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14kW Ecodan system installed in a 370sqm new build

 
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Air Source Heat Pumps (ASHPs)
Last Post by HJD 3 years ago
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 HJD
(@hjd)
Estimable Member Member
266 kWhs
Joined: 3 years ago
Posts: 40
Topic starter 15/11/2021 5:44 pm  

Hi all thanks for the comments. Before everyone leaps to conclusions about the amazing performance I have to admit to a typing error at 7am this morning....its actually 270sqm rather than 370sqm! Which makes the stats less impressive!


   
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 Derek M
(@derek-m)
Illustrious Member Member
15283 kWhs
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Joined: 4 years ago
Posts: 4429
15/11/2021 6:09 pm  
Posted by: @hjd

Hi all thanks for the comments. Before everyone leaps to conclusions about the amazing performance I have to admit to a typing error at 7am this morning....its actually 270sqm rather than 370sqm! Which makes the stats less impressive!

Sorry Howard, you only get 5/10 for personal performance, 'must pay attention to detail'. 😉 But your systems performance is still very good, even with your smaller property.

You can obtained data for energy used and energy produced from your FTC controller, which will allow you to calculate your ASHP's Coefficient of Performance (COP), which is a measure of how efficient your system is operating. If you are not certain how to obtain this data, there are a number of videos on the internet, or you could ask one of the friendly forum members.


   
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 batalto
(@batalto)
Famed Member Member
3655 kWhs
Joined: 4 years ago
Posts: 1091
15/11/2021 6:25 pm  

@hjd we are very similar. I have a 12kw Midea unit and my floor space is 262m2

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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 HJD
(@hjd)
Estimable Member Member
266 kWhs
Joined: 3 years ago
Posts: 40
Topic starter 18/11/2021 5:15 pm  

@derek-m Indeed - definitely a D- for effort!

I calculated the COP on the Central Heating which is running at 3.7. The DHW is much worse - around 1.6


   
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 Derek M
(@derek-m)
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15283 kWhs
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Joined: 4 years ago
Posts: 4429
18/11/2021 5:45 pm  
Posted by: @hjd

@derek-m Indeed - definitely a D- for effort!

I calculated the COP on the Central Heating which is running at 3.7. The DHW is much worse - around 1.6

Hi Howard,

We will let you off this time, just don't do it again. 😎 

A Cop of 3.7 seems quite good, though it may be possible to improve this. Producing DHW is always going to have a lower COP because of the higher water flow temperature required. What is the desired temperature setting for your DHW?

You may have read in one of my earlier posts today that I am developing a spreadsheet which models an Ecodan based system. Since you have the same model as Kev (who supplied the Ecodan data), you may also find it of use.


   
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 HJD
(@hjd)
Estimable Member Member
266 kWhs
Joined: 3 years ago
Posts: 40
Topic starter 21/11/2021 8:14 am  

@derek-m I am fairly pleased with a CH COP of 3.7 under this new 'weather compensation' approach. I looked at last year's data, when the ASHP was relying on the zoned room thermostats only, and for 2020 I only achieved an equivalent COP of 2.7.

ON DHW - we have it set at 48deg which is a reasonable balance, for us, between hot water from the tap and energy efficiency. We tried both timed and immediate reheat approaches and found that immediate reheat was more energy efficient (just).

Definitely send me the spreadsheet when you have it. Thx


   
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