The geometry defined by the Bounding Elements in the Revit Physical Model, in conjunction with the Volumes they define, make up a critical piece to accurate BPA. Without the proper metadata to define the conditions in those Volumes, one must make a lot of assumptions to produce BPA results. Like I spoke about in my last post, this metadata is the "fuel" that gets fed into our BPA capabilities.
In Revit MEP 2009, we define that information in 3 places:
- Project Information
- HVAC Zone Elements
- Space Elements
We covered the Project Information in my past post, today we're going to cover the fuel that exists on the HVAC Zone and Space Elements.
It's important to note that while this information exists on these elements, that information can be authored:
- In the Heating & Cooling Loads dialog: In this dialog you can
multi-select Spaces or Zones, and author the information for all
- On the Elements themselves: In a view you can select individual
elements or multi-select elements and then author this data from the
Element Properties dialog.
- In a Schedule: Much of the information can be scheduled in a Zone or Space schedule, and then be authored there.
Just like many other things in Revit, you have access to that same data
in many interfaces, and a change in one location updates the core
definition of that data. That means that all locations update
With the release of Revit MEP 2009, we've completed two different categories of improvements to the metadata that exists on HVAC Zone and Space Elements.
- Additional "Overrides" of Space Assumptions - We make a lot of determinations for the environmental conditions based upon the Building Type/Space Type that's defined in the Revit Project. We have allowed for explicit control over additional environmental conditions in Revit MEP 2009. This will allow you to override the Building Type/Space Type assumptions if desired.
For example, the Outside Air (AKA fresh air) quantities can now be explicitly defined by the user on the HVAC Zone, rather than be defined by the Builging Type/Space Type assumptions.
- Location of Metadata - The introduction of the HVAC Zone element creates a more logical location for some of our metadata than the Space Element, so we've moved some metadata to these more logical places.
Now let's cover this information in detail in a video.
Next we're going to put this all to work and discuss using the Heating & Cooling Loads dialog to calculate the peak loads for our Revit projects.