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RobS
@robs
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Joined: Oct 15, 2024
Last seen: Jun 14, 2026
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Topics: 0 / Replies: 134
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RE: Setback savings - fact or fiction?

True there is a variation but importantly it's understandable. The ~560W value occurs before a defrost at 5C and so the ~560W is at the colder end of ...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@cathoderay The input power is largely determined by the compressor speed (it's by far the largest component) and that is set by the controller alg...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Or part of a cycle like a defrost or ramp up. Being able to set an arbitrary interval gives the greatest flexibility and doesn't preclude the use of h...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Hi @cathoderay This is a reply to two of your posts together.   It's not a room stat per se but acting as one at the moment and its use...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Hi @sunandair I've posted charts showing the input power ramping up to the same 1-1.5kW in both (defrost and non-defrost) cases. Your image doesn't...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Hi @sunandair The analysis I previously posted was 90+ minutes long and not just 11 minutes. All of the electrical energy passing into the system go...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Hi @cathoderay If it helps any here's this period with recorded numbers: The off period is 1h22m and the on period is 2h44m, the system's steady ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

No worries! The WC curve is setup for our usual 20-21C IAT so that's what the heat pump is trying to achieve, but the "thermostat" is set lower and so...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@cathoderay As I wrote above, it's a "non-defrost restart", so it won't look like a typical defrost. The peak flow temp is only 28.5C and the CO...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

In the context of the described time periods yes but not the conclusion of the analysis, which is more important. During the defrost less electricity ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@sunandair I haven't made any claims of saving energy, @cathoderay has so maybe you are confusing the two of us? My analysis showed that a small ad...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

I was merely curious as to the resolution of the data used by the Midea control algorithm and the resolution of its outputs.   Given that...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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