Quote:
Originally Posted by cRiPpLe_rOoStEr
I'm not sure about the regulations here in Brazil, but temperature control seems to be treated as more important than a renewal of the air flow.
I don't see anything similar for residential applications in Brazil.
Not sure about dirt storms being common anywhere in Brazil, even though in some regions an excessive amount of particulate matter coming from burnt bushes or burning sugarcane fields prior to the harvesting is a serious issue. What I don't understand is, as there are swamp-coolers and air conditioners meant to be used on agricultural machinery fitted with filters to clean the incoming air from the outside to the inside, the residential swamp-coolers that I often see and similar devices meant for commercial and institutional uses don't have this same feature.
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Yeah for the most part the builder just knows he isn't building a tight house so he doesn't worry about it. A friend in a 1985 home in good shape just got a blower door test done. Efficiency wise he isn't far off what i was besides lack of insulation. But ACH50 he got a 7.9 ACH (air changes per hour). Rough conversion at like around 4 pascals which is closer to normal air changes thats around a 0.5 ACH. So half of the air in the room gets replaced per hour. I think minimum is 5ach50 which is around 1/3 of the room air exchange per hour and if you go below it you need to add an actual ventilation system per whatever code your area has.
Rooster you can look up "ERV" Energy recovery ventilation. I hear they exchange air with around a 90% efficient energy transfer now on some of them. I doubt the roi is good enough to retrofit but a purpose built house would be neat