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

I think people, including me, do this simulation exercise as a bit of a sense check and to ascertain how low temperature heating affects their comfort...

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

Thanks. One more question, what is the source of your electricity meter readings and do they include anything other than the heat pump?

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

I do remember the discussion. It would be interesting, at least for me, to try to rationalise the figures. I suspect multiple factors may be in pla...

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

No problem. Something doesn't make sense and it would be good to get to the bottom of it. The divide by 2000 approach (open university says 2200) ...

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

Thanks. I am sorry that, with multiple simultaneous threads, I can't remember everything! How quickly and how much did your house cool when you wer...

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

Not doubting the data, just trying to reconcile your oil consumption with your heat pump consumption whilst assuming your house loss has remained the ...

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

Doubtless it is the case, for example if you live in an uninsulated barn heated part time, or want to run a heat pump in the same fast and furious way...

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

If this is the case and you were previously using 10MWh per annum in oil, then your heat pump is running very inefficiently not at a COP of 3, or some...

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

Agreed, so long as you average over an appropriate period, say 6-24 hrs. If you consider instant heat delivered or heat delivered over a short period...

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

How did you come to the conclusion you need 12kW (what calculation did you do?). I'm genuinely trying to understand. It doesn't prima face make much...

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

If you want to run a heat pump inefficiently then of course you will need a higher capacity. How did you come to the conclusion you need 12kW? If ...

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

Afaik there are two considerations namely pump head and water velocity (causes noise and erosion). A short piece of straight 22mm isn't going to incr...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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