Exercise 1 - Creating the HVAC Main Branch
6 Adding to the HVAC Model
6.2 Creating Side Branches
A side branch which runs from a start point on the main branch and which passes through the tile positions will be created. Two further side branches will be added, each running from a point on the first side branch to the tile positions. First a suitable connector must be inserted into the main branch so there is a point to which the side branch can be connected.
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A separate branch is required for each length of ducting between two points.Exercise continues
92. Navigate to the existing three way item. Another branch connector will be inserted immediately after it in branch sequence.
93. Use the HVAC form to create the next component. From Categories, select Branch Connectors. From the displayed HVAC Branch Connectors form select Flat Oval ‘A’
Boot.
In the displayed Oval ‘A’ Boot Brco form:
Set Boot Width to 610.
Set Boot Depth to 152.
Set B Offset to 100.
Set Boot Direction to E.
94. Click OK.
The oval ducting is to pass along the centreline of the ceiling. As such, the boot must be positioned so that the outlet is aligned with the SOP datum at the ceiling centre.
Using Through ID Element on the HVAC form:
95. In the HVAC form:
From Categories, select HVAC / Branches.
From Available Types. Select Side Branch (off main).
96. From the HVAC Side Branch form:
Set Branch Name to HTESTB1.1.
Set Insulation Thickness to 50mm.
Leave specification set to the current default.
Set Connect Head to Branch Connector.
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97. A prompt will be displayed Identify Branch Connector. Pick the branch connector.
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Any part of the component can be picked, the new branch head will always be connected to the P3 point.98. In the HVAC form:
From categories, select Flat Oval.
From the displayed HVAC Flat Oval Ductwork form select Straight.
99. From the displayed Oval Straight form.
Set the Width Direction to N.
100. Click OK.
Two circular boot connectors are now going to be created, from which to route outlets to the two tile positions. These will be created and positioned before the straight is created to which they connect, so that the boots can be positioned relative to the tiles and the length of straight can be adjusted to suit the boot positions.
101. Make the oval straight the current element.
102. In the HVAC form:
From Categories, select Branch Connectors.
From the displayed HVAC Branch Connectors form select Circular Boot Branch.
In the displayed Boot Brconnector form:
Set Boot Diameter to 150.
Set Inner Extension to 76.
Set Dist from Leave to 100.
Leave Boot Direction set to N.
The boot is positioned 100mm back from the PL of the straight on which it is mounted (which is only implied at this stage).
103. Move the boot so that it is aligned through the northernmost tile shown in the diagram above using Position Through ID Element from the HVAC form.
104. Create a second circular boot.
From Categories, select Branch Connectors.
From the displayed HVAC Branch Connectors form select Circular Boot Branch.
In the displayed Boot Brconnector form:
Set Boot Diameter to 150.
Set Inner Extension to 76.
Set Dist from Leave to 700.
Set Boot Direction to S.
The Dist from Leave dimension positions the boot 700mm back from the PL of the previous boot. Since the previous boot was set back 100mm from the PL, the difference between the boot positions corresponds to the 600mm offset between the tile positions. The result is as shown.
The implied ducting between the circular boots can now be replaced with a straight component.
Because the boots are sub components, navigate back to the existing straight in this side branch.
105. Navigate back two positions (to STRT1 in HTESTB1.1) in the Design Explorer.
106. In the HVAC form:
From categories, select Flat Oval.
From the displayed HVAC Flat Oval Ductwork form select Straight.
Click the FIT button to achieve the required length between the PL of the first straight and the PL of the circular boot.
Click OK.
The calculated length is 2375mm.
107. To complete this first side branch, add a cap to the closed 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.
108. In the HVAC form:
From categories, select Flat Oval.
From the displayed HVAC Flat Oval Ductwork form select Cap End.
Click OK on the displayed Flat Oval Cap End form.
109. Connect the HVAC branch Tail to the Last Member of the branch (the cap).
Select Tail from the HVAC Connect menu at the foot of the HVAC form.
Select Last member.
The second side branch will run from the northernmost circular boot to a grille in the adjacent tile.
110. In the HVAC form:
From Categories, select PDMS Branches.
From Available Types. Select Side Branch (off main).
111. From the HVAC Side Branch form:
Set Branch Name to HTESTB1.1.1.
Set Insulation Thickness to 50mm.
Leave specification set to the current default.
Set Connect Head to Branch Connector.
Click OK.
112. A prompt will be displayed Identify Branch Connector. Pick the branch connector.
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Any part of the component can be picked, the new branch head will always be connected to the P3 point.113. Create a Circular Straight with Length set to 750.
