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# Modeling Mechanical Systems

BIM for Architecture, Engineering, and Construction Curriculum

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# Exercise 4.5.1: Copying Shared Elements into a Mechanical Model

 In this exercise, students will learn how to: Copy shared levels and grids into a Revit MEP host project. Create working views for mechanical design in Revit MEP. Figure 4.5.1 - Applying view templates to customize views for mechanical design

## Student Exercise

Download Unit4_Lesson5_Exercise1_Start.zip: Imperial or Metric
Revit
• Create a new customized and filtered 3D view using the section box to assist with coordinating the lighting fixtures and the mechanical equipment to be placed.

Figure 4.5.2 - 3D view displaying lighting and HVAC disciplines

# Exercise 4.5.2: Modeling Exposed HVAC Systems

 In this exercise, students will learn how to: Place air handling units and terminals. Create a return system. View HVAC systems in the System Browser. Figure 4.5.3 - Connecting diffusers to an air handling unit

## Student Exercise

Download Unit4_Lesson5_Exercise2_Start.zip: Imperial or Metric
Revit
• Place six supply diffusers for an exposed HVAC system in the retail space at the north end of level 1 around the front façade.
• Create a supply system for the diffusers placed in the previous step:
• For the main ducts, use oval ducts with gored elbows/tapsand an offset of 13'-0" (3.96 m).
• For the branch ducts, use round ducts with tees, an offset of 13'-0"(3.96 m), and round flex ductswithmaximum flex duct length of 6'-0"(1.83 m).

Figure 4.5.4 -  HVAC supply system in the retail space

# Exercise 4.5.3: Modeling Closed Plenum HVAC Systems

 In this exercise, students will learn how to: Measure the plenum space available. Place air handling units and terminals. Create a supply system. Figure 4.5.5 - Using auto-routing to place supply side ducts in closed plenum HVAC system

## Student Exercise

Download Unit4_Lesson5_Exercise3_Start.zip: Imperial or Metric
Revit
• Open the model for this exercise in Revit MEP software.
• Place two supply diffusers for a closed plenum HVAC system in the office space at the northeast corner of level 2.
• Place a variable air volume (VAV) unit above the corridor outside the office.
• Create a supply system for the diffusers and VAV unit placed in the previous steps using the Generate Layout tool:
• For the main ducts, use rectangular ducts with mitered elbows/teeswith an offset: 11'-0" (3.35 m).
• For the branch ducts, use rectangular ducts with mitered elbows/teeswith an offset: 11'-0" (3.35 m) and no flex duct.
• Open the 3D HVAC Lighting Coordination view to confirm that there are no conflicts between the HVAC elements and the lighting fixtures.

Figure 4.5.6 -  Duct layout for supply side of closed plenum HVAC system