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Derek M
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Derek M
@derek-m
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Illustrious Member
Joined: Mar 4, 2021
Last seen: Sep 19, 2024
Profile Activity
Topics: 7 / Replies: 4405
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RE: Performance in the current cold snap…

I think that a defrost is likely to cause an increase in reading from the OAT sensor, because not only is hot refrigerant gas being pushed through the...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@iancalderbank A sensor should not suffer from 'wind chill', since it is not a heat source.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@cathoderay One of the problems with correctly analysing the data from your system is that we don't know the true OAT. I think that most correctly...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Another ASHP Performance Thread - 13kW Grant Aerona

If you remove the insulation from around the flow rate indicator, you should be able to see details of the make and model. Google these details and se...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat pump size advice – is 16kW overkill for this property?

Based upon the available information, I would say your assessment looks to be correct. One thing that I learned many years ago is that people can ma...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

As CR has stated, those are indeed defrost cycles, though I suspect they are being exacerbated by the two major problems from which his system suffers...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

It is always good to see charts from correctly operating heat pump systems.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost Cycles - How Common Are They?

If my understanding is correct, it may be the temperature to which the refrigerant gas falls within the evaporator before the build-up of ice is suffi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost Cycles - How Common Are They?

What is the actual temperature at the radiators and what is the temperature drop across the PHE?

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

@scrchngwsl If you wish I will post a copy after I have updated for the OHS capability.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pump size advice – is 16kW overkill for this property?

Has the controller been correctly optimised?

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

@scrchngwsl Well done. It looks like you are getting there. If I am understanding your formulas correctly, they should produce somewhat similar re...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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