Re: [Ekodum] životní cyklus rekuperační jednotky

[Max Vittrup Jensen <max AT permalot.org>]

Here is a more philosophical answer, taken from an article at the 
Natural Building Network (nbnetwork.org):

"...Our homes are our greatest investment not just financially but in 
our health, the health of the environment and in our children’s future. 
Becoming informed home buyers and occupants is the surest way to find 
and maintain a good home. The act of dwelling and all its associated 
systems was once innate cultural knowledge passed on from generation to 
generation in homes that were also passed on from generation to 
generation. Now understanding home is considered to be specialized 
knowledge. In fact most home energy rating systems assume occupant 
ignorance.
For example mechanized occupant sensors to turn lights on and off and 
operate mechanical ventilation systems are rewarded on green score 
cards. But mechanical systems inevitably break long before the life of a 
home is played out. Wouldn’t it be smarter to reward built-in 
opportunities for occupants to operate their homes wisely over the 
expected life of the building?
In our high desert climate, with large daily temperature swings, a 
combination of shading, cross ventilation and interior mass walls works 
well to cool a home without the need for mechanical intervention if 
occupants open their windows at night. These same mass walls, if heated 
by a radiant heat source, help to keep a home comfortably warm in the 
winter.

We know that less need for mechanical intervention means less energy use 
but it can also mean a healthier living environment. The ideal indoor 
climate would emulate the feel of the outdoor climate on a fine day. 
Heating air and blowing it around through duct work changes the nature 
of that air. The indoor air is depleted of health enhancing negative 
ions because they cling to metal and synthetic ductwork. Circulating 
heat via forced air tends to create stratified temperature differentials 
and makes us uncomfortable. Forced air systems are noisy. Baseboard 
heaters trap and fry dust and create pollution. Electric baseboard 
heaters emit high magnetic fields. Radiant floor heating, perhaps one of 
the more comfortable options, has long response times and creates 
temperature monotony. Does it not make ultimate sense to first design a 
home with the least need for mechanical intervention and then choose our 
intervention wisely?"
Paula Baker-Laporte FAIA is an architect and a certified building 
biology practitioner.



danielgrmela AT email.cz wrote:
> Dobrý den,
>
> existuje prosím nějaká studie posouzení celého životního cyklu rekuperační 
> jednotky pro pasivní dům ?
>
> Zajímalo by mě, zda je vůbec ta energie, kterou rekuperace ušetří na vytápění 
> větší, než energie spotřebovaná na těžbu surovin, výrobu, dopravu a recyklaci 
> celého zařízení včetně odpadních meziproduktů vzniklých při výrobě.
>
> Zda je ekologicky výhodnější nízkoenergetický dům bez rekuprace či pasivní 
> dům s rekuperací. Všechno ostatní by v tom domě klidně mohlo být úplně 
> stejné, nebo ne ?
>
>
> Dan Grmela
>
>
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