccASHPs): * https://ashp.neep.org/#!/product_list/ https://ashp.neep.org/#!/product_list/
- sokoloff 1y ago
  Correct (and thanks for the link to that unit). Though it’s worth noting that that first 2 ton rated unit is putting out 0.5 tons (6k BTU/hr) at that temp and rating. That’s not going to be particularly helpful for a structure that needed 24k BTU/hr during warmer temps, meaning the owner of the unit is likely mixing in a lot of 1.0 BTUs to meet the heat loss at -13°F.
  - throw0101a 1y ago
    > Though it’s worth noting that that first 2 ton rated unit is putting out 0.5 tons (6k BTU/hr) at that temp and rating. I just did a quick search for "all" units and sorted the result list/table by COP@5F. If one was actually shopping/designing a solution then a more nuanced search criteria would be used. Further, you'd probably want to do a (US ACCA) Manual J calculation to first determine how much energy is needed (j = joules) * https://www.youtube.com/@HomePerformance/search?query=manual%20j https://www.youtube.com/@HomePerformance/search?query=manual... Then the (US ACCA) Manual S (select) to figure out your equipment: * https://www.youtube.com/@HomePerformance/search?query=manual%20s https://www.youtube.com/@HomePerformance/search?query=manual... One can lookup the 1% (or 0.4%) of coldest/hottest days for your area, which would help determine what one actually has to typically worry about: * https://ashrae-meteo.info/v2.0/ https://ashrae-meteo.info/v2.0/ * https://www.airequipmentcompany.com/2021/what-does-design-day-really-mean/ https://www.airequipmentcompany.com/2021/what-does-design-da...