ASHP & triple glazing

[Joeboy]

That was a good day. I've learned a little bit about the graphs and their meaning. The figure below includes a dhw run and is based over 6hrs.



On space heating alone we seem to be consistently around here.



Well worth checking all accessible pipe insulations I duct taped quite a few today. Not all heatgeeks mitre and seal properly as per the urban.plumber.

I have placed the Valliant thermostat in the front lounge. It's the room with the full wall still to be retro insulated. As a result it's sticky to climb in temperature whereas the hall with hive thermostat is reading 18.8 degs at the moment. Up from an all day of 18.5 degs. That climb occurred when I raised the heat curve from 0.2 to 0.25. I am surprised at the sensitivity of the system.

We can also now see the need for the 3G in the big lounge at the back as it lags at around 18.2 when no wbs on. All in all a great learning curve. News just in.... SWMBO did not refill the log basket this morning and the HP managed a 3 hour run on the PV today. This is truly mind bending. A big puzzle piece has clicked into place.

[Joeboy]

Sounds like the plan id go with.
Its been a while aince i looked on the HES site but i do recall some wrinkles like that hence why i flagged.
Hate to see a tiny mistake like that cost thousands, and such things do tend to be infelxible for minor errors.
Safer to get one completely under the belt and ticked off as complete, then tackle the other in my view. Ive learned that lesson the hard way with absolutely the worst luck of anyone i know!

Its a pain, but if you arent getting a grant for the 3G, the next time you need an EPC is when the house is on the market. So nice to have it on there, but not actually needed.

Thanks Nora, a lassie is contacting me tomorrow and we'll get going with that.

[Joeboy]

The electrical engineer Bartek popped in at 16.00hrs on his personal time as he had an idea and it wasn't air bubble. He thought the impeller on the sensor might be overspeeding so took the pump speed off of 100% and on to auto.

Voila, no alarm on the 16.00 to 16.30 dhw run.

[Joeboy]

Apologies, I know I've been bombing the forum with this ashp stuff. I want to get the detail down before I forget about it and have moved on.

Heat curves & weather compensation.i think they're the same thing, just different names? Looking for education.

At a 0.2 setting and no wbs running I found that the house was sitting on the lower edge of tolerable. OK but not comfy? I raised it to 0.25 and quickly felt the difference across the house and it was fine.

Not in the front lounge with insulation needs or big back lounge with 3G needs though. Fired up the wbs and running it on dry dry logs but throttled back the air. That little (co.pared to what it can do flat out) bit of lift made a huge difference.





For all you wbs owners out there? The ashp will add a level of control that's hard to believe. For all you pure ashp new owners, just up the curve a little and groove on the multiplier earned in the heat loss calc & installation phase.

I can't emphasise that enough. The job begins with the heat calc. It is then finessed with a quality install.

Once we insulate that front lounge wall and daughterlys gable end wall we'll hit the 0.2 curve. Add in the 3G and I have no idea where we'll end up but it will be smashing.

Another couple of days high temps then we'll see how weather compensating the heat curve is. Very much enjoyed this learning experience .

[Stinsy]

The electrical engineer Bartek popped in at 16.00hrs on his personal time as he had an idea and it wasn't air bubble. He thought the impeller on the sensor might be overspeeding so took the pump speed off of 100% and on to auto.

Voila, no alarm on the 16.00 to 16.30 dhw run.

That’s a win!

Pump shouldn’t have been on 100% anyway!

[Andy]

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.

Just catching up on your build Joe. That's a very satisfactory result you have going on Nice work.

That's a little how we operate. The WBS doesn't come on until closer to zero degrees outside or it is just too hot inside. The layout of the house doesn't help as the WBS causes the HP to throttle back and the rooms at the extremities are then much reduced in temp.

[Andy]

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.

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.

I tried balancing mine to get a 5C drop across the radiators and just couldn't get it to 5C, about 2-2.5C was the most.

You will find that the adhesive on the insulation can soften a bit and open when it's on a tight bend, just put some tape or a cable tie round it.

Have you reduced the pump speed for the heating loop?

[Andy]

Sounds like the plan id go with.
Its been a while aince i looked on the HES site but i do recall some wrinkles like that hence why i flagged.
Hate to see a tiny mistake like that cost thousands, and such things do tend to be infelxible for minor errors.
Safer to get one completely under the belt and ticked off as complete, then tackle the other in my view. Ive learned that lesson the hard way with absolutely the worst luck of anyone i know!

Its a pain, but if you arent getting a grant for the 3G, the next time you need an EPC is when the house is on the market. So nice to have it on there, but not actually needed.

and if you want bragging rights for a lower band, you can always chuck £70 for another EPC later

[Joeboy]

Sounds like the plan id go with.
Its been a while aince i looked on the HES site but i do recall some wrinkles like that hence why i flagged.
Hate to see a tiny mistake like that cost thousands, and such things do tend to be infelxible for minor errors.
Safer to get one completely under the belt and ticked off as complete, then tackle the other in my view. Ive learned that lesson the hard way with absolutely the worst luck of anyone i know!

Its a pain, but if you arent getting a grant for the 3G, the next time you need an EPC is when the house is on the market. So nice to have it on there, but not actually needed.

and if you want bragging rights for a lower band, you can always chuck £70 for another EPC later

I will likely do that.

When the installer was here I asked him about the start stop cycles. He said not a problem and that's how they run effectively. Woke at 7am this morning, No hot water alarm at 01.00hrs.

System run for the 6hr window is looking good. No dhw cycle in the figure though.



Go for the full day cycle which includes yesterday morning alarm and it looks like this.




Hot water is at 55 degs this morning, knocking 30 minutes off its timed run didn't affect it. So that's 90mins to a full temp hwt, all OK. I'll try 80 mins today.

Sold some power too yesterday.
Only 2.5kWhs but it's a start. No EV charge and only one washing machine run and small cooking. Only took 24kWhs to recharge stack to 100%. That performance puts this system way out beyond my most extravagant hopes.

A quick check of the oem and yes I can confirm, I'm not dreaming. This is real!

[Stinsy]

Do you need 55℃ for DHW? Maybe see if SWMBO notices 45℃…