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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 14, 2025
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Topics: 17 / Replies: 2848
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RE: Simulation of ASHP with Gas boiler as part of decision process

Looks interesting, what are the axes as it looks like consumption goes up as temperature goes up, IE the wrong way round.

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

With your 3kW house (lucky you!) its not surprising that solar gain has a major effect, but then nor does it matter too much if you oversize the heat ...

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

I am. The assumptions were based on what you had said, were reasonable based on the limited information, and were necessary to explain the measured r...

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

Yes, Yes, Yes. MCS admit that the current method is not entirely satisfactory, I have it in an email. But they say they 'dont have an alternative'....

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: British Gas versus Octopus: Two possible heat pump routes - how to evaluate them?

resistance is useless!

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

Three reasons I suspect: 1. I presume that the calculation assumes a room temp of 20/21 not 18.6. That does make a difference 2. Calculated heat ...

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

Whilst this may be true I don't think we can be certain of that conclusion based on your one example. You are not comparing apples with apples. Yo...

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

@cathoderay Winter 23/24 was milder than 22/23. Previously you multiplied input energy by SCOP, whereas in fact it should be multiplied by COP. I...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Antifreeze Valves

Indeed. Several of the manufacturer installation guides I have read say that freeze protection must be fitted. Installers tend to cling to what the ...

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

Thanks. (I think you have probably provided the explanation for the apparently anomalous consumption (10MWh vs ~24MWh which would be expected for a 1...

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

I agree with the first sentiment, I was being provocative. Practically speaking one can download smart meter readings and degree days. These should...

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

@cathoderay Since you are convinced (and have sone evidence) that your house heat loss is 12kW, let's take that as read and see where it takes ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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