Samsung HT Quiet R32 8KW / EmonCMS - COP vs simulated COP and zigzag pattern

[Timbones (Tim)]

@Michal_S

I guess % Carnot depends also on outside temperature and pump efficiency or ? I’ve noticed the colder the weather the lower the Carnot heat.

Hmm, that’s a fair point. Carnot is supposed to factor in outside temperature, though I have seen that it doesn’t fit manufacturer datasheet so well at the extremes. It’s possible that the condensing and evaporating offsets need tuning for R32:

Comparing Heatpump Datasheet Performance to Carnot COP

In my quest of getting more accurate estimation of power for systems without metering, I’ve been looking at datasheets a lot recently and it dawned on me that they provide the numbers to calculate Carnot COP (i.e. T_flow and T_ambient), which can then be compared against the manufacturer’s own numbers. So, I did exactly that for a Mitsubishi Ecodan 11.2 kW: [image] Here’s the same data for 3 different models, over a smaller set of values: [image] I don’t have any specific conclusions to dr…