04-28-11, 05:07 PM | #31 |
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You must have had it set to Moscow, OH, because Moscow RS (UUEE), at 56°N, had 8805 HDD (ref 65°F) last year. That reconciles nicely with the 20" of wall thickness.
56°N... that's awfully close to the arctic circle. It has to be tough to be passive when the sun is 10° above the horizon at noon on the solstice. |
04-28-11, 07:43 PM | #32 | |
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>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>> Description:,"Fahrenheit-based 5-year-average (2006 to 2010) heating degree days for a base temperature of 65F" Source:,"www.degreedays.net (using temperature data from www.wunderground.com)" Accuracy:,"No problems detected" Station:,"Airport: Moscow Vnukovo, RS (37.27E,55.65N)" Station ID:,"UUWW" ,HDD Jan,1517 Feb,1376 Mar,1072 Apr,663 May,325 Jun,160 Jul,97 Aug,134 Sep,353 Oct,694 Nov,979 Dec,1253 Total,8623 <=============== >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>> ...try something else. -AC
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04-28-11, 08:40 PM | #33 |
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04-29-11, 01:40 AM | #35 |
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The angle at which the sun's rays hit the window is much closer to perpendicular. But yes, the sun is above the horizon for no more than 6-7 hours, plus the rays of sunlight have to travel through a thicker layer of atmosphere. Here in Warsaw (52°N) the amount of energy from the sun in the winter is 4 times less than in the summer (~350 W/m2 vs ~1300 W/m2). I believe that passivhaus design for locations close to the polar circle is geared towards thermal mass, to hold as much of summer's/autumn's heat for as long as possible, and towards using heat produced by the inhabitants, cooking, and waste heat from electronics. "Don't unplug that wall wart or we'll freeze!"
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04-29-11, 03:56 PM | #36 | |
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Looking at the third plot, I see I fall in with most of the rest of the EcoRenovators, around 6000HDD/yr. This suggests an insulation thickness of 14". Hmm, that's an awful lot. AC_Hacker, you mentioned that you would do cellulose instead of foam if you could do it over again. Would you recommend cellulose over a CFC-free (e.g. CO2) blown foam as well? Hah... I've been there. Viceroy have sent me a pricelist and specification sheet for their houses... they also mentioned that their houses are well sealed, and many customers install a ventilation heat recovery system. I like everything I've seen about them so far, except the fact that new construction is a fair bit more expensive than buying used. But the opportunity to get the house I want, in the right location, sited correctly, is pretty compelling. |
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04-29-11, 04:38 PM | #37 | |
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You seem to be looking for something particular. You give the word and I'll be there in 3 days with a 16 man framing crew to do your job for less than what you are looking at. And it will be done right. PM me if you want. Last edited by S-F; 04-29-11 at 04:45 PM.. |
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05-02-11, 09:57 PM | #38 | |
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It was my impression after watching a television show on prefab houses about 5 years ago, Build one place, ship somewhere else and assemble. The show I was watching explained how instead of using nails and screws, attaching components with adhesives were used instead to speed up the process. I thought it was fascinating. I thought they used SIPs in the construction. |
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05-03-11, 06:32 AM | #39 |
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http://www.ecosteel.com/tech/insulatedpanels.pdf
EcoSteel offer a 4" structural insulated panel with R-14, and a 3" insulated panel with R-24. A 10" stack of SIP + IP + IP would have R-62, and a 13" stack would have R-86. As EcoSteel are happy to remind you, these are "whole wall performance" figures, including thermal bridging effects. So a 12" SIP would be a serious performer, perhaps even overkill for any application other than a northern Passivhaus. |
05-03-11, 09:49 AM | #40 | |
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Fine Homebuilding mag from the early part of this year, has an article on foam + cellulose, and they even talk about the minimum foam thickness required to prevent condensation. -AC_Hacker
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