114. In the HVAC form:
From categories, select Circular.
From the displayed HVAC Circular Ductwork form select Straight.
115. From the displayed Circular Straight form.
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To see what types of leave joint are available, click the Choose button next to the Leajoint field.
From the resulting Choose Joint form, select Male Socket & Spigot Joint.
Click OK on the Choose Joint form.
The Leajoint field is updated to show MALE.
Click OK on the Circular Straight form.
116. Create a Circular Internal Damper with default settings. The Circular Internal Damper is created 150mm from the leave end of the straight.
117. In the HVAC form:
From categories, select Circular.
From the displayed HVAC Circular Ductwork form.
select Internal Damper.
Leave the default values.
Click OK.
118. Create a Circular Flexible Bend.
119. In the HVAC form:
From categories, select Circular.
From the displayed HVAC Circular Ductwork form, select Flexible Bend.
Set the Leave Direction to D.
Click OK.
Position the bend so that it is aligned through the appropriate tile. (the bend dimensions will be adjusted later).
120. Move the flexible bend so that it is aligned through the northernmost tile using Position Through ID Element from the HVAC form.
121. Use the HVAC form to create a circular to rectangular spigot box.
From Categories, select Transformations.
From the displayed HVAC shape transformation items, select Spigot box.
In the displayed Spigot Box form.
Set Duct width LA = 300.
122. Use the HVAC form to create a Rectangular Grille in line.
From Categories, select Inline Plant Equipment.
From the displayed HVAC Inline Plant Equipment form, select Rectangular grille in Line.
In the displayed In line grille form.
Set Name = GRIL1.
The grille is to fit within the tile volume.
123. In the HVAC form:
Set the Position At option to ID Element.
A prompt will be displayed Identify Element.
Pick the tile, the origin of the grille will be positioned at the origin of the tile.
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At this stage the PL of the spigot box and the PA of the grille have become misaligned, as such a broken line is displayed between them rather than a length of implied ducting.Having positioned the grille correctly, go back along the current side branch and adjust the other components to fit, starting with the spigot box, which will be positioned directly on top of the grille.
124. Navigate to the spigot box (PLEN 1 in the Design Explorer).
125. Select Position At Next from the HVAC form positioning options.
126. Navigate to the flexible bend and from the HVAC form Select Modify CE 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).
127. Click the Fit button on the displayed circular Flexible Bend form to recalculate the dimensions necessary for a correct fit.
128. Click Apply and then Click Dismiss.
129. Complete the definition of the side branch by connecting the tail to the grille.
The side branch HTESTB1.1.1 is now as shown in the diagram below.
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 the branch HTESTB1.1 first.
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The overall layout of the HVAC ducting in the vicinity of the room will be as shown in the diagram below.
130. The network will now be completed by connecting an angled outlet grille to the side arm of the square three way component (bottom left in the preceding view). A fourth side branch must be created.
131. Navigate to the three way component.
132. In the HVAC form:
From Categories, select HVAC / Branches.
From Available Types. Select Side Branch (off main).
133. From the HVAC Side Branch form:
Set Branch Name to HTESTB1.2.
Set Insulation Thickness to 50mm.
Leave specification set to the current default.
Set Connect Head to Threeway Item.
Click OK.
134. Create a Rectangular Radiused Bend.
135. In the HVAC form:
From categories select Rectangular.
From the displayed HVAC rectangular ductwork form select Radiused Bend.
The bend is to turn in the B direction (click the Picture button for clarification). In the displayed radius bend form:
Click the transpose width/depth button.
Set the Angle to 135.
Set the Inside Radius to 100.
Set the Leave Direction to D.
Click OK.
136. Create a Rectangular Radiused Splitter which fits inside the bend (it is a sub component of the bend).
137. In the HVAC form:
From categories, select Rectangular.
From the displayed HVAC rectangular ductwork form select Radius Splitter.
In the displayed radius splitter form:
Set Splitter Radius to 200.
Click OK.
Switch to wireline mode (Graphics>shaded or the F8 key) to view the splitter.
138. Create a Rectangular Mesh End using default settings, to complete the branch.
139. In the HVAC form:
From categories, select Rectangular.
From the displayed HVAC rectangular ductwork form select Mesh End.
Click OK.
140. Connect the branch tail to the last member in the usual way.
This side branch is now as shown in the diagram below.
This completes the conceptual design of the basic HVAC network.
The next chapter will consider some of the ways in which the basic design can be further enhanced.