Re: [EnergyPlus_Support] Calculation of U-value

["jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>]

Firstly, my approach is to get the total assembly U-Value from the manufacturer and model my fenestration with the assembly u-value and no frame.

Secondly, if you can only get info on the individual parts of the assembly, then you may use either Window or E+ (which uses Window's calculations) to deturmine the NFRC rating. Another option is to use the extreamly conservative (huge) U-values from Table A8.2 for the total ass. U-value. If you don't have to model automated shading in the proposed case, then you could use the SimpleGlazing objects...else, it's a bit of trail and error.

Sent from my iPhone (excuse the brevity)

Mit freundlichen Grü�en

i. A.

Jean Marais

B.Eng (Mech)

LEED Accredited Professional

Building Energy Modeling with DesignBuilder and EnergyPlus

b.i.g. bechtold

INGENIEURGESELLSCHAFT MBH

KeithstraÃ?e 6

10787 Berlin

Tel.   +49 30 6706662-23

Fax  +49 30 6706662-18

Marais.Jean@xxxxxxxxxxxxxx

www.designbuilder-big.com

Official Reseller for DesignBuilder in Germany and Austria

 

On 27.06.2013, at 01:05, "billysonny1" <bscr_14@xxxxxxxxxxx> wrote:

 

Hello everyone,

I'm in the process of filling out the table 1.4 for LEED EAp2 submission, my question is about this ''How were the Proposed case framed assembly fenestration U-factors determined?'' along with the following options:

* NFRC testing for site-assembled fenestration
* NFRC testing for manufactured fenestration assemblies
* Table A8.2 (windows) and Table A8.1 (skylights)
* LBNL Window 5 or Window 6 calculations
* Energy simulation includes separate frame and glazing

Normally the U-value I have for the projects I'm working on, doesn't include framing, just the glazing (please confirm if this always happen in the technical sheet of the glazing).

Please help me figure out the meaning of the previos options and give me a big picture about how different would be considering the framing in relation to not considering it.

Thanks in advance.
Billy.

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