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Air Source Heat Pumps (ASHPs)
Last Post by mjr 3 years ago
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Mars
 Mars
(@editor)
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Joined: 4 years ago
Posts: 3367
Topic starter 05/09/2022 4:43 pm  

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)
Reputable Member Member
Joined: 4 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)
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Joined: 4 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)
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Joined: 4 years ago
Posts: 1091
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)
Trusted Member Member
Joined: 4 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
 Mars
(@editor)
Illustrious Member Admin
Joined: 4 years ago
Posts: 3367
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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From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
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 Kev M
(@kev-m)
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Joined: 4 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

 

This post was modified 3 years ago by Kev M

   
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 Derek M
(@derek-m)
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Posts: 4427
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)
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Joined: 4 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)
Prominent Member Member
Joined: 3 years ago
Posts: 301
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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