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Does your heat pump calculate and provide you with a COP figure or do you need additional metering equipment to work out your COP? Poll is created on Nov 27, 2022

  
  

Does your heat pump calculate and provide you with a COP figure?

 
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Air Source Heat Pumps (ASHPs)
Last Post by HarriUp 2 years ago
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2009
25/12/2023 10:33 pm  

Hello Pkham, for comparison only (and I don’t know how typical our performance figures may be); we have a Daikin EDLA08 8 kW ASHP but the DHW is serviced separately by a solar / grid powered Sunamp Thermino ep210 unit, I have been tweaking our system in a 4 bedroom semi of 98 sq. metres with good insulation and recently we have fitted a Homely smart controller to the ASHP. With temperatures of 10 - 12 degrees as experienced of late, our pump is just ticking over at approx 0.5 kW/h to keep us at 22.5 degrees throughout the house 24/7. We have Octopus Cosy tariff and this means we are paying approx. £2.00 per day. Our DHW consumes between 3.5 and 4.5 kW/h daily; this adds up to 75pence daily. So for the last week at least, we are running at a cost of approx. £2.75 per day plus the despicable ‘standing charge’, we are fully electric so do not have to pay gas standing charge as well. At the end of November and the beginning of December when temperatures hovered around -2 degrees, we were using approx. 318 kW/h per week for heating, cooking, lighting, domestic appliances and DHW - costing a total of £54.11p. Our hot water needs are met by the cold mains feed passing through the Sunamp heat battery (rather akin to a gas boiler’s combi arrangement but so much cleaner). As a result, we don’t need to have anti-legionella cycling; do you have a setting to raise your water to 60 degrees C periodically? Regards, Toodles. 

This post was modified 2 years ago by Toodles

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


   
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SUNandAIR
 SUNandAIR
(@sunandair)
Noble Member Member
Joined: 3 years ago
Posts: 500
26/12/2023 3:58 pm  

Our Ecodan data is available on a daily update on the controller and gives a running total for a month or year. However If you want daily COP figures you need to write down the daily running totals and do a bit of maths, or it would appear you can get  a 3rd party program WHICH can access the ecodan stored data. 

The MELCloud App which is free from Mitsubishi will provide remote control of the HP Via a phone and also provides daily, hourly or yearly performance data but even so, a bit of maths is needed if you want to work out daily COP. 

E520DB9A 1E8A 4FE8 82C2 92B9FDDB74C6

        ENERGY CONSUMED December 23

In the above MELCloud graph I have written daily average Ambient temperatures which helps to show the increased energy needs we needed in December depending on Outside Ambient temperature changes.

I think it’s very useful to see that a cold spell can be very energy hungry compared to a moderate 10C ambient.

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        ENERGY DELIVERED December 23

Once a system is set up it is perhaps only necessary to see a monthly COP. But we have found that when we are tweeting certain settings a comparative daily COP is useful… it’s not until you see the COP for a particular day/OAT that it really means anything to the new settings. In the above graph I’ve added the daily COP values we have had for each day.

We have tweaked our settings at particular days and seen COP fall as well as rise as can be seen.


   
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 HarriUp
(@harriup)
Reputable Member Member
Joined: 4 years ago
Posts: 108
31/12/2023 2:20 am  

@pkham  I am not a Midea owner, but if I am reading your screenshot correctly you are running it to a fixed temp output of 41° not a variable output WC curve - the graph is rather simplified so it is hard to draw definitive conclusions. I presume you meant your house is 226 sq m, not ft, which is a fair size to heat and reflected in the spec of a 16kW heat pump. I would expect your system to have been designed to have an output temp of 45-50° at -3° and the unit sized accordingly. If you are adjusting the WC curve but not actually running it you might have a shock when you change over to it in the middle of winter!

Daily whole-house electricity costs are not much use here as we have no idea of your lifestyle and appliances, if you want to get into the nitty gritty of consumption and output then you need to gather figures for both.

Mitsubishi EcoDan 8.5 kW ASHP - radiators on a single loop
210l Mitsubishi solar tank
Solar thermal
3.94kW of PV


   
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