Re: [EnergyPlus_Support] the low-e glass

["Michael J. Witte" <mjwitte@xxxxxxxx>]

You may wish to post the same question on bldg-sim which is a more general 
simulation mailing list.  For info, visit:

  http://www.gard.com/ml/bldg-sim.htm

My own sense of this issue is that low-e glass could only be a disadvantage 
during times when there is a cooling load in the space and the outside air is 
cooler than the inside temperature.  Under these conditions, if an air-side 
economizer can handle the cooling load, then if may offer no significant 
different in energy user.  At all other times, I would expect the low-e glass 
to be an advantage.  But I cannot say that I have ever run a stuy to verify 
this.  It is certainly an excellent application for a simulation study, because 
the answer will depend on the balance of conditions where the low-e glass is 
better or worse, assuming it really is ever a disadvantage.

Mike


On 7 Apr 2005, at 2:26, princeps7405 wrote:

> 
> 
> Dear all
> 
> I have got many solutions on e+ from yours for long time.
> 
> this is not a question for e+ and energy simulation but a general 
> concept to select glazing.
> 
> 
> I make a office model for energy simualtion. It has a high internal 
> loads such as occupant, lightings and office automation. The window-
> wall ratio is bigger than 90%. 
> 
> I think that a double low-e glass(6mmLE/24mm-Air/6mmCL) is much 
> benefit 
> than a doule pain glass(6mmCL/24mm-Air/6mmCL) when it is installed 
> where internal load is a low-level and heating is prior to cooling 
> such 
> as residental house needed to air conditioning at night.
> 
> Because of its low emittance of long wave radiation, some people say 
> that the low-e glass may have disadvatage at west or south perimeter 
> zone of an office, transmitted short wave radiation of sun and 
> generated much long wave radiation by occupants, lightings and OA 
> machines.
> 
> Although there are a high internal load and long solar heat gian time,
> Is a double low-e glass the best choice for the west and south face 
> of office building?
> 
> Have you exprienced to simulate that case?
> 
> or Do you have a related information for the selecting windows 
> according 
> to its internal condition and face directions.
> 
> i'm waiting advices of yours.
> 
> thanks
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
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> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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