It is a decent amount of air that needs to be exchanged, but in a passive house, it is done through a heat exchanger to recover some of the heat being exhausted rather than just letting it leak out various openings.
On Thu, Jan 20, 2022 at 3:34 PM Jan-GAMs <[email protected]> wrote: > The rate at which outdoor air replaces indoor air is described as the air > exchange rate. ASHRAE (formerly called the American Society of Heating, > Refrigerating and Air-Conditioning Engineers) recommends (in its Standard > 62.2-2016, *"Ventilation and Acceptable Indoor Air Quality in Residential > Buildings"*) that homes receive 0.35 air changes per hour but not less > than 15 cubic feet of air per minute (cfm) per person. as the minimum > ventilation rates in residential buildings in order to provide IAQ that is > acceptable to human occupants and that minimizes adverse health effects. > ASHRAE also suggests intermittent exhaust capacities for kitchens and > bathroom exhaust to help control pollutant levels and moisture in those > rooms. ASHRAE also notes that "dwellings with tight enclosures may require > supplemental ventilation supply for fuel-burning appliances, including > fireplaces and mechanically exhausted appliances. > > That is a lot of air, sounds like a large open window. not less than 15 > cubic feet per person. I don't much care for the smell of chip-board, > gives me a headache and yet that's all these freaky new houses are made of. > On 1/20/22 12:51, castarritt wrote: > > These days, people building for extreme energy efficiency will seal the > building envelope as much as possible, and then install a heat recovery > ventilation system. > > On Thu, Jan 20, 2022 at 2:26 PM Jan-GAMs <[email protected]> wrote: > >> I recall reading about houses requiring so many air changes per hour >> before they become unhealthy to live in. This article was written many >> years/decades ago. I wonder if the standards for a healthy house has >> changed? >> On 1/20/22 09:54, Andy Trimmell wrote: >> >> My dad was just talking about walls like this and we’re in Indiana. I >> don’t know where he heard it from but the guy did it about 20 years ago >> here. He said he had to open the door because they were running out of >> oxygen LOL >> >> >> >> *From:* AF [mailto:[email protected] <[email protected]>] *On >> Behalf Of *Chuck McCown via AF >> *Sent:* Thursday, January 20, 2022 12:46 PM >> *To:* [email protected]; 'AnimalFarm Microwave Users Group' >> *Cc:* [email protected] >> *Subject:* Re: [AFMUG] OT: Major off topic. Off grid home >> >> >> >> Double walls, so really there are three cavities. Two walls with an air >> space between them. Insulation and vapor barrier on the outer and inner >> wall with triple glazed windows. I read a report on these homes being >> built in Canada. They didn’t need much heat. >> >> >> >> Chuck McCown >> McCown Technology Corporation >> 8401 N Commerce Dr >> Lake Point, Utah 84074 >> 801-250-9503 >> 435-830-4306 cell >> www.mccowntech.com >> www.microtrench-blades.com >> www.terabitnetworks.com >> >> >> >> *From:* [email protected] >> >> *Sent:* Thursday, January 20, 2022 10:32 AM >> >> *To:* [email protected] ; 'AnimalFarm Microwave Users Group' >> >> *Subject:* RE: [AFMUG] OT: Major off topic. Off grid home >> >> >> >> I’ve wondered how long firewood wood really last if everyone was trying >> to use it. Wasn’t there a firewood crisis in the 19th century before >> they started using coal for everything? >> >> I think reliance on firewood in the apocalypse comes with an implicit >> assumption that everybody else died. If they haven’t died yet then expect >> competition. >> >> >> >> I don’t worry too much about water. You can’t go anywhere in the >> Northeast without tripping over a stream or a spring. If the spring water >> is contaminated then so is the well water and you’re screwed either way. >> >> >> >> How much is triple insulation? Does that mean R57 in the walls instead >> of R19? >> >> >> >> *From:* [email protected] <[email protected]> <[email protected]> >> *Sent:* Thursday, January 20, 2022 12:09 PM >> *To:* [email protected]; 'AnimalFarm Microwave Users Group' >> <[email protected]> <[email protected]> >> *Subject:* Re: [AFMUG] OT: Major off topic. Off grid home >> >> >> >> Triple insulated home can be heated by only the bodies inside. >> >> Most areas (other than where I live) there may be wood to burn. You >> could always use a parabolic solar cooker for cooking. >> >> Solar hydronic. Solar electric. Water is the