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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Jul 13, 2025
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
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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 ...

9 months ago
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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...

9 months ago
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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...

9 months ago
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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
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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
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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
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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
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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
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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
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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
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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
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