Rectangular component requirements

This section describes the requirements for rectangular HVAC components, and covers components included in the AVEVA supplied rectangular AVEVA_RECT specification, included in the ACP project.

Note:
Assigned parameter numbers for specific parameters can be different for different components.

Data set requirements

Parameters must have Definition set to Parameter and No. set to the corresponding parameter number. This will automatically set Expression to PARA[No.] and the value cannot be changed. It is good practice to set Default to the same as Expression. The data Type must be set to the unit of the parameter. For example, in the following graphic, AARR and Distance.

P-point requirements

To be used in the Model module, all components and sub components must have a set of P-points with specific attributes and position data.

Inline components that only have an arrive and leave, for example straights, bends, and tapers, must have P-points P1 and P2 to define the arrive and leave position, size, and shape. Some inline components require additional P-points that are described in the requirement sections for each component type.

P-points for components can be used to position and control the geometry of a component.

The PDShape attribute needs to be set to RECT and the AllAngle attribute needs to be set to 180 for connecting P-points. These attributes cannot be set on the Model View form, they must be manually set on the Attributes form or the Command Window.

P1 property requirements

P1 defines the arrive connection point position, size, and shape.

Use the following guide and recommendations when defining P1 values:

• P1 can be any of any P-Point type, but PTAX is the simplest option.

• Connection Type (PCON) is the shape of the arrive (RECT)

• