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When an External Wall is a Curtain wall

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Message 1 of 3
Foggo
711 Views, 2 Replies

When an External Wall is a Curtain wall

In Conceptual Mass Mode I have not been able to find an Mass External Wall Construction option that will create in Green Building Studio the External Wall defined as R9 Curtain wall/Spandrel. 

Nor has it been possible to select R9 Curtain wall/Spandrel as an alternative design option in GBS.

 

Upon reflection perhaps it would be better to simply have a way of changing U values by fixed steps in a drop down menu in the same way as the percentage glazing can be adjusted.

Having established a "U value" goal to aim at, it will then be up to the designer to come up with a wall / roof or glazing construction to meet this goal.

2 REPLIES 2
Message 2 of 3
mstein7484
in reply to: Foggo

Are you looking for R-9 insulation? Or an overall assembly u-value of 0.11?

 

Unfortunately a curtain wall with exactly R-9 insulation currently not available in Revit. And currently it is not possible to edit the thermal properties of curtain walls (you can do so with other analytical surfaces)

 

We have some curtain walls that are close to those settings in the Revit Analytical Constructions, assuming that is close enough to your desired setting.

Follow these steps to create a curtain wall from a Mass Model: http://help.autodesk.com/view/RVT/2015/ENU/?guid=GUID-62D7C2DF-9E9B-409B-B106-504387438E1C

Follow these stops (under “Building Construction” to specify Analytic Constructions http://help.autodesk.com/view/RVT/2015/ENU/?guid=GUID-0D7D6EB3-A575-4D83-8D95-E0520756E5D6

 

There is an R-10 insulation (assembly u-value 0.130) – the 2-in insulation selection.

Or an R-5 insulation (assembly u-value 0.113) – the 1 in insulation selection

In the GBS design alternatives there is a Translucent Wall Panel U 0.10, which is the same as the Revit Analytical Construction Curtain Wall 1-in insulation.

 

Your only other option would be to make edits to the eQUEST model using DOE-2 input file generated by the energy analysis (found in the GBS downloads pages for your selected run).

 

Plese let us know if help if additional clarification is needed, otherwise please accept as a solution so that others can benefit from this information

 .

 

Regards,



Marjorie Stein
QA Analyst
Generative Design Group
Autodesk, Inc.

insight.support@autodesk.com
Message 3 of 3
mstein7484
in reply to: Foggo

Hello Foggo,

Here are answers in response to your emailed questions.

 

Q1        What triggers the replacement of the generic (fairly international) External wall construction descriptions with the American ASHRAE 90.1 compliant materials? 

 

Answer:

If I’m understanding your question regarding ASHRAE 90.1, GBS automatically assigns most prescriptive components of ASHRAE 90.1 to your model when you export a mass model xml file from Revit & then directly upload that raw xml file, which contains no construction elements, to GBS. If you do your Energy Analysis directly from Revit a the generic set of construction & HVAC defaults are applied, and not ASHRAE 90.1 prescriptive values. 

 

 

Q2. I like the impressive Reports feature in Revit's Results and Compare Window. How can I edit Curtain Wall thermal values and still see the results of my edits in Revit Results and Compare.

 

Answer:

Unfortunately there currently is no easy workflow for editing Curtain Wall systems in Revit for use in Energy Analysis. One workaround is:

1. cover virtually the entire wall with a window(s), instead of applying a curtain wall system.

2. make edits to windows thermal properties of the window(s) in the xml file. It is easier to view the xml file using XML Notepad (see the screenshot below). Note that edits to the window thermal properties in Revit are only used for Lighting Analysis and not Energy Analysis. Currently you can’t edit a curtain wall’s thermal properties in the xml file.

3. Upload the edited xml file to directly to GBS via the GBS web pages

4. Follow the Solon feature workflow, which allows you to customize charts for various energy analysis results. Unfortunately you won’t be able to compare results side-by-side, but you will be able to customize your energy results charts and see those results in the Revit Results and Compare Window.

 

Question 3: eQUEST does not appear to use metric units.

 

Answer: Unfortunately the units in eQUEST are all in IP units.

 

Please contact us if you have more questions. If this answer is useful please accept it as a solution so it may benefit other forum members.




 

xml.PNG

 

Regards,

 

 

 

 



Marjorie Stein
QA Analyst
Generative Design Group
Autodesk, Inc.

insight.support@autodesk.com

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