[Equest-users] Diferents result with differents U-value in Weather 2A

[Joe Huang]

Dante,

How are you modeling the two types of windows in eQUEST and EnergyPlus?  
If you're using the Simple Window Model in both programs, the difference 
may be due to different assumptions about the solar heat characteristics 
in their Simple Window Models. Without seeing the inputs, I can only 
guess, but it looks like with EnergyPlus the only change is in the 
U-value, which as you say has a small effect due to the small delta Ts, 
but with eQUEST, there may also be changes in the solar heat gain, which 
would also impact the building energy use.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com
http://www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

On 5/22/2013 9:33 AM, Dante Garcia wrote:
>
> Hi all,
>
> I am new using eQuest, I made a model in the DDWizard.
>
> When I use a high performance glass U-value = 0.31, I got less 
> efficiency than when I modeled using an U-value =0.70, and the 
> difference is about 4%, using enegyPlus, that is the program that I 
> have been using for a year show me differences in less than 0.5% 
> selecting diferents U-value because the range of temperatures is 
> between 15-29 in a whole year in my country)
>
> PDta: This is my first model using eQuest (I have another model that a 
> friend gave me, I change the wheater and model with both performance 
> of glasses and I got same result, So, I think that the problem is in 
> my model)
>
> Someone ran into with this problem?
>
> Any help will be appreciate,
>
> I have been using the sim file to figure out the problem but I could 
> not find indoor temperatures in each space.
>
> *Dante Garcia *
>
> *LEED Green Associate*
>
> **
>
>
>
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