Fine tuning your ASHP performance
An interesting read and sounds like a good result in your swap from LPG to ASHP.
It sounds as though we have a very similar system to you, UFH downstairs and radiators upstairs, just wondering if I could ask you a few questions:
1. Do you get much thermal gain, if so how does your system respond?
2. Do you notice much cooling effect on the internal temperature due to wind/rain?
3. What coverings do you have over your UFH?
We have solid oak flooring over our UFH in all rooms except the kitchen. It was installed when we first moved in and were running an LPG boiler. The kitchen has ceramic tiles and generally seems to hold a more consistent temperature. The rest of the downstairs rooms fluctuate a lot more if the outside temperature drops. I am thinking that the insulating layer of wood increases the latency of the UFH. We are also running with weather compensation, but I am still tweaking it occasionally to try and get the curve right - currently 43C at -3C ambient going to 20C at 18C ambient. I am beginning to wonder if the lower end could be dropped if we didn't have the wooden flooring!
Posted by: @peterrAn interesting read and sounds like a good result in your swap from LPG to ASHP.
It sounds as though we have a very similar system to you, UFH downstairs and radiators upstairs, just wondering if I could ask you a few questions:
1. Do you get much thermal gain, if so how does your system respond?
2. Do you notice much cooling effect on the internal temperature due to wind/rain?
3. What coverings do you have over your UFH?
We have solid oak flooring over our UFH in all rooms except the kitchen. It was installed when we first moved in and were running an LPG boiler. The kitchen has ceramic tiles and generally seems to hold a more consistent temperature. The rest of the downstairs rooms fluctuate a lot more if the outside temperature drops. I am thinking that the insulating layer of wood increases the latency of the UFH. We are also running with weather compensation, but I am still tweaking it occasionally to try and get the curve right - currently 43C at -3C ambient going to 20C at 18C ambient. I am beginning to wonder if the lower end could be dropped if we didn't have the wooden flooring!
1. Do you get much thermal gain, if so how does your system respond?
Yes, we have 6m of glazed sliding doors on the south facing elevation of the property. So when it's sunny approx 1/5 of the main living area gets a bathed in sunlight. Pushes the room air temp up to 24/25ºC.
I imagine the system responds by stopping as the return flow will not be cooler than the flow out.
The ASHP is located on the north elevation so constantly in the shade.
2. Do you notice much cooling effect on the internal temperature due to wind/rain?
No, however we are surrounded by trees so the effect of cold wind isn't as pronounced as it might be on an exposed property I suspect.
3. What coverings do you have over your UFH?
We have a 60mm slab of screed covered with ceramic tiling. Yes I suspect the wooden floor is insulating and also not able to retain the heat as well as a screed floor can do. I suspect this is why I'm able to run the heating 24/7 for the same cost as compared to turning it off over night and then having to reheat the slab.
With my 'curve' (actually a slope) I do have to manually adjust the heating down as the outside temp increases.
-5ºC to 10ºC outside the room temp is a stable 22ºC but as the outside temp goes over 10ºC I adjust the FTC. In this last spell of 20ºC daytime outside temp I was running the system at -6. Probably the solar gain effect.
A quick update.
After running the system for a full year with weather compensation my actual annual ASHP energy usage is 5280kWh.
That's for both heating on 24/7 @22ºC indoors and hot water @48ºC.
-
Slash Your Heat Pump Bills Overnight
5 months ago
-
Have Consumers Been Lied to About the Efficiency of Heat Pumps Made in China?
6 months ago
-
Ecodan help with efficiency setup and design - removing manifold mixers, LLH and pumps
6 months ago
-
Ecodan wont heat with mild outside temps
7 months ago
-
Auxiliary Heating
12 months ago
- 25 Forums
- 1,514 Topics
- 31.8 K Posts
- 36 Online
- 1,285 Members
Join Us!
Latest Posts
-
RE: Say hello and introduce yourself
Hi @chandykris and you're very welcome here. Let me t...
By Transparent , 38 mins ago
-
RE: Ecodan - flow rates, sensors, settings
@derek-m The man with a watch is confident he knows the...
By Toodles , 1 hour ago
-
RE: The Illusion of Sustainability: Marks & Spencer’s Plastic Problem
I went a little further stopped eating meat or fish in ...
By Johnmo , 2 hours ago
-
RE: Ecodan ASHP - How to optimise my set up?
@rhh2348 Yes, reducing the flow rate should cause the...
By Derek M , 3 hours ago
-
RE: Delivering a smart and secure electricity system: government consultation
@ianmk13 - I think new MPs are of benefit to 'us'. At t...
By Transparent , 4 hours ago
-
RE: Vaillant aroTHERM plus not level or flat - what base is best under an external unit?
@diymax welcome to the forums. There's a new product on...
By Mars , 4 hours ago
-
RE: Samsung ASHP scheduling help
@morh Sorry to trouble you, I have installed an ESP &am...
By Ice , 6 hours ago
-
-
RE: Additional Battery v Wind Turbine v Ripple
I should add, being an investment, the value of your in...
By Old_Scientist , 14 hours ago
-
RE: VDI 2035 heating water specification
Been looking and it seems a good little project. Ever...
By Johnmo , 2 days ago
-
RE: Do I accept an ASHP and Solar Panel retrofit under the HUG 2 scheme?
Will do. I'm currently waiting for another survey / vis...
By dssr , 2 days ago
-
The company that did the borehole were expecting us to ...
By Johnmo , 2 days ago
-
RE: The Misquote That Ruined the Heating Industry
@abernyte manufacturer training is pretty average. They...
By Mars , 3 days ago
-
-
RE: ECO4 Scheme and EPC ratings
@mellow Thanks. Given there is a scheme requirement to ...
By Old_Scientist , 4 days ago
-
RE: Do I just go with the lowest quote for my heat pump?
@jancold To me its a no-brainer then, a max 40C flow te...
By bontwoody , 4 days ago
-
-
RE: Heat Pump Books Beginners – Bodge Buster & From Zero To Heat Pump Hero
@editor Presumably he had some good weather Compensatio...
By Toodles , 4 days ago
-
RE: New Vaillant 7kW aroTherm ASHP or oil boiler dilemma/decision??
Storage capacity really is dependent on storage tempera...
By Johnmo , 4 days ago
-
RE: HP Cycling, Expected or Undesirable
Just a little update. I ordered a longer shielded twin ...
By bontwoody , 4 days ago
Latest Topics
-
Ecodan - flow rates, sensors, settings
By rhh2348 20 hours ago
-
Replacing mains water with well water
By Johnmo 2 days ago
-
Additional Battery v Wind Turbine v Ripple
By bontwoody 3 days ago
-
By jamespipe 3 days ago
-
VDI 2035 heating water specification
By Johnmo 3 days ago
-
Do I just go with the lowest quote for my heat pump?
By Jancold 5 days ago
-
The Misquote That Ruined the Heating Industry
By Alec Morrow 6 days ago