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SCOP and seasonal variations

 
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Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 2 years ago
28 Posts
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Toodles
 Toodles
(@toodles)
Famed Member Contributor
Joined: 4 years ago
Posts: 2694
01/05/2024 5:37 pm  

I’ve had a long chat with Aaron from Homely Technical Support this afternoon; he has explained a little more about the logic of Homely control. Though I had set a setback temperature overnight, this is not seen as an ‘Off if warmer than this temperature’ command but more a case of ‘I’ll just footle along so that when you require the normal temperature in the morning, I’ll be there and will have achieved it at the lowest cost’! We had a chat about new features including one I think is fairly new and that is ‘Cool Night Mode’ and I have now toggled this ‘on’ and having removed the setback times from my schedule, Homely will just keep an eye on temperature but not start up in the night unless the temperature drops below 12 degrees C.

Homely have also introduced several new values on the temperature tolerance range,; it is now possible to select a maximum of 5, 4, 3, 2, 1 or 0 degrees of tolerance. 

I was also told work is in hand to provide more info on various screens explaining the logic behind what Homely control is doing at that particular time and why. They will also be improving the scheduling menu and I have requested some accessibility improvements which are being sent to the app design people. There are also various ‘extras’ being incorporated for release later in the year. Altogether, a very positive chat! Regards, Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 IvanOpinion
(@ivanopinion)
Estimable Member Member
Joined: 2 years ago
Posts: 72
23/05/2024 7:00 pm  

You might find some useful information on Michael de Podesta's blog. For instance, this post shows the distribution of levels of heat demand over an average year. https://protonsforbreakfast.wordpress.com/2023/12/17/variability-of-heating-demand-throughout-a-year/

There are also posts showing how COP varies for his ASHP. https://protonsforbreakfast.wordpress.com/2023/11/01/heat-pumps-cop-envy-is-pointless/



   
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 Judith
(@judith)
Prominent Member Member
Joined: 2 years ago
Posts: 510
19/06/2024 8:35 am  

@ivanopinion (And @graeme) Michael has now updated his data and he illustrates nicely his cop over the full season, which generates his scop (3.5ish due to his use being dominated by dhw) 

https://protonsforbreakfast.wordpress.com  


2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with SCOP 4.7) open system operating on WC


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1009
21/06/2024 5:21 pm  

@judith Its a good argument for separating the heating and DHW SCOPs when comparing systems 🤔


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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