Okofen...It's freezing in the house :(

[Pilpoill]

Ok, are these curves, is it the boiler that gives them to you?

In this case I said nothing (but his DPE should still be instructive) I'll let you discuss between happy owner of Okofen then

Yes it is from the boilers.

And no you stay with us, we will all keep warm!

[sicetaitsimple]

Hey guys, he'd have to answer my question first...

No, because it freezes them at outside temperatures of around 5°C. Of course it would be different if the message was "it's been -5/-10°C for 3 days and I'm freezing them", there would certainly be a sizing problem. But I did not notice any episode of intense and lasting cold this winter in the Paris region. And 25kW is already not bad.
And last year with its gas boiler, a priori no problem. So the sizing of the radiators seems adapted to the insulation characteristics of the house, you just need to bring water in quantity and at a sufficient temperature.
This is not until proven otherwise a problem of dimensioning, but a problem of operation.

Edit: wrote without having seen the previous few posts.

[Bengal77]

Well, what answers, it's very nice After, not being very technical, I will do my best to provide answers:

- Insulation:
On the ground floor, the walls in contact with the exterior (interior and exterior sides) are made of rubble
joints jointed with a lime mortar, and have not been insulated either outside or inside, with the exception
of the front wall in the living room, i.e. approximately 1/6 of the surface of the ground floor walls in contact with
outdoors.
Upstairs, the crawling insulation is currently insulated only with 5 to 10 cm of glass wool or
Rock.

- Previous gas boiler power:
Boiler brand IDEAL STANDART type ALTAIS 1002/40 with a power of 40 kW.
This boiler is not a sealed gas boiler, and is not a condensing type.

- The boiler is connected, via an Okofen app.

- DPE: 206 kWhEP/m².year

voilou,

[GuyGadeboisTheBack]

We're going to relax the atmosphere, "it's freezing in the house" but....:

[Pilpoill]

Bengal, if I can watch your configurations from home I think it would be easier and above all faster.

If you agree, send me your P0060... and your login password in private message

[Christophe]

- DPE: 206 kWhEP/m².year

With electricity or just for heating? If you just have the heating part it would be nice to specify it...I know that now they can include electricity too...

Well, we're going to do something very approximate then and assume that it's only heating...

90% distribution efficiency gives 206/0.9 = 230 kWh/m².year "boiler output power"...
85% boiler efficiency, we therefore have a "boiler input" PE (= bill) of 230 / 0.85 = 270 kWh/m².year

For 240 m² we therefore have a total energy of: 270 * 240 = 64 kWh or 800 L of fuel oil/year... that's not nothing at all!

But 1L of fuel oil = 2 kg of pellets... There is already a problem with the silo which should be twice as large to fill once a year.

Well if we assume that 1/3 is electricity we would fall to 4500 L of fuel oil...it's better but it's still high! The silo remains insufficient...

As I said above: 70% of annual consumption occurs in the coldest 4 months of the year...with a ladle.

Which gives you an average power to provide during the heating months of: 45000 * 0.7 / (4 * 30.5 * 24 ) = 11 kW and this 24/24...

From this table corner calculation, your 25 kW boiler must therefore run during the winter months at about 50% of its power...

It's very approximate but it gives you an order of magnitude of the operating rate!

The best thing would be for you to give the curves like that of Pilpoill above...if I understand them correctly, his boiler is around 50% power regulation...exactly what I have just estimated in your case. ..

ps: not read in detail the 1st message because I don't have an Okofen boiler...

[sicetaitsimple]

90% distribution efficiency gives 206/0.9 = 230 kWh/m².year "boiler output power"...
85% boiler efficiency, we therefore have a "boiler input" PE (= bill) of 230 / 0.85 = 270 kWh/m².year

I do not think so. To my knowledge, the DPE is expressed in primary energy, at least for the most recent ones. Maybe it was different before, I don't know.

[Christophe]

Oh damn, I went too fast! In addition he noted kWhEP above...so the 6500L become 5000L and the 4500L...3300L which is just compatible with a 7 Ton silo...

That's the order of magnitude, to understand in more detail, it has to show its curves...

[Christophe]

And no you stay with us, we will all keep warm!

Uh keep warm with a Pilàpoil I do not know if it's reasonable!

[sicetaitsimple]

.so the 6500L become 5000L and the 4500L .... 3300L which is barely compatible with a 7 Ton silo...

But why are you pissing us off with your "fuel oil" (name of domestic fuel oil in Belgium)! Is it an SI unit?
Our friend had a heat pump and a gas boiler, and he switched to pellets!