Talk:Passive house

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A fact from Passive house (or a previous version of it) was included in the Did you know? section of the Energy Portal.

[edit] Catagories

Susten.biz 03:12, 1 March 2006 (UTC) restored the categeries copy edited by User:Dogears

To me passive house methods are not a rigid group of visually simular buildings like log cabins or craftsman cottages. Rather they are an interdiciplinary package of concepts, techniques and approaches that pull in from many sources and reach back out into many styles and disiplines. Hence the wide range of catagories

((Category:Architecture]] This is certainly architecture

((Category:Building]] Passive houses are buildings as if energy use had consequences

((Category:Energy]] A kilowatt hour conserved is a kilowatt hour for some other use

((Category:Environmental design]] if a house that uses substantially less energy with improving comfort is not env design I do not know what is

((Category:Building engineering]] Defineately simulation is a foundation tool of design engineering and of creating passively heated houses

[edit] Heat conductance

Warning: I replaced "W/qm" with "W/m²" in the text – not sure whether that's correct. However, thermal conductance is measured in "W/m*K" (watts / (meter * kelvin)". We should somewhere add information on this odd "heat conductance" thingy used in this article (assuming it exists although it seems odd to omit the temperature difference). Rl 11:12, 11 May 2005 (UTC)

thanks W/qm*k is right - I did a mistake

[edit] Natural ventilation

The following section may well be correct, however it has been removed since it is liable to cause confusion - it is impossible to meet the Passivhaus heating requirements without mechanical heat recovery ventilation.

There is an emerging trend of building designers inspired by the Passivhaus concept designing for the most part to the Passivhaus specifications, but also taking an arguably more "passive" approach of using controlled natural ventilation rather than mechanical heat recovery ventilation systems[1]. This is some quarters considered to be the greener option, as mechanical ventilation systems require an electrical input-albeit in many cases a low input as low wattage motors come into use--to operate. Another perceived benefit is that natural ventilation systems include no moving parts, and may therefore be more durable.

Gralo 20:35, 13 February 2007 (UTC)

I'm not sure "impossible" is the word. Unpractical is more correct. The difficulty arises because in order to meet the low energy consumption guidelines the temperature difference between the outgoing and incoming air must be small, which means natural convection will be very slow. Thus in order to achieve the standards you would need to connect very many heat exchangers in parallel ( which is equivalent to use one with a huge cross sectional area ). 137.205.236.51 13:04, 31 March 2007 (UTC)

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