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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Oct 20, 2026
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Topics: 18 / Replies: 3075
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RE: Simulation of ASHP with Gas boiler as part of decision process

We discussed this at length before, some time ago, and something has changed: the way I heat my house, going from timed oil CH to mostly (sometimes I ...

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

I'm actually doing better than that. The chart has thousands of data points, and the ('trend') line in effect averages/summarises all those data point...

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

@jamespa - @jamespa - you are still avoiding my question! Is it not the case that the divide by 2000 rough rule of thumb can give very misleading resu...

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

That chart shows heating energy in for my heat pump. Given an efficiency of 300%, then an energy in figure of 4 will give an energy out figure of 12. ...

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

I suspect two things are getting conflated here: (1) my demonstration of my method for using energy in/out to determine heat loss, using my heat pum...

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

No I didn't, either I have completely misled you somehow, or you are not reading my posts!

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

Pre-installation, standard heat loss calcs done by me and also separately by my installer (latter had one typo which did matter but was easily correct...

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

I'm not sure that answers my question (is the divide by 2000 rule of thumb unreliable?). You divided 16000kWh pa (current/historic fossil fuel use) by...

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

I do - see my previous post! Plus it also happens to be the figure decent heat loss calculations come up with.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

2 years 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 ...

2 years 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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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