Air Source Heat Pumps

grahamc2003

jeepjunkie wrote: »

Unless you are running a huge thermal store heated by more means that just an ASHP I just don't see how it is worthwhile running an ASHP during the night.

Not sure if this is a reply to my post, but it's not relevant to GT anyhow, who has Economy 10 heating, meaning daytime cheap rates for some hours.

My suggestion was only to do with room temps/thermostat settings in the daytime, as I made clear (I think). I assume most people turn the thermostats right down at night (don't they?) or at least otherwise ensure the house isn't heated to daytime temperatures at night, so nightime use would usually be low anyhow I expect (unless it gets really cold outside, and the house isn't well insulated).

lovesgshp

gterr wrote: »

Thanks, Geotherm, and others,

Just a quick summary of how we are running now:

Room sensor influence set to 0, so effectively off, so we're relying on external temp sensor plus individual room thermostats/timers. Pump on 24/7. Room stats set between 18 C and 21 C (18 for hallways, kitchen, 21 for lounge, dining room), set-back to 18 or 19 C for a few hours in middle of day and between 10.30pm and 6.00 am. Hot water presently on 24/7 (but I may experiment with this later).
Heat curve: V=22, H=55. We are usually seeing a DHW temp of around 53, flow temp around 35
External sensor shows between 5 C and 8 C today (but must have dropped close to zero overnight since we have storm + sleet and hail just now).
Yesterday evening and this morning U/F heating failed to reach target temps in lounge and dining room. They were about 1 degree under.
Upstairs rads did get warm - just.
We used 16 units peak rate electricity plus 11 units off-peak electricity (total 27 units) in the 24 hours ending 10.30pm last night. Didn't use washing machine or dryer during this time.

Our house is a new build, 3-bed detached 1.5 storey. The lounge has external walls on 3 sides and big windows, often bears the brunt of the gales. It's the room furthest away from the pump and the manifold, which probably doesn't help. We have a wood stove in the lounge which we haven't started using in earnest yet (waiting for delivery of logs) but I have enough scrap to light it tonight, in the hope of a little cheer! Right now the warmest place in the house is always the hallway - a closed corridor. The indoor temp sensor is there and currently shows this to be at 22 C. I'm thinking of moving an chair out there!

More big storms coming!

Grateful for any comments.

Gterr.
With underfloor heating you should not drop the pump temp return more than 1.5C. Running costs will increase as the floor mass takes longer to reheat. If you are controlling it through room stats, then the equalisation could take longer. The Rego 800 is quite a complicated controller.

gterr

Geotherm wrote: »

Gterr.
With underfloor heating you should not drop the pump temp return more than 1.5C. Running costs will increase as the floor mass takes longer to reheat. If you are controlling it through room stats, then the equalisation could take longer.

Thank you. Do you think I would do better not setting back the thermostats at all?

The Rego 800 is quite a complicated controller.

You're telling me!

Many thanks for your time.

lovesgshp

gterr wrote: »

Thank you. Do you think I would do better not setting back the thermostats at all?



You're telling me!

Many thanks for your time.

Because I do not know your setup in full, it is difficult to comment in detail as I can only generalise. Do you have a copy of the commissioning checklist, as this could help.

gterr

Geotherm: Sorry, no. I have copies of the installation manual and users manual. That's all.

lovesgshp

No problem. there is a report check list that the final engineer fills in with all the settings. Without that, I am trying to guess the reasons.

TiredGeek

I too am in the Highlands, but my place is an old croft house

My EcoDans (2 x 14kw) have been a nightmare from day 1 and have used a great deal of electric. Hopefully that will be fixed shortly as a few letters from an engineering consultant has made the installer see sense and offer to fix the system. We'll see how that goes and report back......

I've fitted these to each ASHP http://www.savingenergyonline.co.uk/product/264

It allows us to keep a very acurate eye on running costs and as only the ASHP are on these meters they are showing correct figures. Just fit them between your existing circuit breakers and the ASHP.......
I got mine cheaper on eBay

Cardew

TiredGeek wrote: »

I too am in the Highlands, but my place is an old croft house

My EcoDans (2 x 14kw) have been a nightmare from day 1 and have used a great deal of electric. Hopefully that will be fixed shortly as a few letters from an engineering consultant has made the installer see sense and offer to fix the system. We'll see how that goes and report back......

I've fitted these to each ASHP http://www.savingenergyonline.co.uk/product/264

It allows us to keep a very acurate eye on running costs and as only the ASHP are on these meters they are showing correct figures. Just fit them between your existing circuit breakers and the ASHP.......
I got mine cheaper on eBay

I thought the system was going to be ripped out??

Please keep us updated on consumption through winter.

[Deleted User]

TiredGeek wrote: »

I too am in the Highlands, but my place is an old croft house

My EcoDans (2 x 14kw) have been a nightmare from day 1 and have used a great deal of electric. Hopefully that will be fixed shortly as a few letters from an engineering consultant has made the installer see sense and offer to fix the system. We'll see how that goes and report back......

I've fitted these to each ASHP http://www.savingenergyonline.co.uk/product/264

It allows us to keep a very acurate eye on running costs and as only the ASHP are on these meters they are showing correct figures. Just fit them between your existing circuit breakers and the ASHP.......
I got mine cheaper on eBay

Hope it all get's sorted one way or another Tiredgeek

BozMo

So why did you choose Ecodans? I have been trying to compare COPs of heat pumps at the same temperature difference.

Broadly ones which give around COP 4 heating 7C to 35C do not seem to compare well (thats Danfoss, Ecodan). Ones I have found which appear significantly better on quoted data to be better than this is:

Grant Aerona 155 quotes 7/35C COP as 5.8

Does anyone have experience of this one?