64kW used and 184kW delivered yesterday in total for CH.
COP 2.55
w/m2 244
Posted by: @batalto@derek-m I think the sensors are integral. The only external sensor is in the hot water tank. Perhaps @grahamh can help. He seems to be the man who knows the Midea units better than anyone else
Hi Batalto,
Sorry for the delay in replying.
I have read through the Midea manual, and it would appear that you are correct, the water temperature sensors are located within the ASHP itself, though there is the option of installing an external water flow temperature sensor, but not a water return temperature sensor, which seems a little strange. Did you measure the water temperatures on your pipework and did they differ from the displayed values?
Besides making the operational changes that I have just suggested to Kev, one way that you could make your system more efficient would be to increase the heat output rating of your heat emitters, which should allow you to run your system at a lower water flow temperature.
@derek-m I did just have a look with my meat thermometer
On the ASHP controller it says I should be 43 and 37 on my inlet/outlet. From my science of stick the meat thermometer onto the side of pipe and wait a bit, I got 41 and 36 degrees. I am fairly confident that;
1) The meat thermometer might not be the best at measuring water flow temperatures in pipes, than say a chicken
2) Pressing it against a pipe under some lagging might not give the most accurate contact to measure from
3) The ASHP probably has its number close as dammit doesn't matter
4) I'm a better engineer than a scientist
@kev-m given I use my meat thermometer to measure hot water pipes - I'm not convinced that I am perhaps good at either
@derek-m I imagine there are a range of factors which will affect it. Given how cold it currently is, I'm not too bothered. However a better COP would always be appreciated.
Perhaps I need to consider the next steps of how to make it better - bypass the low loss header etc
Posted by: @batalto@derek-m I imagine there are a range of factors which will affect it. Given how cold it currently is, I'm not too bothered. However a better COP would always be appreciated.
Perhaps I need to consider the next steps of how to make it better - bypass the low loss header etc
Hi Batalto,
Rather than jumping in and making changes, I find the best approach is to think things through first.
Draw a schematic of your system, showing approximately where any sensors are located. With the system operating note down as much data as possible about the temperatures around the system.
Measure as accurately as possible, the inlet and outlet temperatures around your low loss header.
Then sit down and analyse what appears to be happening within your system.
@derek-m after mapping my w/m2 (input, not after COP) to ambient I am getting fairly confident with the power demand expected from the ASHP. From the trend line its also pretty accurate with an R of 93.
Some more data will slowly fill in the gaps and give me a pretty good estimate for any given day and I can just multiply this by my house area (262m2) to get my expected kW demand. I can also now compare this to the heat loss given when the pump was installed.
Thanks Batalto and Kev,
That is highly useful. It does indeed show, as suspected, that the heat loss is not a linear function against ambient air temperature, but does increase exponentially as the ambient air temperature falls. We obviously need more global warming. 😆
- 22 Forums
- 2,070 Topics
- 45.3 K Posts
- 16 Online
- 3,343 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
Fair enough. With R290 heat pumps, which seems to be...
By JamesPa , 2 hours ago
-
RE: Heat pump installation and BUS Grant timings
EPC no longer necessary Here is the link to the part...
By JamesPa , 4 hours ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
@benson Ours is ‘resting’ for the summer now (unless we...
By Toodles , 5 hours ago
-
RE: Home energy storage & battery register
@jamespa To a certain extent, by exporting to the grid ...
By Toodles , 7 hours ago
-
RE: Jokes and fun posts about heat pumps and renewables
@transparent ‘Protein’s extra Luv’.
By Toodles , 14 hours ago
-
RE: Forum updates, announcements & issues
@editor Fairy Nuff Mars, I doubt that my ramblings woul...
By Toodles , 1 day ago
-
RE: Antifreeze top up for my heat pump - is this a rip off?
@johnmo You are correct, standard Ethylene glycol used ...
By Brendon Uys , 1 day ago
-
RE: Confusion about heat pump sizing
We’ve published a deep dive into heat pump sizing, and ...
By Mars , 2 days ago
-
We’ve published a deep dive into heat pump sizing, and ...
By Mars , 2 days ago
-
RE: Kensa GSHP finally installed - now to start the optimisation process
Just had a quick scan of the manual and should be weath...
By Johnmo , 2 days ago
-
RE: Potentially more choice including air to air heat pump grants
Hi all, I agree, the consultation documents are alway...
By madbilly , 2 days ago
-
RE: Commencing on an ASHP Installation Process
I think those are pretty much the standard figures that...
By JamesPa , 2 days ago
-
RE: Load Compensation and Weather Compensation
I think that maybe what the adia thermal system does, b...
By JamesPa , 2 days ago
-
RE: Enabling WiFi: Samsung ASHP on Smart Things App
@old_scientist @profzarkov thanks to you both for the v...
By Grahamh-uk , 2 days ago
-
RE: Nibe F2040 periodic warm water increase fails
@tribol here's an official reply from NIBE on your case...
By Mars , 3 days ago
-
RE: Vaillant & OVO partner up to offer Heat Pump Plus
@ecodan-efficiency On the other hand, the fact that the...
By Richard24738 , 4 days ago
-
RE: How accurate was your heat loss survey?
@scalextrix for our house 1950s detached the air leakag...
By Judith , 4 days ago
-
-
RE: Air Changes per Hour - ACH and the MCS requirement
@matwin If you plan to commission one it might b...
By JamesPa , 4 days ago