huge thing. Need to pump >> a well. >> >> >> >> I think move to the tropics where you can eat off the land/sea and run >> around naked all the time. That is a good solution to the end of the >> world. >> >> >> >> Not much of a prepper anymore. Too old I guess. Plus I have an odd >> condition where I don’t get hungry. So I could starve to death without >> much suffering. >> >> >> >> >> >> >> >> *From:* [email protected] >> >> *Sent:* Thursday, January 20, 2022 9:44 AM >> >> *To:* 'AnimalFarm Microwave Users Group' >> >> *Cc:* [email protected] >> >> *Subject:* RE: [AFMUG] OT: Major off topic. Off grid home >> >> >> >> Maybe it’s a matter of being self-reliant until your solar panels break >> vs being self-reliant until your fuel runs out. Years vs months. >> >> >> >> >> >> *From:* AF <[email protected]> <[email protected]> *On >> Behalf Of *Chuck McCown via AF >> *Sent:* Thursday, January 20, 2022 10:47 AM >> *To:* AnimalFarm Microwave Users Group <[email protected]> >> <[email protected]> >> *Cc:* [email protected] >> *Subject:* Re: [AFMUG] OT: Major off topic. Off grid home >> >> >> >> That said, the last time I checked, propane and wood pellets cost half >> that of electricity for heating. And natural gas was half that again. So >> natural gas vs electric heat pump for heating would probably be the same >> energy cost. >> >> >> >> >> >> >> >> *From:* Chuck McCown via AF >> >> *Sent:* Thursday, January 20, 2022 8:40 AM >> >> *To:* AnimalFarm Microwave Users Group >> >> *Cc:* [email protected] >> >> *Subject:* Re: [AFMUG] OT: Major off topic. Off grid home >> >> >> >> 3.41 BTU per watt for resistive heating. Heat pump gives you way more >> heat per watt. That is why most of the electric cars have gone to heat >> pumps for the heater. The heat pump Tesla will run the heater for 36 hours >> and still leave you with enough battery to get home in many cases. >> >> >> >> Chuck McCown >> McCown Technology Corporation >> 8401 N Commerce Dr >> Lake Point, Utah 84074 >> 801-250-9503 >> 435-830-4306 cell >> www.mccowntech.com >> www.microtrench-blades.com >> www.terabitnetworks.com >> >> >> >> *From:* Robert >> >> *Sent:* Thursday, January 20, 2022 7:11 AM >> >> *To:* [email protected] >> >> *Subject:* Re: [AFMUG] OT: Major off topic. Off grid home >> >> >> >> The $800 mini-splits I am looking at put out about 6K BTU's of heat on >> 400 Watts. The home depot $300 heaters put out 5K BTU's but require 1500 >> watts.. Not going to do well in the winter overnight off grid... And no >> a/c in the summer... >> >> On 1/20/22 5:53 AM, Jan-GAMs wrote: >> >> $1895? For a one room ac/heater? Home Depot has something similar for >> $300. Is it the decal? Hood ornament? >> >> On 1/19/22 05:13, Zach Underwood wrote: >> >> If you have not already gotten the mini splits take a look at >> https://www.hotspotenergy.com/solar-air-conditioner/ >> >> It has direct PV inputs when sunny it would put no load on your inverter >> >> IT can be put in solar only mode where it will scale the cool/heat output >> to match the power it is getting PV >> >> It can run overnight if you wish by giving in 240volt AC connection. >> >> >> >> >> >> On Tue, Jan 18, 2022 at 7:08 PM Robert <[email protected]> >> <[email protected]> wrote: >> >> I am working on my first off grid home, and hope to do another in the >> future somewhere more northerly.. This one is in the sunbelt of N. >> Nevada and currently I have 4K of solar feeding a 30KW LFP battery bank >> through currently a Victron charge controller and a couple midnight >> solar inverters to generate a flawed 220 as well as two sides of 110. ( >> the 220 will not run the well controller even though supposedly >> configured for such. ) I am upgrading the inverters and controller to >> a >> >> https://www.signaturesolar.com/products/8kw-48v-240vac-split-phase-120a-250vdc-off-grid-inverter-by-growatt >> >> planning on doing a couple 9K mini-splits for heating/cooling. >> >> I wonder if this group has some gotchas that I might learn from in >> advance before I buy myself into a corner... I'm all ears.. >> >> thanks!! >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> >> >> >> >> -- >> >> Zach Underwood (RHCE,RHCSA,RHCT,UACA) >> >> My website <http://zachunderwood.me> >> >> advance-networking.com >> >> >> >> >> >> >> ------------------------------ >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> ------------------------------ >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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