[Bldg-sim] radiation through glazing

leen peeters l.f.r.peeters at gmail.com
Tue Mar 4 11:28:08 PST 2014


Joe,

that would be great!

Leen


On Tue, Mar 4, 2014 at 8:17 PM, Joe Huang
<yjhuang at whiteboxtechnologies.com>wrote:

> Larry,
>
> I'm not ready to dismiss this effect totally. When I look at a plot of
> Low-E transmissivity, it's shown to block anything from 800 nanometers on
> up, although the plot stops at 2400 (see http://www.leyboldoptics.com/
> cms/upload/downloads/S_Low_E_Coating_Apollon.pdf page 2).  Out of
> curiosity, I did a Google Search for "Low-E windows block cell phone
> signals"  and found this question raised in various web pages.  Expanding
> on what I had said previously, I do know of a building in Beijing (China
> Academy of Building Research) that did a facade retrofit a few years back,
> after which the staff reported they could no longer get cell phone signals.
>  I think I'll send my colleagues an e-mail to ask for more details.
>
>
> Joe
>
> Joe Huang
> White Box Technologies, Inc.
> 346 Rheem Blvd., Suite 108D
> Moraga CA 94556
> yjhuang at whiteboxtechnologies.com
> http://weather.whiteboxtechnologies.com for simulation-ready weather data
> (o) (925)388-0265
> (c) (510)928-2683
> "building energy simulations at your fingertips"
>
>
> On 3/4/2014 7:26 AM, ldegelman at suddenlink.net wrote:
>
>> I don't see how there could be any effect at all.  The wavelengths are
>> totally incompatible.  Low-e coatings block the near-infrared radiation at
>> wavelengths of 700 to 2400 nanometers.  Even at the ultraviolet end, the
>> wavelengths are around 100 to 400 nanometers.  The 3G and 4G networks that
>> cell phones use are way off from this.  Typically, cell phone wavelengths
>> (at 0.8 to 2.4 Ghz, the RF portion of the spectrum) are about one foot long
>> (or around 300 million nanometers) - not even in the same ball park.
>>
>> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
>> Larry O. Degelman, PE, FIBPSA, ASHRAE
>> Professor Emeritus of Architecture
>> Texas A&M University
>> //////////////////////////////////////////////////////////////
>> -----Original Message----- From: Russell Richman
>> Sent: Monday, March 03, 2014 10:00 PM
>> To: leen peeters
>> Cc: BldgSim Mailing List
>> Subject: Re: [Bldg-sim] radiation through glazing
>>
>> these types of glazing systems will help reduce EMF's from the exterior.
>>  As such, they 'may' reduce cell phone wave lengths as well.  I have not
>> come across any studies, but the physics says it is possible.
>> -russell
>>
>> On 2014-03-03, at 6:47 PM, leen peeters wrote:
>>
>>  Dear all,
>>>
>>> is there anyone aware of a negative impact of triple glazing or foils
>>> used in triple glazing on the transmittance of mobile phone signals?
>>>
>>>
>>> Any input is welcome ...
>>>
>>> leen
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