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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Jul 28, 2025
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Topics: 17 / Replies: 2066
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RE: Grant Aerona Setback

I think this is an interesting question. In both cases, the intention is to lower output, though the reasons are slightly - but are they materially? -...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona Setback

I've just read the Grant link above ("Blog | How to control your heat pump") and it seems the terminology is somewhat confused as to what a setback is...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona Setback

Isn't this possibly over-complicating things, as I pointed out earlier, using a room stat setback acts in effect as a timer (at least it does in my ho...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona Setback

@derek-m I didn't quote you (no quotation marks, and my wording is 'appear to be firmly of the opinion', not X said Y), I paraphrased you, or you mi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona Setback

Just to add an observation on this: I did in fact manage to do this, in the cold snap last December, by using the room stat: normal target IAT is 19 d...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

That sounds very plausible, except for the fact the LWT rise appears to start just before the RWT rise, see at around 0703h. The four phase pattern is...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

Here are the minute by minute energy values alongside the minute by minute temp values I posted earlier. Note they are Wh, not kWh, and, as a sanity c...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

@rod - I do have a separate third party kWh meter that supplies only the heat pump but maddeningly it is not modbus enabled, meaning I can only get re...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

Anatomy of a cycle: here is a single cycle from my heat pump, from around 0640 to 0720 this morning. This has been the pattern for the last few days, ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

I think you may well have a good point here, particularly when the OAT gets into the defrost range. I will be doing some experiments once we have cold...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

Pretty much so, I think the core question is: do the savings made during a setback amount to more or less than the extra costs incurred (because of lo...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps are more than twice as efficient as fossil fuel heating systems in cold temperatures - Research

And the authors are hardly without an agenda. From their front page: "The Regulatory Assistance Project (RAP)® is an independent, non-partisan, non-go...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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