答复

1. Expert Member
   Zephyr7|Mar 10, 2019 12:10pm|#1

   Those are the surface numbers the coatings are applied to. Surface numbering starts with the exterior (outdoor) surface as #1, then the side of the outer glass pane that is inside the window’s internal air space is surface #2, the side of the inner (indoor) pane facing the windows internal air space is surface #3, and the interior (indoor) surface of a double pane window is surface #4.

   如果您正在看一个三窗格窗户，则表面5和6分别是玻璃最内向窗格的内部空域侧和室内侧。

   A “surface 4” coating on a double pane window is an exposed coating on the indoor side of the window, probably cardinals i89 coating or something similar. I would let them apply coatings to the surfaces they recommend and not try to rearrange things.

   Bill

1. 
   k t|Mar 10, 2019 02:51pm|#2

   Awesome, thanks! That's really helpful. So I'm guessing the values before the surface numbers denote the emissivity (sp?), with lower value indicating more "reflective".

   I think there are pros/cons to the room side coatings, i.e. condensation/cleaning hassle, depending on Zone.

1. Expert Member
   Zephyr7|Mar 10, 2019 03:40pm|#3

   I have found this document:
   https://www.cardinalcorp.com/source/pdf/technical_glass_guide_web.pdf
   在涂层规格方面非常有用。请注意，这是针对红衣主教玻璃Igus的，但是每个人的基本概念都是相同的（物理学总是物理:-)

   I89 effectively lowers the surface temperature of the innermost pane of glass and that means you’ll get interior condensation at higher outdoor temperatures than you otherwise would. There is some detail about that in the document I linked, as well as a handy chart. Cardinal claims the coating is just as durable as the uncoated glass would be, with the one exception that there are certain types of cleaners that you must not use.

   Bill

1. 
   k t|Mar 10, 2019 08:25pm|#4

   很棒的参考，谢谢！

   The doc actually decodes the last piece of the puzzle, the chart on Page 3 lists LowE coatings and their emissivity. 0.022 is their LowE3-366 coating. 0.149 is their LowE-i89 product (which is indeed the indoor lite coating).

   So the Marvin window I was looking at has that combination.
   Looks like all the 0.25 to 0.27 U factor options have that combination. At 0.28 they have the 0.022 366 coating on one inside surface only. Not a huge tradeoff (drops from R4 to R3.6), and condensation resistance jumps from mid 40s% to 59%.
   http://search.nfrc.org/search/cpd/cpd_search_detail.aspx?cpdnum = mar-n-375

   现在我已经弄清楚了Jeld Wen列表要容易得多，因此产品代码提供了所有线索。他们似乎比Marvin提供的涂料排列更多。

   http://search.nfrc.org/search/cpd/cpd_search_detail.aspx?cpdnum=jel-n-877

   Curious if anyone has had any experience with fogging/scratching of interior coatings.

2. Expert Member
   Peter Yost|2019年3月11日上午11:04|#5

   Hi KT -

   It's relatively new for window manufacturers to use low-e coatings on exposed surfaces. But our low-e storm windows of course have exposed low-e coatings to the interior and for the last 18 years plus, we have been moving these glass panes about and cleaning them. They are sort of a "gritty" texture but nary a scratch.

   Peter

1. 
   k t|2019年3月15日上午10:24|#6

   感谢彼得，我认为您描述的那些风暴窗涂料可能是硬涂料（天花素）涂料，但我的理解是i89（Surface 4 Low-e）并不是真正的硬涂层（不是Pylololitic）。

   From Cardinal: "LoĒ-i89 is an improvement to the previous LoĒ-i81® by improving light transmission in the monolithic form by approximately 8%. The patented LoĒ-i89 coating is an Indium Tin Oxide (ITO) coating applied by the sputtering process."

3. Expert Member
   Peter Yost|3月16日，2019年06:43 AM|#7

   谢谢K t-

   你说的对;我的低E涂层是硬外套。有趣的是，了解新技术意味着可以裸露的溅射涂料。

   Peter

4. 
   节俭|Mar 16, 2019 01:42pm|#8

   Just a note: I don't think you will find it on their website, but JW Siteline Clad windows are available triple glazed. They should provide a U value in the .18 range.