You next want to create a side branch which runs from a start point on the main branch and which passes between the tile positions. You will then add two more side branches, each running from a point on the first side branch to the tile positions (remember that you need a separate branch for each length of ducting between two points).
You will complete the ducting network by adding a fourth side branch, leading to an angled outlet mesh, from the unconnected arm of the square three-way component.
To start with, you must insert a suitable connector into the main branch so that you have a point to which you can connect the side branch head.
Exercise continues:
• Navigate to the existing three-way item. You will insert another branch connector immediately after it in the branch sequence.
• If you unpinned it earlier, re-display the HVAC form by hovering over the
HVAC tab.
• Use the HVAC form to create the next component:
From Categories, select Branch Connectors.
From Available Types, select Flat Oval ‘A’ Boot. set Boot Width to 610
set Boot Depth to 152 set B Offset to 100 Set Boot Direction to E.
Doc No: 9100-02-22-110-A4-Rev0 Page 112 of 165 You want the oval ducting to pass along the centerline of the ceiling, so position the current component so that its outlet is aligned with the SOP datum at the ceiling’s centre.
(Using the Through ID Element facility on the HVAC form): • In the HVAC form:
• From Categories, select PDMS Branches
• From Available Types, select Side Branch (off main). • From the HVAC Side Branch Element (Connected to ‘Main’) form:
• Set Branch Name to HTESTB1.1 (showing that it is a side branch of main branch HTESTB1)
• Set Insulation Thickness to 50 mm
• Leave Specification set to the current default (the same specification as the main branch)
• Because you are creating a side branch, it is assumed that you will connect its head to a free P3 point on an existing component. Set Connect Head to Branch Connector to show the type of component to which this connection is made.
Doc No: 9100-02-22-110-A4-Rev0 Page 113 of 165
Note: You can pick any part of the component; the new branch head will
always be connected to its P3 point.)
• Create a Flat Oval Straight as the first member of the new side branch.
Set its Width Direction to N.
You are now going to create two circular boot connectors from which to route outlets to the two tile positions. You will create these and position them before you create the straight to which they are connected, so that the boots can be positioned relative to the tiles and the length of the straight can then be adjusted to suit the boot positions.
• Make the oval straight as current element. • In the HVAC form:
• From Categories, select Branch Connectors • From Available Types, select Circular Boot • set Boot Diameter to 150
• set Inner Extension to 76 • set Dist from Leave to 100 • leave Boot Direction set to N.
This boot is positioned 100 mm back from the PL of the straight on which it is mounted (which is only implied at this stage).
• Move the boot so that it is aligned through the northernmost tile (shown as in the diagrams).
• Create a second circular boot as follows:
• From Categories, select Branch Connectors • From Available Types, select Circular Boot • set Boot Diameter to 150
• set Inner Extension to 76 • set Dist from Leave to 700 • set Boot Direction to S.
Doc No: 9100-02-22-110-A4-Rev0 Page 114 of 165 PL of the previous boot. Since the previous boot was set back 100 mm from its PL, the difference between the boot positions corresponds to the 600 mm offset between the two tile positions. The result is as follows:
You can now replace the implied ducting between the circular boots with a straight component. Because the boots are subcomponents, you must first navigate back to the existing straight in this side branch.
• Navigate back two positions (to STRT1 in HTESTB1.1) in the Design Explorer.
• Create a second Flat Oval Straight, and use the Fit button to achieve the required length between the PL of the first straight and the PL of each circular boot.
The calculated Length is 2525.
• To complete this first side branch, add a cap to close the end of the last straight; navigate to the last component of HTESTB1.1 in the Design Explorer (the southernmost circular boot) and create a Flat Oval Cap End.
Doc No: 9100-02-22-110-A4-Rev0 Page 115 of 165 (Remember that the PL of this boot is as shown in the above diagram, and not within the boot volume itself, so that the cap should be positioned correctly and appear in the correct list order.)
• Connect the HVAC Branch Tail to the Last Member of the branch (the cap).
Your second side branch will run from the northernmost circular boot to a grille in the adjacent tile.
• Navigate to the first side branch (HTESTB1.1) and create a new side branch named HTESTB1.1.1 with 50 mm insulation thickness. Connect the head of the new side branch to the circular boot connector. • Create a Circular Straight with Length set to 750.
To see what types of leave joint are available, click the Choose button next to the Lea joint field. From the resulting Choose Joint form, select Male Socket & Spigot Joint and click OK. The Lea joint field is updated to show MALE.
