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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Jul 13, 2025
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Topics: 17 / Replies: 2064
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RE: (Controversy Warning) Is it time to relax Listed Status for Insulation purposes?

@toodles - as you may recall, I have a listed (Grade II) building, and so have some experience in this area. It doesn't have to be expensive, that isn...

9 months ago
Forum
Insulation
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RE: Simulation of ASHP with Gas boiler as part of decision process

The design/heat loss calculations IATs varied between rooms, range 19 to 22 degrees, to satisfy MCS requirements. The average was 20.4, say 2 degrees ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

That's a good point, I forgot i am only dealing with a steady state linear relationship that doesn't involve a declining COP. Here's the linear regres...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I think you are making assumptions here. Review the data for Jan 2024 above, and posts passim that include setback periods. The house has a relatively...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I appreciate this thread may appear to be going off piste but I think if we take OP's original statement ('My approach is then, to simulate an ASHP wi...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

It was early days, I had little data, and only very basic (S)COP data. However, even allowing for that, the discrepancy was sufficient to create, at l...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

@jamespa - something else to add to the mix. The fact the conundrum post plot used very early data, with energy out determined by multiplying the ener...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

@jamespa - I've been giving it some thought. As I said it was a long time ago especially the oil period. I probably put the basic timer settings in de...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

Yes, that should give you a gold standard answer, but it is expensive, invasive and needs some technical expertise. Probably not Joe Bloggs' first cho...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

For what it's worth, I have just compared the independent kWh meter energy in readings with the calculated total energy in values (source (2) in the p...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I think this is perhaps unduly pessimistic. We have my n=1 experiment described above which showed a consumption based approach can work, as long as y...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I do agree, it is a minefield, however, consider the logic of my approach which only needs a steady IAT (if that isn't the case, all bets are off) and...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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