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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 23, 2025
Profile Activity
Topics: 17 / Replies: 2166
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Reply
RE: Do setbacks save energy without compromising comfort?

Here are all the charts in one image, to (I hope - you need a large monitor) make direct comparison easier: This is a comparison, albeit only...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@derek-m - sorry, I did make an error in one of the bar charts (second lower chart had same data as first), I have now corrected that. I have also don...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Here are charts of @derek-m's model predictions vs my observed (based on amps x volts) values for energy in (PI in @derek-m's spreadsheet), first scat...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@derek-m - thanks. I've got various other things to be getting on with today, but later on I will plot the two predictions against the observed values...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@derek-m - another reason why folks might be wary of posting their observations is that they know if they do, they are likely to get a pasting. Also a...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

You may be right. I had in mind a sort of over-running, heat that has been generated, and is visible in the LWT, but has yet to be distributed. Consid...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Equally, folks might want to complain, not getting the performance they hoped they would get etc etc. There's no shortage of such complaints about oth...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@newhouse87 - I agree, the few people who have reported their findings (very much to their credit, if only others would, then we would have a better o...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

No need to get sarky again. As far as I have been able to ascertain, the secondary pump always runs when the heating is on, as in the thermostat is ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

I've added a column, comp_on, 0 for off, 1 for on, based on amps > 0 or not. Note the htg_on_off and dhw_on_off columns are based on the three port...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

It's not you I don't trust, it is any human being (me included), as it is impossible not to see the data in the file! The fan speed might be a prox...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

I daresay this chart may be of some interest, because it covers a three day period of unusually stable outside air temps while running a six hour over...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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