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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 16, 2025
Profile Activity
Topics: 18 / Replies: 3391
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RE: ASHP - a few (probably dumb) questions about the lived experience

Apart from the slur on engineers/physicists (I have a degree in physics and spent the first part of my working life in engineering), I agree with almo...

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

I agree with the first point entirely. As to 'do I have any evidence that money rather than comfort is the primary driver' then I would say yes some...

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

@bontwoody In truth it is a very widely held misconception, whether we are talking about boilers or heat pumps, that turning off the heating for (sa...

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

Agree (assuming that 'draw' in the second sentence should read 'deliver'). So in the second instance at COP=4.5, 81kWh would be delivered for 12k...

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

Referring to the above Im going to try to clear up some basics, with apologies to any physicists or engineers reading! Firstly energy is measured (f...

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

If oversized then it is indeed quite possible that an overnight setback will save energy, because you are reducing the inherent inefficiency of cyclin...

1 year ago
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Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

If the energy is delivered at cop4 is xkWh then you must supply x/4kWh. If the same amount of energy is delivered at cop 6 you must supply x/6kWh. I...

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

Er no, you are confusing power and energy. You pay for energy not power. If 24kWh is required then the input energy is 24/cop. So if the cop is 6...

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

Sorry but that is simply not true and worse still is quite seriously misleading. Whilst the heating is off the house continues to lose heat. It l...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Advice needed on inefficient Samsung ASHP installation

I just ran the numbers through my WC simulator. This calculates, based on Ecodan R32 data, the efficiency gain from various WC curves relative to fix...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Advice needed on inefficient Samsung ASHP installation

It is a cop out and as I say upthread will incur a penalty of 3-6% or more if it's more than a a couple of degrees out. However installers don't was...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Advice needed on inefficient Samsung ASHP installation

This is the 'alternative method' I refer to in a post above. Care needs to be taken with the choice of room stat. Some 'clever' ones, as they appro...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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