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SCOP and seasonal variations

Graeme · 2024-04-28T11:01:21Z

Does anyone have a rough ready reckoner for the seasonal differences within SCOP. How different are the seasonal variations. For example if an ASHP has a SCOP at x flow temp of 3.0. What (roughly) would be the COP in say Dec/Jan compared to Jun/Jul?How wide is the variation? My reason for asking is that I am energy rich in summer. However in Dec/Jan I import electricity at night - but I currently fully use my battery capacity during the day. Any additional electricity usage will be at day rate or peak rate. So in that sense the Dec/Jan COP is more important than SCOP. (albeit I may make a biiger saving through exports in summer) [Thanks for all the comments on the other thread - really helpful.]

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Air Source Heat Pumps (ASHPs)

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Toodles

(@toodles)

Illustrious Member Contributor

Joined: 3 years ago

Posts: 1979

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

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IvanOpinion

(@ivanopinion)

Estimable Member Member

Joined: 1 year 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.

PROTONSFORBREAKFAST.WORDPRESS.COM "https://protonsforbreakfast.wordpress.com/2023/12/17/variability-of-heating-demand-throughout-a-year/"

Variability of heating demand throughout a year. | Protons for Breakfast

Friends, as I drift off to sleep at night, I often reflect on the subtle wonder of heat pumps, and last night I imagined this article in my head. However writing the article has proved more difficult than I had envisaged in my sleepy reverie. There are lots of technical details, so in case you…

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)

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Posts: 359

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)

PROTONSFORBREAKFAST.WORDPRESS.COM "https://protonsforbreakfast.wordpress.com"

Protons for Breakfast

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

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bontwoody

(@bontwoody)

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Joined: 3 years ago

Posts: 832

21/06/2024 5:21 pm

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

House-2 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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