ASHP & triple glazing

[Joeboy]

Mail away to installers, see what they come back with on the air in dhw side.

Significantly warmer today at 11 degs. Been checking on & off and genuinely this is the figure we've seen a lot of today.

[Stinsy]

Mail away to installers, see what they come back with on the air in dhw side.

Significantly warmer today at 11 degs. Been checking on & off and genuinely this is the figure we've seen a lot of today.

That's what a sub-30℃ flow temp delivers!

[Joeboy]

Heard back from Bartek one of the company engineers. It will Purge itself, might take a couple of weeks. I'll just live with it and give them a shout in the New Year if it's not sorted itself out.

[nowty]

Heard back from Bartek one of the company engineers. It will Purge itself, might take a couple of weeks. I'll just live with it and give them a shout in the New Year if it's not sorted itself out.

Once you have refilled the system air does take about two weeks to separate from what was dissolved in the water. The automatic valves usually work but I had one which stuck and let a load of water out. I now keep the plastic cap on, but release it every now and then to release any air that has built up.

I upgraded a couple of radiators here at Nowty Towers this week, double panels instead of single and one slightly taller. One of those things which will probably never pay for themselves but was a constant niggling in my head for a few years after I installed the heat pump. About 20 litres of new water had to go into the system so I know that the small radiator at the highest point will be requiring air bleeding for a couple of weeks and maybe the hot water circuit zone too.

SWMBO has now given her approval after a day of moaning about the mess.

[Joeboy]

Nice, makes all the difference to comfort, that wee bit of extra pop where it's needed. Do you do the 5 drg drop across then when balancing? I've still to do that check but tbh they are all pretty even.

Now that I've got a handle on cop & scop what sort of performance does the stream give in scop?

As Nora predicted the WBS use has fallen. Didn't go on until after lunch yesterday as we were cooking our sticky red cabbage. Down to a 1/4 basket of logs. Much warmer day bright enough but a surprise nonetheless.



I had no takers when offering the rads for free. 5 at least were k2. A mate did ask for the thermostats & lockshields off the old system so at least they'll be second lifed.

Found this yesterday when in loft. Tsk, tsk, tsk. Will rectify today and check the rest in there. TBH it's just split from it's seal as it a lumpy section of pipe where another component is sited. Although it's a reminder that it's good to check.

[Joeboy]

Outdoors 9degs, indoors at 18.9 heating to 19, heat curve set at.0.25.



HWT was at 54.9 degs this morning so knocked 30mins off its run and put that 30 into home heating. We'll see what the HWT is sitting at tomorrow.

I can't adequately describe how good this system is to the entire house and our wellbeing. Everything I read about the positivity of ashp is true.

Edit, length of a cup of tea later and it looks like this. Bear in mind these are 30 minute grabs in time. So just really to show what these systems can do when 'low & slow' is dialled in and outdoor temps aren't around zero.

[Stinsy]

Most chat when comparing the cost of different heating systems is along these lines:
- Gas at 6p/kWh with boiler efficiency hard to determine accurately. Possibly 60-80% in the real world which makes about 9p/kWh of heat output.
- SH at 7p/kWh with 100% efficiency but the faff of having to predict tomorrow’s weather and charge accordingly.
- HP at 25p/kWh with CoP of 3 makes 8p/kWh of heat output.

So all much of a muchness with the effectiveness of SH understood only by a few.

However your battery means you’re applying cheap-rate electric to the CoP of a HP and you’ve invested in a really good HP installation. Therefore if you achieve a CoP of 5 while using off-peak electric, this results in the price you pay for heat being somewhere between 1 and 2p/kWh.

[Joeboy]

Most chat when comparing the cost of different heating systems is olongapo these lines:
- Gas at 6p/kWh with boiler efficiency hard to determine accurately. Possibly 60-80% in the real world which makes about 9p/kWh of heat output.
- SH at 7p/kWh with 100% efficiency but the faff of having to predict tomorrow’s weather and charge accordingly.
- HP at 25p/kWh with CoP of 3 makes 8p/kWh of heat output.

So all much of a muchness with the effectiveness of SH understood only by a few.

However your battery means you’re applying cheap-rate electric to the CoP of a HP and you’ve invested in a really good HP installation. Therefore if you achieve a CoP of 5 while using off-peak electric, this results in the price you pay for heat being somewhere between 1 and 2p/kWh.

Well spotted and beautifully articulated! The cop/scop thing is only a part of it. The real deal is the annual drop in bill. Add in the PV across the year and 1p to 2p per looks expensive. Add in the export tarriff and we fall face first down the rabbit hole.

Allow for where I live and the temps and I'm truly gone. Oh wait 3g still to go in too.

SWMBO is deeply impressed with the system. I can tell as she's gone quiet.

[Joeboy]

Still getting my head around the graphs. Thats an awful lot of start/stops across a 6hr graph?



Today, Tues & Weds the temps outdoors are double digit. With that in mind I've dropped the heatcurve to 0.2 and we'll.see what happens in the next 24hrs.

Dropping to 0.25 with decent temps yesterday seemed to work well. Not sure what the learning ability is of the HP, maybe it's still bedding in and learning?

[Stinsy]

Yes that is a sub-optimal number of cycles. You need to understand the cause of the cycling in order to reduce them.

It is possible they are caused by your HP operating at its lowest power setting and hitting the target indoor temp. This will be helped significantly if you lay off the WBS in these more-mild conditions. The same is true of any remaining SHs, electric towel rails, or other heat sources.

You want the WBS to relieve the HP of the need to operate at high flow temps in very cold conditions. In more-mild conditions it'll serve as backup incase of a powecut.