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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 4, 2025
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Topics: 17 / Replies: 2106
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Reply
RE: Midea ASHP – how to set weather compensation

@mphb - thanks, a useful link. Using google translate, I found the post contains this: "There are 8 heating curves pre-programmed, with "1" being th...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Midea ASHP – how to set weather compensation

That is exactly what weather compensation is, and it is what you want. One zone, no TRVs (with very rare exceptions) and weather compensation. Strictl...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Midea ASHP – how to set weather compensation

@iwolf - I have a very similar if not the same heat pump. Yours has a suffix, perhaps that means it is the German model. I don't speak German I'm afra...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: (Controversy Warning) Is it time to relax Listed Status for Insulation purposes?

My reading of the rules is that secondary glazing is definitely OK in listed building. The only alteration is a removable magnetic strip, on a par wit...

11 months ago
Forum
Insulation
Reply
RE: (Controversy Warning) Is it time to relax Listed Status for Insulation purposes?

Hmm, the joys of old buildings! Are the metal frames mounted in wooden frames, as is often the case? If so, and enough exposed surface is available, t...

11 months ago
Forum
Insulation
Reply
RE: (Controversy Warning) Is it time to relax Listed Status for Insulation purposes?

@toodles - perhaps more likely cool chilled out bats, the heat pump after all puts out cool air. But good to be free of bat poo. @majordennisbloodno...

11 months ago
Forum
Insulation
Reply
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...

11 months ago
Forum
Insulation
Reply
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 ...

11 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...

11 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...

11 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...

11 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...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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