Re: [EnergyPlus_Support] Re: LOW-E GLASS VS BRICK WALL

My opinion is that your architect is correct. The rated thermal conductivity of 3 ply glazing with low e coating will be around 0.8 W/(m2*K), where as the wall would typically be 0.4 if you are following common international standards.

the fact that 400 mm of brick and insulation is more insulating than 30 mm of glass assembly should be indicative.

As your heating demand is minimal,Â passive solar gain through the glazing will be worse for you over most of the year.

The amount of energy spent to light a space using LED lighting is so small that the extra cooling from more natural light is likely to be much more.

So build a house without windows, live by the light of LEDs. There will also be less infiltration of hot outdoor air to cool.

Just kidding. My tip is to visit a window shop. get a sense of how dark a window appears. check the different "silvering" options. check how the performance goes up or down depending on these factors. find the combination of look and performance that you love.

we pay a price for everything. a 6 ply glazing might be perfect until you see the hinges breaking and scream at how heavy and difficult it is to open and close.

in short, you can't have your cake and eat it. As for your architect, keep him. he seems to know his stuff. I respect all architects that understand and don't abuse glass the way most do.

Am 29.05.2017 1:28 vorm. schrieb "Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>:

Â
Dear Mr. Ali,
There are two factors (at least) in play regarding the glass for your villa. One is energy use and the other is aesthetics - both are important. Â

I can speak to the energy factor in this way:
Energy use in a specific location and for a specific design and purpose is not something which can be fully evaluated with rules of thumb or even research papers; there are too many factors to condense into a simple rule or result. You have posted this question on an energy modeling forum, however - a very good choice.
I recommend that you engage a good energy modeler to prepare an energy model which incorporates all of the key factors for your villa design, and see which glazing option works best for you.

p.s., Other general factors which you might consider include visual glare and privacy. Other glazing options include shading devices and thermochromic or electrochromic glass.
On Sun, May 28, 2017 at 4:41 PM, Mohammed AlZain <energizeralzain2000@xxxxxxxxx> wrote:
Â
Dear

I am in the designing stage of my villa (located in JEDDAH, SA: 21.2854Â° N, 39.2376Â° E). I expressed my desire to the architect that 60-70% of the facade of the villa to be LOW-E glass in order to enjoy 100% natural lighting during the day and to conserve on my cooling bill at the same time. I was surprised when he said that the well-insulated concrete or brick wall is much energy efficient than even double-glazed or triple-glazed low-e glass. He added that the amount of savings due to natural lighting is off-set by the deference in energy conservation efficiency between double-glazed or triple-glazed low-e glass and the well-insulated concrete or brick wall. Especially in this location. I was puzzled, because I had a strong belief that LOW-E glass is the best option for energy efficiency enthusiast. If somebody has a professional opinion please share it with me.Â Â
Â I also would like toÂ shareÂ yourÂ opinion on myÂ emails:
energizeralzain2000@xxxxxxxxx / bussalzain2000@xxxxxxxxx
BR
Mohammed Ali
Â Â Â Â Â Â

--
James V Dirkes II,Â CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, MI 49504
(alphabet soup: PE, BEMP, BCxP, LEED AP)

Direct / Mobile: 616.450.8653
jim@buildingperformanceteam.com

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