I’ve been reading the monster Daikin thread with common references to radiator balancing. [image] Thank you OpenEnergyMonitor: Octopus Daikin ASHP monitoring Chances are it isn’t. Chances are that a significant proportion of the water is short-circuiting through some radiators. The house still g…

[image] tomasmcguinness: There is another option available which will provide a speed based on the flow temperature. I would have thought your (any) boiler will work more efficiently if it can modulate power and therefore flow rate to target optimum return temperature given that’s where gas b…

It does modulate power. I can see that too. You’re saying it should be changing both power and speed at the same time? I was trying to achieve dT5 so I’m confident that my pipework and house can handle a heat pump. With my dT of about 7, the house is comfortable and the heating runs for long stretc…

[image] tomasmcguinness: I was trying to achieve dT5 so I’m confident that my pipework and house can handle a heat pump Right, I missed this point: that’s a fair experiment! [image] tomasmcguinness: Are you saying I’m missing a trick and that I really should widen the dT across flow and …

Ah, so it’s not just enough to have the return below, say, 50. You want it as low as possible to recover more heat? [image] This is from the manual. It has a fixed pressure, which kinda matches what I see I think. I will switch that the dynamic mode and see how its behaviour changes.

[image] tomasmcguinness: Ah, so it’s not just enough to have the return below, say, 50. You want it as low as possible to recover more heat? :ok_hand: spot on. This is specific to gas boilers though to be fair. Also note the following if you want (or need) to work out heat output or flow rat…

Reading through all these posts you can see how complicated we like to make things. Your heatpump manual will give you an ideal flow rate around your system but that’s based on perfect conditions which most of us haven’t got. So it’s a starting point to which you aim to achieve best efficiency and l…

I don’t have a heat pump. I’m just tinkering with my gas boiler :slight_smile:

Same rules apply just a larger delta t on a boiler because of higher flow temps, smaller radiators.

I’m struggling to get my head round the basics still… If my heat pump is delivering a dT of 5K, but I’m only seeing 3K across my radiators, should I instead be looking at the speed of the pump that’s circulating from the low loss header to the rads? What effect will that have on the performance of …

You are looking for a dt of 5 across your primaries which mean’s potentially your nearest rad maybe only 1 degree and your furthest rad will be 5 degrees because you are losing convected heat from your rads into the room. So as the water is flowing it slowly loses heat around your circuit that’s why…

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Radiator Balancing - is there an idiots guide?

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