3 ms·
> Like I said, around 0 you're gonna get the worst performance, as outside temp goes down most models will see they COP actually increase (compared to ~0 C) Th
by redeeman 4y ago
> Like I said, around 0 you're gonna get the worst performance, as outside temp goes down most models will see they COP actually increase (compared to ~0 C)
This simply makes no sense, and is not to be found in ANY datasheets from any of the big manufacturers. How do you propose this will work? a given volume of air, say 1 cubic meter, has a certain amount of heat at 0C, if you take it down to -5C or -10C, that amount of heat is reduced. The heatpump can only put so much air over the heatsink, and thus the absolute amount of heat visible to the heatpump reduces as temperature goes down.
> 2.5 kW sounds severely underdimensioned for a house at -20 C though
well yeah, I have of course not installed such a heatpump (with a max draw of ~1500W in plus degrees) as my only heat source, im just trying to convey the output capabilities
- brnt 4y ago> This simply makes no sense It makes total sense, if you understand what a defrost cycle is. In the LG sheet I have in front of me its quite clearly reflected in the effective power output: a dip around zero.
- redeeman 4y agothat makes no sense. the coil will easily dip below 0C even at >0C outside, and need to defrost.
- brnt 4y agoYou're not the first havng a hard time wrapping their heads around this, but you'll get there ;)
- redeeman 4y agoreplying here as could not reply deeper in thread... Well maybe you ought to enlighten mitsubishi and panasonic, because they do not appear to have wrapped their minds around this yet. Looking at chinese manufacturers, neither have they.