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Derek M
@derek-m
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Joined: Mar 4, 2021
Last seen: Sep 19, 2024
Profile Activity
Topics: 7 / Replies: 4403
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RE: Do setbacks save energy without compromising comfort?

It would appear that I am not making myself clear. Could you please identify the day within your data when the OAT was at its lowest extreme and the...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps don't work: debunking myths & misconceptions

@editor It is claimed that a condensing gas boiler should be in the region of 90% efficient, so dividing your Energy Out figure by 0.9 should provid...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

You obviously misunderstood my post. The 'specified operating parameters' that James was kind enough to suggest, were that the IAT should be within 0....

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

The Laws of Physics would indicate that reducing the IAT by 1C should reduce electrical energy consumption by approximately 10%, so reducing IAT using...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@cathoderay Please correct me if I am wrong, but are there are now 3 versions of the y= formula. So which is correct? I suppose the 'acid test' is...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi ecodan settings

Thanks for carrying out such useful testing. It would be interesting to see what happened with IAT and COP during the above tests.  

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi ecodan settings

Have you tried e-mailing? That way you would have a dated record.

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi ecodan settings

I suspect that you are indeed correct, if the heat loss, and hence heating demand, is less than the minimum thermal energy output of the heat pump, th...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

Can you confirm, was the heat pump running almost continuously at 29C LWT when cold and cycling when operating at 27C in milder weather?

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@jamespa I ran the latest data, well the 4th of Nov bit, through my spreadsheet, which actually predicted electrical energy in to be lower than the ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

Maybe it would have been better if you had checked the quality of the data before posting.

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@cathoderay You still did not explain why, if your method is correct, the values that should have been the same on the 4th Nov. were not the same th...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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