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14kW Ecodan system installed in a 370sqm new build

HJD · 2021-11-15T06:47:16Z

Morning allNew member here. I have a 14KW Ecodan system installed in a 370sqm new build (2017). It was pretty poor in terms of efficiency but I have been following all your great suggestions on the forum and I am slowly getting it working much better. Thanks for all the advice about sticking to weather compensation and also opening up all the actuators and zoned circuits and letting the FTC work it all out for itself. I now have a couple of questions for your collective wisdom:- Is the room temperature control (auto adaptation) superior to the weather compensation control option, or do they work in parallel? - If so, I don't have the wireless thermostat / controller - the FTC5 is in with the cylinder, which is obviously unrepresentative of the house. Should I buy one and would it be relatively easy to self install? - Is there value in having the wifi adaptor too and then being able to monitor usage via the MELCloud, or is that just a gimmick? Many thanks Howard

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Air Source Heat Pumps (ASHPs)

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HJD

(@hjd)

Trusted Member Member

Joined: 5 years ago

Posts: 43

Topic starter 15/11/2021 6:44 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

Joined: 6 years ago

Posts: 4425

15/11/2021 7:09 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)

Noble Member Member

Joined: 5 years ago

Posts: 1092

15/11/2021 7:25 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)

Trusted Member Member

Joined: 5 years ago

Posts: 43

Topic starter 18/11/2021 6:15 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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Joined: 6 years ago

Posts: 4425

18/11/2021 6:45 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)

Trusted Member Member

Joined: 5 years ago

Posts: 43

Topic starter 21/11/2021 9:14 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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