Solar or insulation? ecological and economical comparison

Heating, insulation, ventilation, VMC, cooling ... short thermal comfort. Insulation, wood energy, heat pumps but also electricity, gas or oil, VMC ... Help in choosing and implementation, problem solving, optimization, tips and tricks ...
EricN418
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by EricN418 » 31/10/13, 13:43

I insulate my attics with glass wool (the classic on the floor with 2 thicknesses perpendicular to one another) because I did not want to go into heavy work that cause insulation from the outside , but the sarking looks good so I told myself that when will redo the roof, why not take the opportunity to isolate from the outside and develop the attic, for the moment lost (I read about a installation of the glass wool under the roof of the interior with rafters and purlins, but it seemed complicated to do all alone).

When at the walls I am all heard. I do not have any opposite of road or safeguard of the inheritance and the interior surface is largely sufficient to be able to undergo a slight loss for the insulation. I know that the outside is more expensive but more efficient in principle.

For the floor, I would like to isolate on the floor and put a floor on it. But the same as putting, on google, there is an insulation better than all the others per page that speaks about insulators.

So rather the best performers and the best performers compared to if possible I get an idea. Preferably without danger to health yes.

Thank you for these responses.
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stef5555
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by stef5555 » 08/08/15, 00:36

the best lambda in terms of insulation and ecological, it is not the existing materials such as glass wool, polyurethane foam, etc. since the best insulation to date is not a material and if I say no stupidity it has a lamba of 0.007 is ......... the void of air!
for the moment it is reserved for big constructions like a big hall, gymnasium, etc where it is a big surface right but the disadvantage is that it costs hyper candy. pity
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by Christophe » 08/08/15, 11:17

I do not know vacuum-based insulation ??? (except very specific applications in industry or space)

If you speak of a blade of air, it is true provided not to exceed thicknesses (vertical) 4 cm!

See the very interesting diagrams of this subject: https://www.econologie.com/forums/isoler-des ... t8971.html

Horizontally I do not have the optimal thickness but I think it is much smaller than 4 cm ... because the convection vertically will be much larger than horizontally ...
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by Ahmed » 08/08/15, 11:38

It was the idea of Dédéleco to build "thermos" houses, with thin double walls under vacuum, but this is unrealistic given the enormous atmospheric pressure, it is easier to trap air in a material as less dense as possible. .
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PVresistif
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Re: Solar or insulation? Ecological and economic comparison




by PVresistif » 04/03/18, 11:31

Nuclear power in France - 80% - has several major disadvantages:
- the power plants are a little "dangerous" so we can't put them near cities (and especially PARIS of course ...)
- as we can not put them near cities we can not do heat networks (over km) to heat the houses
- so we reject the heat (1,5 times the energy produced in electricity) in the river or in the atmosphere (it warms a little well on but well it seems that it is good warming!) - a power plant of 900 MW c is 1400 MW of heat rejected (enough to heat 150 000 homes around)
- as it produces only electricity it must be consumed by electric heating ....
- as it is necessary to consume electricity available it is necessary not to isolate too much otherwise it would be necessary to close power stations .....

voila, the small French pb, country the most nuclear and the most "taxed" ..........
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lilian07
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Re: Solar or insulation? Ecological and economic comparison




by lilian07 » 07/03/18, 11:52

I had taken into account a serious study but that dates from 2008 to answer questions for an ambitious project aiming to realize an autonomous renovated house starting from the sun only.

Numerical simulations enabled me to validate this principle of insulation associated with my idea during its dynamics operation but it also allowed me to favor conceptual choices by allowing me to reduce the associated costs.



By precisely determining the influence and the importance of the technical choices I could show the influence of the most important parameters of the system thus constituted in its entirety.

I specify that the best economic system and often the best technical and ecological system ...

coût.jpg
cost.jpg (89.31 Kio) Viewed 8323 times


The first factor is of course the insulation:



The cheapest energy is the one we do not use, this simple affirmation shows the importance of insulation, before spending energy simply consider not losing it.



The need for heating the building in winter is determined solely by the thermal losses that cross the envelope. When winter is heated it is to balance the losses of the building and then only maintain a set temperature in balance with the losses.



Is a performance of 50 kWh / m² / year in renovation technically possible and profitable in a renovation? it was my goal to take into account the solar for heating.



To be efficient solar "thermal" or "electric if it is associated with a PAC" often requires adaptation of the network including heat emitters.





In conclusion, we can see that, in the current price situation (much higher than in 2008) and know-how, renovation operations are already profitable in most cases.



With the rise in energy prices, you are sure to make a good financial investment by renovating your home.

And, almost paradoxically, it is precisely the poorest who could be most directly concerned by this provision. Because renovation can restore consumer purchasing power, much more than the increase in pensions.
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josephinefaure
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Re: Solar or insulation? Ecological and economic comparison




by josephinefaure » 02/09/20, 12:56

I find it hard to imagine how we can separate solar from insulation? If we go through solar, it is necessarily that the house has been completely revised from a thermal insulation point of view before, right?
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LeaL
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Re: Solar or insulation? Ecological and economic comparison




by LeaL » 23/05/23, 14:45

Personally, I found some interesting information in this article: https://atamoz.fr/immobilier-isolation- ... exterieur/
I hope you too.
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