As we all know, the most efficient way to run a heat pump is to keep it running all the time. However, I’d like to propose an alternative. I think there’s a case for turning them off. Here’s 2019-10-26 - the average temp was 9 Celsius. We can see in the evening the pumps we on all the time and my …

Continuing on this topic. If you equate the heat delivered into the house as the “distance traveled” and mpg as the equivalent of cop. Delivering the same amount of heat in shorter period of time likely requires higher flow temperatures. It is more likely that “user experience” is more equivalent…

[image] william1066: the user experience is not easily measured. Luckily I have a magic solution for that. I have users in my house that feed back their experience. When I push things too far they tell me. For example, when the heating was running for four hours continuously they didn’t not…

[image] MyForest: For example, in the last few days I’ve been playing with the pump speed. I too have been experimenting with pump speed recently. It was set to 3 in order to reduce the noise, but I’ve been wondering if it would perform better at a higher speed (from 14 ltr/min to 16 ltr/min)…

[image] Timbones: 5 4 0 Tim, thanks for taking time to format that, it really helped make it clear what I needed to do when I got to that screen for the first time ever. On my system pump speed 3 = 21L/min and pump speed 5 = 29L/min. I thought we’d hit on something good when I lowered the p…

[image] MyForest: I’m going to ruin your analogy by saying it’s like driving at 100mph and then coasting with the engine off. I don’t think it ruins it, just highlights the complexity of the variables (as you pointed out). I am trying to leverage this “coasting” by “charging” the 4.5 cubic m…

I’m using the Ecodan Demand Management Input to do deal with solar gain - just turn the heat pump off if the room gets above 21C. But that can’t cope with the opposite problem I have on windy days! I spent my first few working years doing, amongst other things, control systems for ICI (a big chemic…

[image] Rachel: the cascade loop would be slowly integrating an increase @Rachel you might enjoy this bit where we chatted about using an accumulator in a similar fashion. [image] Rachel: But that can’t cope with the opposite problem I have on windy days! I have a sort of magic soluti…

@MyForest my issue at the moment is how to get into the Ecodan controls. The ‘all weather’ variable including wind speed is a nice thing, but i guess not easily replicable. I could programme the cascade loop in NodeRed or maybe directly in an Arduino (which I’m already using for flow monitoring), b…

[image] Rachel: write a target flow temperature. Hi @Rachel You could use my existing script to do it, but the risk is that it would stop working one day for some reason and you wouldn’t be able to recover. Here’s an example where it’s just using a command line with no programming. It put t…

@Timbones Are you tempted to turn off your heat pump at 19:41 ? [image] It could bump you up from 4.37 → 4.67 CoP. (loving the deep-linking to a time window)

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Improve efficiency: Turn the heat pump off

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