Graphics Programs Reference
In-Depth Information
enter this value in either of the first two options to force Revit into
calculating the code-required ventilation rate.
A more accurate way to ensure that the correct ASHRAE Standard 62.1
(or other code) ventilation rate is modeled in the zone is to calculate the
required outdoor air per the appropriate ventilation rate procedure and
enter the result as shown previously.
Occupiable
When you are creating spaces to use for heating and cooling analysis,
make sure that the Occupiable check box is selected in the space
properties. This ensures that ventilation loads are computed as part of
the space load.
Setting Building Construction Options
You are ready to investigate the physical properties of your building's
exterior and interior constructions when all the spaces within your design
building are placed, the internal data is identified, and the spaces have been
grouped into zones, ready for the heating and cooling data to be analyzed.
These elements control how heat leaves or enters your design spaces to
or from the surrounding outdoor environment or adjacent spaces. Each
element has a specific coefficient of heat transfer, or
U-value
, that is
dependent on the element's material composition and assembly as well as
its thickness.
But the architect who created the building elements has already defined the
wall or roof construction. That data should already be loaded in with the
link, right? Well, no. Although the architectural model will have accurate
wall and roof constructions in the linked building, the U-values will not
transfer from the link, unless the building has been modeled directly in the
MEP project file. You have to define the building construction parameters.
This will set U-values for the elements that bound your design spaces,
allowing for heat transfer into and out of the spaces to be calculated and
accounted for.
To set the building construction U-values, open the Manage tab and click
Project Information, as shown in
Figure 8.8
.
