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

[Dante Garcia]

Hello Joe,
Thank you

I just have change u-values in both cases.
I am usinq this propierties: (NFRC Ufact=0.31, SHGC=0.25, VT=0.57)

[cid:image005.jpg at 01CE56EA.38A47100]
And using this in the other case:
(NFRC Ufact=0.70, SHGC=0.25, VT=0.57)
[cid:image006.jpg at 01CE56EA.38A47100]

I did not have change anything more. And got that different (4%) when running each model. I see that I can change more data in equest but in both models I maintained that data iqual.
I think that there is a problem in my model. Because is too much difference.

I used Energy Plus just to compare. And I set just U-values, SHGC and VT.

Regards,

Dante Garcia
LEED Green Associate


De: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] En nombre de Joe Huang
Enviado el: miércoles, 22 de mayo de 2013 12:27 p.m.
Para: equest-users at lists.onebuilding.org
Asunto: Re: [Equest-users] Diferents result with differents U-value in Weather 2A

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<mailto:yjhuang at whiteboxtechnologies.com>
http://weather.whiteboxtechnologies.com
http://www.whiteboxtechnologies.com
(o) (925)388-0265
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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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