We have seen many improvements by Autodesk wrt adding Energy Efficiency into Revit.
One thing that we already can use out of the box is to calculate the R-Values for walls, roof and floor requirement by SANS 10400-XA to comply. I’m not going to go into the requirement as set out by the SANS documents but in essence you will require a wall construction, for instance, to have a certain R-value for it to comply.
To explain the process I’ll use a 270mm cavity wall as example.
When we create a standard 270 Cavity wall within Revit as below, you also should notice that there is no Resistance (R) attached to the wall layers in this case. Our next step is to add the Thermal Property to the wall.
You can add a Thermal Asset a number of ways but since I have the Wall Type Properties open I’ll click inside the Material Cell.
Now within the Properties area click the + sign on the top right.
Then add the “Thermal” asset.
The “Asset Browser” will appear in which you can select a predefined asset. In this case I’ve browsed for the “Brick – Mediumweight” thermal asset. Once selected you can close the dialogue box.
The Thermal Asset “Brick- Mediumweight” is now attached to “Masonry-Brick” Material. Also note the property called Thermal Conductivity (or K value) in the Properties area which currently have a value of 0.54 W(m/K) . This value is the critical value of the material that is used. You can change this if you know the K value of the Brick material. You can find various sample K values here – http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html but you should speak to your brick supplier for the correct K-value of the brick used.
Now you can attach “Air” thermal asset to the “Air Barrier” material in the same way.
Now that you have attached Thermal Assets to all the layers you can see the R-Value has been updated in the Type properties of the wall. See below.
You can also create a Wall schedule and add the R-Value into the schedule as a Field.