Click the link. They are happy to explain SGHC of 0.52 IIRC Not so surprising to find, btw. PH requires no more than 0.14 U value in it's windows, which is about R-7
I call horse$hit, 4 panes with argon adds up to 5.5 R, 10 + for triple Wth I was expecting vacum sealed basement bricks or something, they are not really explaining this or maybe argon has a higher value than I was acounting for, I wonder how CO2 would do everyone bitches its a green house gass that could work here. that first picture looks verry much like I had in mind
Blue, I try to read your long posts but truthfully I do not have a lot of success. I need sentences and paragraphs.
besides I thought the frame is supposed to have a higher R value and improve the total, 3 panes of glass will be heavy, I guess its fine if you want to install a couple but I am looking at a much larger project wonder what will they cost /sqft delivered because if I have to take a mortgage just for the glass kindof defies the point, honestly the certs don't mean $hit to me, laws of phizics still apply, I have to look into this, we allready settled this in the earlier calculations, I may have some wrong numbers I think you mentioned your air filled double add up to 3 + Corwin may have understated some numbers, and those coatings don't add R value,
The coatings are extremely important. U value is actually a combination of insulation and emissivity. The coating is for the latter. Read Corwyn's post for a great explanation. The frame is a separate area for heat loss. Great glass but lousy frame makes a lousy window.
haaa, so the emisivity adds to the U value, read the post earlier explaining it, HMMM still dont buy it yet, need to learn more hard data, I read lots of such manufacturers claims / explinations, I don't see it yet
unless thay claim SI u values as Passive House does, thought those were 3 times the us standard, it's important which u value we're talking about
R-value (US) = RSI × 5.678263337 I saw that in wiki so my theoretical 5.5R 4pane is more li 1 SI, this don't add up something is missing
Thermal transmittance - Wikipedia, the free encyclopedia ok so maybe coatings can increase the R value, I have yet to comprehend that, but even in this article shows triple panes to about R7, 10+ I don't know about that
The 5.6 conversion factor is for U values Are you talking about the glass, or the window (glass + frame) ?
This is from the wikipedia link you posted (my bolding): Typical thermal transmittance values for common building structures are as follows: single glazing: 5.7 W/m²K; single glazed windows, allowing for frames: 4.5 W/m²·K; double glazed windows, allowing for frames: 3.3 W/m²·K; double glazed windows with advanced coatings: 2.2 W/m²·K; double glazed windows with advanced coatings and frames: 1.2 W/m²·K; triple glazed windows, allowing for frames: 1.8 W/m²·K; triple glazed windows, with advanced coatings and frames: 0.8 W/m²·K;[1] ------------ The units tell you that the numbers are Euro. So the bolded entry has a U(american) of 0.8/5.6 = 0.143 and an R(american) of 1/0.143 = 7. Note that this is for a complete window. The manufacturer I linked to does about 15% better with their best windows, reaching about R - 8. I'm pretty sure they buy glass from the same places other window makers have access to, so the the improvement is in the frame.
the way I look at it the improvement is in the glass, R8 frames are not that hard to do, in other words they are full of it on the glass side, I have to look into this, see what those calculators are all about the germans could calculate a whole building with acuracy I can do a square of glass god dam it
http://windows.lbl.gov/software/window/6/tarcog%20mathematical%20model.pdf skip to page 26 LBNL Windows & Daylighting Software -- WINDOW Welcome to the Efficient Windows Collaborative LBNL Windows & Daylighting Software -- WINDOW came across this stuff last night not sure if I posted it, enough monkeing arround time to get to the bottom of this
I've been tinkering with that window software, there's no way barely got a 7 out of quadruples with argon and low e , bet if you called those people in the morning and asked them what exactly are those windows made of they will have to get back to you, even the frames are European lumber, sounds to me like a get rich quick resale operation out of grandmas basement, if there are such windows out there I want to know who makes them and how the heck they pulled it off. one other thing I noticed, the SHGC normally listed is for summer gain, does me no good, in that software it shows NA, typical more concerned with summer ac than winter gain ( what is that ) I know most of such windows must be installed a certain way, probl for that explanation Corwin came up with
Heat Mirror is an extremely high performing, energy efficient glass system which dramatically improves thermal insulation and indoor comfort
