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Perhaps I am just a fuss pot - but I am curious too!

 
Air Source Heat Pumps (ASHPs)
Last Post by Toodles 2 hours ago
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2443
Topic starter 14/01/2026 2:44 pm  

With all the talk in the past about reducing ‘distortion’ that affects efficiency when the energy has to pass through a Low Loss Header, I have endeavoured to reduce these losses as much as possible by careful tweaking of the secondary pump speed.

Now, I think I have been moderately successful in achieving temperature differences between flow into and then out of the LLH to the secondary pump and then between the return flow from the emitters to the LLH and hence on to the return to the primary pipe return. Most of the time, the differential is within ~0.2 degrees either side of the LLH - so the losses are fairly low.

Come mid October, I noticed that the flow rate (dictated by the Daikin unit itself) had taken on a third level; usually the flow would step between ~28 lpm and then reduce to ~ 14 lpm. As the lower rate was the dominant, I had set the secondary pump (Wilo Pico) to match with the ~0.2 degrees difference across the LLH. From this time, the flow rate took on a dominant rate of ~7 lpm and I tweaked the secondary pump to match.

I still see the flow rate start a cycle at ~28 lpm then drop and then drop again. I am curious to know if any reader has seen similar activity and if so why this might be please? I also wonder about the efficiency at the higher flow rates as presumably LLH distortion may increase? I think the lowest flow rate still has the longest running time so suspect I should be satisfied with my present setting - but I would be grateful for any observations please. I have attached a plot of the flow and temperatures seen in the last few days.

IMG 1470

Regards, Toodles.


This topic was modified 2 hours ago by Toodles

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


   
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