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Daikin Altherma 3 8kW not working as needed

 
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Air Source Heat Pumps (ASHPs)
Last Post by Toodles 2 years ago
14 Posts
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Marzipan71
 Marzipan71
(@marzipan71)
Estimable Member Member
Joined: 3 years ago
Posts: 120
22/02/2024 9:41 am  

Hi @toodles sounds very much like our situation with our Daikin - we have three people in the house, two of us working from home. Our daily 'background' (non-heating, non-DHW) averages 12 kWh in the winter - from three years of data I've determined that breaks down to 5 kWh for normal variable activity, 4 kWh for non-ASHP background (e.g., average consumption when we are holiday), and 3 kWh for the ASHP 'background' - what it uses just being switched on and doing nothing useful; on top of that our DHW (two cycles per day, one 5.30am, one 1pm) averages 5 kWh. Its sounds as you say like we are in the same ballpark - albeit our absolute heating demand is higher due to sq m - we are (12 + 5 + 28.5) to your (10 + 4 + 12) for (background + DHW + heating), if I'm reading correctly. Do you use setback or is the space heating 'on' 24x7?

I think I saw an article by Protons for Breakfast where he looked at a histogram of his kWh consumption - I followed his approach and to your point it was comforting to see that yes those cold days of high consumption really are outliers - this is how my data looked last winter (total grid consumption for winter heating season 22-23):

image

If I subtract 17kWh from the data I more or less get my space heating kWh consumption - i.e., same distribution.

We also have 6.1 kWp of solar (averaging around 11 kWh p/d in this heating season, of which on average we use 9 kWh p/d), no batteries, UFH + rads, 30cm loft insulation, double glazing for comparison.



   
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Toodles
 Toodles
(@toodles)
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Joined: 4 years ago
Posts: 2727
22/02/2024 10:01 am  

@marzipan71 Hello Marzipan, I did experiment with setback but it didn’t appear to reduce consumption according to the readings. I suppose any resting time had to be compensated for when returning to ‘normal’ settings again. Both being retired, we are here most of the time so 22.5 degrees C. 24/7 suits us well. Homely is very good at holding the temperature constant for most of the time - I have found that there is a rise of 0.6 to 0.75 in the early evening and that may have been Homely making best use of OE’s Cosy tariff but I have just swapped back to Agile so will see. More later no doubt! Regards, Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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