[Equest-users] Low-E Window Film

Daniel Knapp danielk at arborus.ca
Fri May 27 08:23:09 PDT 2011


On 2011-05-27, at 11:05 AM, McArdle, Mike wrote:

> Dan, Do You mean  decreasing the heat  load  ( not increasing )  

If the solar heat gain is reduced in winter, less heat from the sun will enter the windows and the heating load will be increased. 

>  
>  
> Thank you,  Sincerely,
>  
> Michael J. McArdle , P.E.
> Buildings Engineer II, Project Manager
> State of Vermont,
> Buildings and General Services (BGS)
> 2 Governor Aiken Avenue
> Montpelier, Vt. 05633
>  
> Office: 802-828-5650;  cell: 802-272-4828
>  
> From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Daniel Knapp
> Sent: Friday, May 27, 2011 11:01 AM
> To: Raphael, Dan
> Cc: equest-users at lists.onebuilding.org
> Subject: Re: [Equest-users] Low-E Window Film
>  
> How does the film affect the U-value and the SHGC for the window?  It sounds like the film is reducing the solar heat gain coefficient, and increasing the heating load.  You should also keep in mind that outdoor air loads can dominate the heating load in winter and that envelope effects can be minimal depending on the climate and type of building.  You may want to look into the loads reports in the SIM file to see what effects the film has on the building cooling and heating loads.
>  
> Cheers,
> Dan
>  
>> Daniel Knapp, PhD, LEED® AP O+M
> danielk at arborus.ca
> 
> Arborus Consulting
> Energy Strategies for the Built Environment
> www.arborus.ca
> 76 Chamberlain Avenue 
> Ottawa, ON, K1S 1V9 
> Phone: (613) 234-7178 ext. 113
> Fax: (613) 234-0740
> 
> 
> 
>  
> On 2011-05-27, at 10:42 AM, Raphael, Dan wrote:
> 
> 
> Has anybody successfully modeled window film installation using eQuest?  Specifically, I am trying to model the Vista EnerLogic low-e film (since it is eligible for tax incentives).  I’ve used Optics5/Window5 to construct the glass type using the EnerLogic applied film (NFRC ID# 2545) and imported that into eQuest.  When I test this retrofit in a sample building, the savings are not what I expect (~65 yr. payback, assuming $7 installed cost).  I would expect to see a payback somewhere around 10-15 years.  What bothers me is that in the model, the heating load increases, which would be expected for a typical window film, but this film claims to have savings in all seasons due to the ability to trap heat in the building.  If anybody has had any success in modeling these window films and could provide me with step-by-step instructions or any guidance, it’d be greatly appreciated.
>  
> Thanks!
>  
> Dan Raphael
> Building Performance Analyst
> Integrated Design Solutions
> Architecture, Engineering, Interiors & Technology
> 1441 W. Long Lake, Suite 200
> Troy, Michigan 48098
> tel:   248.823.2171
> fax: 248.823.2200
> www.ids-troy.com
>  
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>  
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