Graphics Programs Reference
In-Depth Information
A second way to create a zone is to select all the spaces you want to be in a
zone, and then select the Zone tool on the Analyze tab. Creating a zone this
way automatically groups the selected spaces without having to select each
space individually with the tool active.
When selecting a zone displayed in an open view, the zone data appears
in the Properties palette. From there, you are able to view the calculated
heating and cooling loads and zone airflow (after heating and cooling
analysis has been run), the physical data of the zone (area, volume, and
perimeter), and its characteristic data, which include the following:
Service Type
This drop-down allows you to select the type of system
that will be serving the spaces within the zone. Revit MEP offers a
variety of service type options based on four main groups of systems:
Constant Volume, Variable Air Volume (VAV), Hydronic, and Other.
Revit MEP automatically defaults to the service type that is selected in
the Project Energy Settings window. See Chapter 2, “Creating an
Effective Project Template,” for information on how to establish project
settings.
Coil Bypass
This is where you input the manufacturer's coil bypass
factor for the unit serving the zone. This value indicates the volume of
air that passes through the coil, unaffected by the coil temperature.
Cooling Information
This button allows you to set the zone cooling
set point, coil-leaving air temperature, and zone humidity control.
Heating Information
This button allows you to set the zone heating
set point, coil-leaving air temperature, and zone humidity control
during heating.
OutdoorAir Information
This button allows you to input the ventilation loads for the zone:
Outdoor Air Per Person, Outdoor Air Per Area, and Air Changes Per
Hour. You may specify individual Outdoor Air options or enter a value
in all three options. Revit MEP calculates heating and cooling loads with
only the largest calculated outdoor airflow, not a combination of the
three values. To obtain the required combined breathing-zone
ventilation rate as defined in ASHRAE Standard 62.1, add the
ventilation in cubic feet per minute (CFM) needed per occupant to the
CFM required per area and divide the result by the zone area. Then
