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Heatgeek
@heatgeek
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303 kWhs
Joined: Dec 16, 2024
Last seen: Mar 10, 2025
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Topics: 0 / Replies: 40
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@jamespa It is all about design choices. In my view heating at extreme low end temperatures is a small minority of overall heating which might not eve...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@sunandair Posted by: @sunandair "If the weather curve is set correctly then the house envelope will never reach the set temperature and therefor...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@sunandair I think I understand what you are getting at with “widest range”. This is not an easy dilemma. You are right about radiator over-size at 15...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@sunandair Regarding radiators, UFH and WC, system design can have some quirks. Say one designs for the following:i) -3C design temperature with a mat...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 I am now totally confused how your minimum output 6kW heat pump is coping with <3kW load without serious cycling, but never mind. R...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 In the light of this discussion, could you maybe share what is happening on your system as you have a 13kW heat pump in a low-loss passi...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 Your u-values stack up with the amount of insulation installed. I presume therefore that you also have MVHR. As the peak heat load is wa...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 I think we have some misunderstandings here. You previously indicated that you have a passive house (<10W/m2 or ~5kW peak loss) but i...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 I have perused your data again. As far as I can see there is no way that you can efficiently use such a large HP to directly heat your e...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 Sorry, I forgot to say that in my second case of 12 hour heating period, a double size HP would be required i.e. 10kW to deliver double ...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@jamespa I have been quietly following all of this in amazement at some of the statements, especially about over-sized HP’s being more efficient. The ...

1 month ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat loss calculators and spread sheets

@sicky This one is not too bad if you have all the correct data. It is just tedious getting the data and filling it all in as there is a lot of detail...

3 months ago
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