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RobS
@robs
Member
Estimable Member
Joined: Oct 15, 2024
Last seen: May 5, 2026
Profile Activity
Topics: 0 / Replies: 128
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Reply
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...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

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

Hi @sheriff-fatman The interactive versions are much better as trying to see details and cause & effect on the multiple graphs is not easy. But...

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

Hi @sunandair Thanks. The chart shows all the power/energy flows in the heating system, electrical and thermal. 1. The energy to replace the defr...

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

Hi @sheriff-fatman Cycling at 5C and below is usually defrosts. The other cause can also be an internal thermostat cycling the heat pump due to the...

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

Hi @sunandair I hope the annotated image and description below helps describe what is happening.       A) Output falling d...

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

Hi @cathoderay Yes the bulk of the energy comes from the already heated water, you can see that as the yellow area above the blue dashed line in th...

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

Hi @sheriff-fatman Freeze Stat is to stop the water in the outside pipework freezing when the heat pump is not operating (heating), it doesn't caus...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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