• Create a Circular Internal Damper with default settings.
• Create a Circular Flexible Bend with its Leave Direction set to D (down). Position the bend so that it is aligned through the appropriate tile.
(You will adjust the dimensions of this bend later in the exercise.) • Use the HVAC form to create a circular to rectangular spigot box:
• From Categories, select Transformations
• From Available Types, choose a circular to rectangular spigot box by selecting Spigot Box.
Set the following parameters:
• duct width LA = 300 • duct depth LB = 300
• Rectangular Box Height = 75 • Circ Extension = 50
Doc No: 9100-02-22-110-A4-Rev0 Page 116 of 165 • From the Inline Plant Equipment category, create a
Rectangular Grille in line. Set the parameters as follows: • Name = GRIL1
• End width = 400 • End depth = 400 • Grille Length = 50 • ‘A’ Extension = 0.
You want the grille to fit within the tile volume, so set the Position At option button on the HVAC form to ID Element and, when prompted, pick the tile. The origin of the grille is positioned at the origin of the tile.
Note: At this stage the PL of the spigot box and the PA of the grille have
become misaligned, so you see a broken line between them rather than a length of implied ducting.)
Having positioned the grille correctly, you will now go back along the current side branch and adjust the other components to fit, starting with the spigot box, which you will position directly on top of the grille
• Navigate to the spigot box (PLEN 1 in the Design Explorer).
• Select Position At Next from the HVAC form positioning options. • Navigate to the flexible bend and click the Modify CE button on the
HVAC form so that you can adjust the dimensions of the flexible bend
so that it fits correctly between the internal damper (at its PA) and the spigot box (at its PL).
• Click the Fit button on the Circular Flexible Bend form to recalculate the dimensions necessary for a correct fit. (The calculated Arrive Extension becomes 120 and the Leave Extension 225.)
• Complete the definition of the side branch by connecting its tail to the grille.
Looking towards the west, the side branch HTESTB1.1.1 now looks like this:
Doc No: 9100-02-22-110-A4-Rev0 Page 117 of 165 • Use the method given above to create a similar side branch, named HTESTB1.1.2, from the second circular boot to a grille (GRIL2) positioned in the other tile. (Remember to navigate up to the level of branch HTESTB1.1 first.)
The overall layout of the HVAC ducting in the vicinity of the room now looks like this (the different shades in this diagram show the branch hierarchy):
You can now complete the network by connecting an angled outlet grille to the side arm of the square three-way component (top left in the preceding diagram).
To do so, you must create a fourth side branch. • Navigate to the three-way connector.
Doc No: 9100-02-22-110-A4-Rev0 Page 118 of 165 • Create a side branch named HTESTB1.2 with insulation
thickness 50mm. Set the Connect Head to option button on the HVAC Side Branch Element form to Threeway Item and, when prompted, pick the three-way component.
• Create a Rectangular Radiused Bend.
• Because you want the bend to turn in the B direction (click the Picture button for clarification), click the Transpose width/depth button. The Duct width AA becomes 500 and the Duct depth AB becomes 800.
• Set the Angle to 135, the Inside Radius to 100, and the Leave Direction to D.
• Create a Rectangular Radiused Splitter which fits inside the bend (it is a subcomponent of the bend). Set the Splitter Radius to 200. If you are using a colour-shaded view, switch to wireline mode (Graphics>Shaded or F8 key) to see the splitter.
• Create a Rectangular Mesh End, using default settings, to complete the branch. Connect the branch tail to the last member in the usual way.
To complete the network, you will insert two sets of air turning vanes into the square three-way component to control the air flows (similar to those which you saw in the square bend).
Doc No: 9100-02-22-110-A4-Rev0 Page 119 of 165 • Navigate to the square three-way component and switch to
wireline view (if not already set) so that you can see what happens next.
• Create the first set of Rectangular Turning Vanes. Change the Duct Width AA to 500 and leave the other settings at their defaults. Note in particular that the Leave Throat is 150 and that the Direction towards leave radio button is selected. • Create a second set of Rectangular Turning Vanes. This
time set the Duct Width AA to 500, the Leave Throat to 650 and select the Direction opposite leave option button.
The results, and the significance of the settings used, are illustrated in the following diagram:
This completes the conceptual design of the basic HVAC network. In the next chapter you look at some ways in which you can enhance this design further.
Doc No: 9100-02-22-110-A4-Rev0 Page 120 of 165