HVAC
HVAC Catalogue : Basic Features of the Catalogue
All HVAC components used in the design are selected from the Catalogue database by setting the Specification Reference for the corresponding design element so that it points to the required catalogue entry.
|
•
|
A Geometry Set, which defines the overall physical shape of the item in terms of a set of 3D basic shapes (known as primitives). A geometry set can include negative 3D primitives to represent holes.
|
|
•
|
A Point Set, which defines a number of reference points and directions superimposed on the geometric shape so that individual parts of that shape can be identified and manipulated. These reference points, each of which represents a 1D point position, are called p-points.
|
A range of catalogue components with similar overall geometry will all reference the same geometry set and point set, so that the amount of data needed to represent all possible items is kept to a minimum. The dimensions of the items are not fixed in the catalogue but are expressed in terms of Design parameters. dimensions are allocated to these parameterised dimensions when the item is used in a specific part of the design model: they may either be set explicitly or derived from associated dimensions of other design components to which the item is to be connected.
