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SCOP

Air Source Heat Pumps (ASHPs)

Last Post by mjr 4 years ago

10 Posts

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Mars

(@editor)

Illustrious Member Admin

Joined: 6 years ago

Posts: 4865

Topic starter 05/09/2022 4:43 pm [#492]

I’m curious to know what everyone’s SCOP on their ASHPs is. If you’ve been running your pump for a year (one winter and one summer) I’d love to know who has an annual COP of over 3.

Please pop your numbers below.

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prjohn

(@prjohn)

Estimable Member Member

Joined: 5 years ago

Posts: 125

05/09/2022 7:30 pm

I can only use the Carnot number from Emoncms HP app. Using the Carnot formula my number is 4.22. My total energy usage for the year 3634kwh. The "SCOP" number compares to previous oil usage of 1600litres/annum (16000kwh) and estimated energy usage from EPC and estimated energy usage from heat loss calculation.

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sav0

(@sav0)

New Member Member

Joined: 5 years ago

Posts: 2

06/09/2022 4:08 pm

How do you work out the COP some say its yield divided by consumption and others say yield plus consumption divided by consumption??

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batalto

(@batalto)

Noble Member Member

Joined: 5 years ago

Posts: 1092

06/09/2022 5:03 pm

COP is heat delivered divided by power consumed.

So 100 kW / 20 kW = 5 COP

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE

👍

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DChilton

(@dchilton)

Eminent Member Member

Joined: 5 years ago

Posts: 18

12/09/2022 4:21 pm

On my system (Vaillant Arotherm Plus 5kW hybrid system) it is showing from 1st January through to today, it has consumed 686 kWh and the yield is 3605 kWh, so a COP of 5.25, so happy with that, although the numbers are obviously a bit of a fudge as the boiler kicks in when the COP would be lower.

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Mars

(@editor)

Illustrious Member Admin

Joined: 6 years ago

Posts: 4865

Topic starter 12/09/2022 5:08 pm

Our lifetime COP is 2.71 as we enter our fourth winter with this heat pump.

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Kev M

(@kev-m)

Noble Member Member

Joined: 6 years ago

Posts: 1276

23/09/2022 1:39 pm

Not sure if this has been posted. Theoretical but interesting.

https://www.linkedin.com/pulse/scop-who-goodies-baddies-graham-hendra/?fbclid=IwAR0wK1Y66Mi0GmV-qi9firNsCvOvxDYVgvHWnZuUpzwKU7JX8UeD0ol_llU

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 6 years ago

Posts: 4425

23/09/2022 1:57 pm

@kev-m

It would be interesting to see the same data for a LWT of 40C.

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Kev M

(@kev-m)

Noble Member Member

Joined: 6 years ago

Posts: 1276

23/09/2022 5:42 pm

Posted by: @derek-m

@kev-m

It would be interesting to see the same data for a LWT of 40C.

That's just what I was thinking. I think it's from publically available data from MCS if you have some time on your hands 🙂

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mjr

(@mjr)

Reputable Member Member

Joined: 5 years ago

Posts: 303

03/10/2022 1:41 pm

We just had the first annual service. Ecodan R32 8.5kW as sole source for heating and hot water. Reading the numbers off the controller works out to 3.15 for the year. I was expecting lower because the hot water figure (captured on a third-party app called MMSPHeatPump) isn't great, even in summer.

👍

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