Pretty new to the forum and I came across a lot of new information which i believe could help me optimize my COP.
Since 2019, I am an owner of a Daikin ERGA08DAV3/EHBH08DA9W working on a WDC as you can see below pictures. COP has been around 3-3.5 which i can tell from what I am reading in here is pretty low, considering the mild winter temperatures in Athens, Greece.
The house was built in 1980 and has a loss of Qtot =4.676 KWatt heated with radiators considered as oversized.
I tried messing with modulation setting at 3 but i am not seeing significant gains. System reaches and passes desired temperature at 21 and then stops. DT is also locked for some reason.
Any ideas on how I can improve the COP here ? Average temperature currently 10-11 Celsius in the early morning and 15-17 later in the day.
The first port of call is to reduce the flow temps on the curve. Keep reducing them until you find it doesn’t hit the target temperature and then turn them up a degree.
The left hand side 46@2 could possibly be moved left (or down), but you’d want a cold snap to see how it performs.
31@20 maybe could be moved left. I doubt you could bring it down as radiators unlikely to be able to shed the energy at lower temps.
However, this could also be a partial cause of the poor COP if it’s trying to output at 31 but overshoots straight away and cycles on and off repeatedly. Monitoring would be useful to check this (even just a power monitor). Setting the overshoot setting to 4 may improve the COP and prevent the cycling but you’d find house probably overheats. Then you need a strategy such as scheduling it on for only part of the day.
Most of our experience is with UK weather and buildings though so take any advice with caution
House loss calculation must be around Qtot =4.676 KWatt according to the engineer who made the call on which heat pump we need to install. Heat pump being 8KW, isn’t that a bit much ?
Would it be useful to limit it ? And if so, how much ?
Which setting is the overshooting ? Maybe at 2-3 would still improve COP but not overheat so much ?
I managed to reduce Delta T at 5, it seems that I am getting more heat at a lower temperature but higher consumption.
Should i leave modulation at 5 ? I am not sure which is the correct setting for my apartment.
No worries about your experience, it’s all about helping each other understand a bit more about this complicated machines!
