Positive energy house in Vendée - offices

[Christophe]

Well it's mostly the pellet stoves (more expensive, noisy and consuming electricity ... we have nothing for nothing) which reach 90% ... then the doc speaks of a "water" boiler so ...

Here is a comparative table of wood boilers modern: 4 out of 10 boilers are not at 80% efficiency and only 3 out of 10 exceed 91%



Source: https://www.econologie.com/forums/comparatif ... t6312.html

For log stoves none does 90% efficiency: https://www.econologie.com/forums/comparatif ... t6390.html

For pellet stoves, the majority does not reach 90%: https://www.econologie.com/forums/comparatif ... t6429.html

So in fact RT2005 "forbids" log wood heating as central heating if I understand correctly?

[Eric54]

I see that the debate has generated a lot of reaction ...

Thanks to Cristophe and Christine for their research.

In short, we come back to what I said at the start:
the wood stove is not a recognized heating system for RT2005 and the design office with which I work is competent.

On the other hand, a wood or pellet boiler with high efficiency is recognized. But it is the same price as a heat pump.

So when we say that in a passive house does not need heating ... that's not true. You need one even if you don't use it.

[swift2540]

ps: I "always" wondered if 100% of the watts consumed by a pc went into heat ... an opinion?

Personally, I would have thought it was a bit like an incandescent bulb, 10% working, 90% heat, given for example the size of current fans.

But I just saw this, which talks about 50% of consumption "lost" by machines.
http://www.france5.fr/attention-fragile/

[Capt_Maloche]

no, no, it is indeed 100% of the input energy which is restored in one way or another by joules effect

What is required by thermal regulations and improved in the following, these are efficient systems to avoid wasting primary energy

then, if you use a system that is not referenced by the RT, there is a "title V" exemption which allows certification to be obtained and calculations must be justified in support of its statements (reserved for specialists)

[Christophe]

no, no, it is indeed 100% of the input energy which is restored in one way or another by joules effect

Ah ca I'm not so sure and I would not be so categorical as you, I think we are actually testing the 100% but that we are not ... in other words, I have a big doubt ...

Hard to estimate where the energy of a calculation or a graphic goes ... right?

It's a bit like a car climbing a hill: 100% of the energy is not dissipated in heat since a part is stored in the form of potential energy ... for future use ... or not !

I am wrong?

[Capt_Maloche]

So when we say that in a passive house does not need heating ... that's not true. You need one even if you don't use it.

Uh, it's up to you to install or not a heating system
it is very feasible in the south of France
it depends on your tolerance to T °

RT2005 imposes minimum performance, that's all
do not install heating, this is the maximum performance



Toff!

at an instant t, not to mention inertia or energy accumulation,

The energy supplied to a fan is 100% restored by Joule effect on the motor + by Joule effect on the stirring of the air (we calculate it for air handling units)

In a PC for example, everything that comes in (electrical energy) must be expressed either
- by Joule effect (radiators / dissipators, heating, air circulation ...
- Visible radiation (Infra red, visible spectrum ...) which itself will heat the medium as soon as it meets a surface
- Radio radiation (Wi-fi, parasites ...) which will in any case interact with the medium in the form of molecular / atomic agitation from where joule effect, as weak as that is

Unless the first principle of thermodynamics on the macroscopic scale is contradicted, it cannot be otherwise.

Did you speak Quantum?

[Christophe]

Yes but ... where do you put the useful "work"? I don't really know how to put it, I don't think it's quantum but ... I think that a small% of the energy absorbed by a pc does not end up in heat ...

The graphics that have been calculated and displayed on the screen, which therefore turn into visible "light" ... do you think it ends up in heat? Me not ... There is something else ...

Hold for a bulb it's the same: does the light emitted end up in heat? We always say that a "classic" bulb has a shitty efficiency that 5% of the energy finite in light ... that means that it is not the heat ... even in the long term if?

Finally you're right it's quantum ... we are wrong! We should go kick some ass on Futura Sciences ... they "know!"

[Capt_Maloche]

ARF!

If there were even 1 second unconverted (who would disappear?), It would mean that there would be a flight to another "dimension"

anyway, not within our reach

[bham]

I allow myself to see the initial question from another angle:

You indicate that this building does not have heating.
How do you obtain compliance with the RT 2005 standard?

I ask you this question because the estimated power to heat my building is estimated at 4kw ...
I wanted to install a simple wood stove but the building does not comply with RT 2005 (mandatory for the installation of the photovoltaic panel)...

Therefore the installation of photovoltaic panels would be subject to RT 2005 compliance; either let's start from this premise, necessary for the allocation of regional aid but does this also determine the allocation of the tax credit or even the connection to EDF?
It surprises me bcq considering the telephone canvassing that we have for the installation of such panels, there is besides a guy who comes to my house in November to advertise it to me.

[Christophe]

If there were even 1 second unconverted (who would disappear?), It would mean that there would be a flight to another "dimension"

anyway, not within our reach

Well I think that part of the electrical energy you get into your pc is converted ... into light which does not end up as heat ...

Same for TV and any light bulb ...

As you say: it's not our (bottom ) level! Still you think we can find tests of the style: Wh consumed / GFlops?

It is certain that Intel and AMD have such studies but are they public?