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RobS
@robs
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Joined: Oct 15, 2024
Last seen: May 25, 2026
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Topics: 0 / Replies: 134
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Reply
RE: Setback savings - fact or fiction?

This part of our conversation started with a Samsung but no matter. My question regarding whole (integer) degree changes was because our Mitsubishi OA...

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

The Met Office API being used seems to have OATs to one decimal place. The system in question was a Samsung and not a Midea, but does your Midea WC cu...

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

The OAT in the above is from a Mett Office API and representative rather than the actual OAT, hence the staggered rise in temperature - the real OAT d...

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

I covered the energy flows, with the numbers, in great detail in . The energy used by the defrost (and the energy not delivered to the house during th...

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

Yes, here's the Samsung zoomed out:   If the OAT is rising then less heat will be lost by the property and hence during the recovery less h...

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

Exactly, it's just lag in the system.  

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

As I wrote above "in both of these cases the OAT was rising so it's possible that the WC curve of both has reduced the required flow temp, and hence t...

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

We have a good understanding of the data and don't need to reverse engineer a defrost algorithm as we are just interested in the energy flows, which u...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Same Heat Pump Size, Different Sized Homes: Would One Be More Efficient?

But the house with the warmer IAT, and hence higher flow temperatures (everything else being equal), will have a lower average COP during the heating ...

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

Hi @sunandair Thanks, if you or anyone would like to know more I'm happy to describe our setup in more detail.   @cathoderay (who has h...

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

Our system is radiators, large ones and now with DIY fan systems (so fancoil like), and is straight open loop (no buffer/LLH/etc). So no blending or m...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Advice for a novice on Mitsubishi Ecodan 6kW

Hi @sheriff-fatman No worries and hope you don't have to sit in traffic too often! Is it possible to get Home Assistant to record data points mor...

4 months ago
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Air Source Heat Pumps (ASHPs)
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