Defining Walls

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To define the walls, you will first need to insert break points into the walls of rooms that are both exterior and interior walls, for instance the north wall of the lobby. To insert a break point in a wall, go to

DM HVAC arrowBuilding Definition arrowWalls arrowInsert Wall Point

Design Master HVAC will prompt you to select the wall at the break point. Click on the north lobby wall where the outside wall of the conference room meets it. Design Master HVAC will insert a wall point at that location.

select_wall_at_breakpoint

To check that Design Master HVAC has inserted a wall point in the correct location, you may click on the wall to see the grip points. They should appear as shown below.

wall_points

Wall points need to be inserted everywhere an outside wall becomes an inside wall. These locations are on the west wall of the lobby where the wall meets office 103 and on the north wall of office 105 where the wall meets office 107. These locations, in addition to the one just completed, are shown in the drawing below.

hvac_load_outnin_walls

Once you have inserted the wall points, you are ready to define the exterior walls. To do this, go to

DM HVAC arrowBuilding Definition arrowWalls arrowQuery Wall

Design Master HVAC will prompt you to select a wall to query. Select an exterior wall, such as the east wall of Conference 102. The Specific Wall Information dialog box will appear as shown below. Set the specifications of the wall to match those shown below. The fields you will need to change are highlighted below in yellow. Note that when the dialog first opens, No Heat Transfer is chosen in the top left-hand corner and the other options are not available for editing. Thus, you must first select Heat Transfer and Solar Gain (Wall) before being allowed to set the remaining fields. Once the specifications match those shown below, press OK.

specific_ex_wall_info

Design Master HVAC will increase the width of the wall you queried. This thickness indicates that there is a heat transfer though the wall.

dwg_one_ex_wall_definted

To copy the wall properties from this wall to the other exterior walls, go to

DM HVAC arrowBuilding Definition arrowWalls arrowMatch Wall Properties

Design Master HVAC will prompt you to select a wall to use as the source. Select the east wall of the conference room (the thick wall as shown in drawing above). Design Master HVAC will next prompt you to select a wall to which to copy. This means to select the wall you wish to copy the wall properties to. Click on an exterior portion of the north wall of the lobby. The wall you select should increase in width to indicate that it has been changed from an interior partition with no heat transfer to an exterior wall with a heat transfer. Continue to select exterior portions of walls until the entire exterior of the building is defined. When you have finished, press ENTER to exit the command. Your drawing should match the one shown below.

dwg_ex_walls_defined

Next, you will edit the exterior wall of the conference room to include more glass. To edit a wall's properties, go to

DM HVAC arrowBuilding Definition arrowWalls arrowQuery Wall

Design Master HVAC will prompt you to select a wall to query. Select the exterior wall of Conference 102. The Specific Wall Information dialog box will appear as shown below. Set the specifications of the wall to match those shown below. The fields you will need to change are highlighted below in yellow. Once the specifications match those shown below, press OK.

edit_conf_ex_wall

You now have the rooms and walls defined. In order to complete specifying the inputs for the building load calculations, you must next set the project and zone information.


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