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Check U-value of roof instance (element)

8 ANTWORTEN 8
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Nachricht 1 von 9
szymon.szewczyk
457 Aufrufe, 8 Antworten

Check U-value of roof instance (element)

Hello everyone, 

 

I'd like to check U-value of roof which consists of layers of defined materials. I've noticed that Revit calculates the U-value related to thermal conductivity correctly for regular partitions with even layers. 

 

However in the model there is a roof with a slope created by insulation. 

In a real scenario for preparing energy characteristics of a building I would calculate U-value using average thickness of each layer

 

To conclude - I'd like to know if there is possibility to see U-value computed by Revit for each instance like I can see computed volumes, areas. example below. 

szymonszewczyk_0-1704314445497.png

szymonszewczyk_1-1704314529148.pngszymonszewczyk_2-1704314537264.png

 

8 ANTWORTEN 8
Nachricht 2 von 9
GaryOrrMBI
als Antwort auf: szymon.szewczyk

A fairly simple formula in a schedule should give you a rough average thickness:

Volume divided by area = thickness

 

-G

 

Gary J. Orr
GaryOrrMBI (MBI Companies 2014-Current)
aka (past user names):
Gary_J_Orr (GOMO Stuff 2008-2014);
OrrG (Forum Studio 2005-2008);
Gary J. Orr (LHB Inc 2002-2005);
Orr, Gary J. (Gossen Livingston 1997-2002)
Nachricht 3 von 9
barthbradley
als Antwort auf: szymon.szewczyk

What about Calculated Values in a MTO Schedule? 

 

you can compute the "average" thickness via this formula: =(Material: Volume/1)/(Material: Area/1) 

 

Then pull this Calculated Value into another Calculated Parameter to compute U-Value.  

Nachricht 4 von 9
barthbradley
als Antwort auf: szymon.szewczyk

Actually, I don't know how that could be done. I don't think the "average" thickness will help you here in calculating the U-Value of the layer.  Frankly, I don't see how "average" thickness could be of any value here.  

 

Following...   

 

Nachricht 5 von 9
szymon.szewczyk
als Antwort auf: barthbradley

Hey, thank you for replies. I agree with you. 

Looking at pics from my original post it appears like Revit computes surface area, because both of those roofs have same dimensions in horizontal plane. So approach with volume/area wouldn't give true result. 

 

My main point is not about that thickness (it can be helpful for approximating U-value according to ISO 6846). Sorry for not making that clear in the post.

The question is about displaying U-value as an instance parameter, not as type parameter because in two of those roofs the insulation layer is of different thickness/shape so actual U-value should be smaller than the one displayed in type parameters.  

Nachricht 6 von 9
barthbradley
als Antwort auf: szymon.szewczyk

I'm not following. Instance vs. Type Property? Why would it matter?  The U-Value of a variable thickness roof -- if it can even be calculated, which I don't think it can -- would have to be calculated in a Revit Schedule via Calculated Parameters.   

Nachricht 7 von 9
szymon.szewczyk
als Antwort auf: barthbradley

thank you for explanation. To summ up it does matter, can be calculated manually and makes difference for heat loss calculation. 

It can be computed by Revit with couple of steps using schedule etc. 

 

 

Nachricht 8 von 9
barthbradley
als Antwort auf: szymon.szewczyk


@szymon.szewczyk wrote:

thank you for explanation. To summ up it does matter, can be calculated manually and makes difference for heat loss calculation. 

It can be computed by Revit with couple of steps using schedule etc. 

 

 


 

I asked what does it matter that the information come from an Instance Property. I'm not questioning the value of the information.  

Nachricht 9 von 9
szymon.szewczyk
als Antwort auf: barthbradley

Similarly to volume of 2 different roofs shown in first post, their U-value (for each instance) is different (due to different thickness of insulation), therefore in my opinion sould be accessed easily (e.g. in instance parameters). 

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