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Old 05-10-2013, 08:27 AM   #1
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Window low e question.


My wife and I are concerned about our recently installed vinyl windows, triple pane, and low e. When my wife put her hand on the top pane of the window (at sunrise in the morning with sun up and window facing sun) it was very warm. The bottom pane was comfortably warm to the touch. We are concerned the low e film was put on the wrong pane of the triple pane section of the top pane. Any thoughts?

Thanks to anyone for your help.

Ron


Last edited by ramb37; 05-10-2013 at 08:30 AM.
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Old 05-27-2013, 08:33 AM   #2
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Window low e question.


It is possible that the Low-e or the glass pack was set improperly.

Where is the home located?

The likely scenario is that the glass was flipped and the middle pane has the Low-e on surface 3 vs surface 4.

There is an old trick where you hold a match up to the window in the dark of night and you can count the reflections.

  • Hold a match close to the glass
  • You should see 1 reflection for each layer of glass (i.e. 3)
  • You will see 1 less bright reflection for each surface of Low-e
  • What surface the Low-e is on can be determined by the proximity of the Low-e reflection to the glass reflection

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Old 05-28-2013, 12:59 AM   #3
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Window low e question.


Thanks for the advice. I will try this and see what happens.
Ron
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Old 04-29-2014, 09:37 AM   #4
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Window low e question.


Low-e location is climate specific.

Any cooling dominated climate, we absolutely want the low we on surface two as compared to surface three before talking about a double pane window.
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Old 04-29-2014, 10:08 AM   #5
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Window low e question.


+1 WoW

In addition to what WoW said, is it possible that you have LowE on two of the lites?

In triples coating surfaces 2 and 5 is common.
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Old 04-29-2014, 10:17 AM   #6
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Window low e question.


Sorry for the ignorenece..... could anyone tell me how you number the panes/sides of glass.....

Inside to outside????

And on double pane, which pane do you want the lowe for both a cold and a hot climate.......

Thanks.....
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Old 04-29-2014, 07:09 PM   #7
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Sorry for the ignorenece..... could anyone tell me how you number the panes/sides of glass.....

Inside to outside????

And on double pane, which pane do you want the lowe for both a cold and a hot climate.......

Thanks.....
No worries!

Glass surfaces start outside to inside.

In a dual pane the sun shines on surface 1 and surface 4 is the one with the dog nose prints from trying to see what's happening outside.

If you live in the north and you opt for high solar heat gain LowE coating on your windows, you want the coating to be on surface 3. Although U value isn't really affected by which surface is coated, glazing the coating on 3 will increase solar heat gain thru the glass and it will also result in a warmer lite.

On the other hand if you have low solar heat gain glass in your windows you want the coating on surface 2 because it will block direct solar gain thru the glass and the inner lite will stay cooler. Any LowE coating will have higher solar heat gain when the coating is on 3 and lower when on 2.

When dealing with triples there are more options.

If a triple has a single low solar gain coating it will almost always be on surface 2. However, since people often opt for the low solar gain coatings because they have slightly better U value than high solar gain coatings. Coating two surfaces will improve U value even more, so I would suggest that it is relatively rare to coat only one surface in a triple with a low solar gain coating.

Since low solar gain coatings are darker than high solar gain coatings, it isn't uncommon to mix coatings in triples - for example a low solar gain on surface 2 and high solar gain on surface 5 results in excellent u values with better visible light transmittance versus using two low gain coatings.

However if a person is looking for maximum solar gain and is willing to compromise U value a little bit then they might choose a single high solar gain coating on either surface 3 or surface 5 of the triple pane IGU.

For example, glazing Cardinal's LoE-180, high solar heat gain coating to surface 5 of a triple IGU results in a U .184 and SHGC .615.

Applying 180 to surface 3 results in U .193 and SHGC .628. Slight advantage in U value with coating on surface 5 and slight advantage in SHGC when coating is on surface 3.

If the coating is on surfaces 3 and 5 then the results are U .133 and SHGC .586. An excellent U value and not half bad SHGC either.

In a dual pane the coating on surface 3 and in a triple the coating on surface 5 will result in warmer glass both winter and summer.

Last edited by oberon; 04-29-2014 at 07:13 PM.
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Old 04-29-2014, 09:16 PM   #8
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cough....showoff...cough

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Old 04-29-2014, 09:22 PM   #9
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No worries! and ,,,,,

.
Oberon.... THANK YOU FOR GREAT INFORMATION.!!!!

That is great knowledge... clearly and precisely presented
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Old 04-29-2014, 09:24 PM   #10
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Don't feed the Oberon. His powers are too great already.

He requires the sacrifice of one young goat.
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Old 04-29-2014, 09:28 PM   #11
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Don't feed the Oberon. His powers are too great already.

He requires the sacrifice of one young goat.
Will a road kill racooin do....??????
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Old 04-30-2014, 06:28 AM   #12
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If the beast is hungry enough.
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Old 04-30-2014, 06:18 PM   #13
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Oberon.... THANK YOU FOR GREAT INFORMATION.!!!!

That is great knowledge... clearly and precisely presented
You're welcome, no problem at all, despite what SOME people think!!!
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Old 04-30-2014, 06:19 PM   #14
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Don't feed the Oberon. His powers are too great already.

He requires the sacrifice of one young goat.


Old goat here!!
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Old 04-30-2014, 06:21 PM   #15
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Will a road kill racooin do....??????
mmmmmmmmmmmmmmmm critter cuisine!!!

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