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Air Source Heat Pumps (ASHPs)
Last Post by batalto 2 years ago
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 batalto
(@batalto)
Famed Member Member
Joined: 5 years ago
Posts: 1092
Topic starter 29/11/2021 11:58 am  

@derek-m my heat loss is very linear. So linear in fact the trendline is 93% accurate


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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Graham Hendra
 Graham Hendra
(@grahamh)
Reputable Member Member
Joined: 5 years ago
Posts: 110
29/11/2021 1:04 pm  

tbh if you guys are into this this much you should contact homely, they will sell you a device which hacks into the midea unit and tweaks the output as it learns the heat loss of your house giving the optimum curve. try it here, ive seen it work on the midea, it is very impressive, me i have a RED, it just gets on with it on its own. https://www.homelyenergy.com/

 

tell them i sent you 


Heat pump builder


   
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 batalto
(@batalto)
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Joined: 5 years ago
Posts: 1092
Topic starter 29/11/2021 1:09 pm  

@grahamh I'll take a look - as a side note, what a terrible website. It doesn't say anywhere what they actually do, or how it works.


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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Graham Hendra
 Graham Hendra
(@grahamh)
Reputable Member Member
Joined: 5 years ago
Posts: 110
29/11/2021 1:23 pm  

thats techys for you 


Heat pump builder


   
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 batalto
(@batalto)
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Joined: 5 years ago
Posts: 1092
Topic starter 01/12/2021 11:06 am  

I will be on a heating measurement adventure in the loft in the next day or two. My aim? To discover what my low loss header is actually doing. Specifically I want to know which of the below scenarios represents my current system.

 

image

 

Potentially I might just buy one of these - LINK - as its basically disposable (£20) and will give me 4 temperature sensors I can just install and use the app to monitor, rather than camp in the loft.

 


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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 Kev M
(@kev-m)
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Joined: 5 years ago
Posts: 1276
01/12/2021 1:37 pm  

@batalto 

I like the thermometer in the link and think I'll get one.  



   
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 batalto
(@batalto)
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Joined: 5 years ago
Posts: 1092
Topic starter 01/12/2021 1:56 pm  

@kev-m its £16 after discount. As long as its mostly accurate its fine for my needs.


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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2
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 batalto
(@batalto)
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Joined: 5 years ago
Posts: 1092
Topic starter 02/12/2021 1:03 pm  

@kev-m its arrived and I have to say I am impressed by the little device. I can do it all over the app and it provides me some graphs which I can use to track the readings from the monitor. It came with 4 probes, but can handle 6 - for my imprecise needs its ideal.

Now I just need to install the little guy in the loft


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


   
ReplyQuote
 batalto
(@batalto)
Famed Member Member
Joined: 5 years ago
Posts: 1092
Topic starter 02/12/2021 2:01 pm  

RESULTS - both my heating circuits are running (upstairs and down) and it would appear my low loss header is just that... low loss. In fact it seems to be operating almost perfectly. The numbers basically match at top and bottom. I cant see any evidence of mixing of water. One slight concern is that HP shows 41 degrees on its own curve, yet the temperature prior to the LLH is 37. There could be some losses on the way, but I doubt 4 degrees. However my measurements are just meat thermometers shoved inside the pipe lagging next to the pipe. Still the main concern was LLH losses causing in efficiency and this seems to be dispelled for me.

image

I am just going to leave it logging until the battery dies (apparently 200hrs, we shall see) and then I can review what might happen.


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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2
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 Kev M
(@kev-m)
Famed Member Member
Joined: 5 years ago
Posts: 1276
02/12/2021 4:42 pm  

Good result.  I've ordered one of the thermometers.  It will be good for checking and collecting evidence that my ASHP's sensors aren't recording properly.



   
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 batalto
(@batalto)
Famed Member Member
Joined: 5 years ago
Posts: 1092
Topic starter 09/12/2021 11:26 am  

Current total power purchased this month is at 532kW so far - from the heat pump hard monitor, its used 426kW, which is less than the internal app says its used. So far, given the cold, I am pretty happy. On track to use around 1.5MW in December @ a nominal 15p/kw (ignoring GO tariff) that would be approx £225.

My usual DD is £134 a month and December is supposed to be around 15% of your total heating bill (or two months worth of DD). I would say I am on track and so far pleased with my results. The house is a toasty 21 degrees all day and night.

For context last December I used 5,765kW of gas for heating and hot water.


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


   
ReplyQuote
Jeff
 Jeff
(@jeff)
Noble Member Member
Joined: 4 years ago
Posts: 497
09/12/2021 12:23 pm  
Posted by: @batalto

Current total power purchased this month is at 532kW so far - from the heat pump hard monitor, its used 426kW, which is less than the internal app says its used. So far, given the cold, I am pretty happy. On track to use around 1.5MW in December @ a nominal 15p/kw (ignoring GO tariff) that would be approx £225.

My usual DD is £134 a month and December is supposed to be around 15% of your total heating bill (or two months worth of DD). I would say I am on track and so far pleased with my results. The house is a toasty 21 degrees all day and night.

For context last December I used 5,765kW of gas for heating and hot water.

Sounding good. 

As a comparison were you getting a toasty 21 degrees day and night when you were using 5765kw of gas?



   
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