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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 14, 2025
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Topics: 17 / Replies: 2131
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RE: Simulation of ASHP with Gas boiler as part of decision process

I should have explained more. The 300% efficiency is actually based on my monitored energy in/energy out (energy out divided by energy in), and is a l...

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

I am not sure the divide fossil fuel kWh by 2000 rule of thumb works. I was going to remark 16000kWh per annum is rather on the high side, suggesting ...

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

All sound stuff apart from the TRVs - aim not to use them at all, except when you have no alternative (which should be rare, preferably never eg use t...

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

That sounds promising. Do you still have the heat loss/rad sizing calculations used to select your current rads? If you do, they may add some more inf...

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

I strongly endorse this. Some of the quotes I had from various goons claiming to be heating engineers had hopelessly out of whack rad specs. For radia...

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

I have a small old leaky listed building with limited wall space. As a very general rule of thumb, if you have correctly sized radiators for a fossil ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My horrific Samsung heat pump installation and experience

I'm not sure they do. Take the first chart in your second to last post, this one: I take it this is what we conventionally call LWT, the tempe...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

@jamespa - I owe much of my meagre but at the same time much improved understanding of the thermodynamic principles involved to your many generous con...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

We have been here before, on the question of continuous vs intermittent heat pump running, and the effects on costs and comfort. My conclusions to dat...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My horrific Samsung heat pump installation and experience

@iantelescope - I think we need to clear up what we mean by cycling, and then short cycling. To me something that cycles is something that regularly m...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My horrific Samsung heat pump installation and experience

I did say earlier I wondered weather Samsung's obfuscated implementation of weather compensation meant it was easy to mix up OAT and Set LWT, and that...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My horrific Samsung heat pump installation and experience

I appreciate the Samsung jargon doesn't help, on one level it is upside down and/or inside out. I find it easier to think in the xx @ yy format, LWT a...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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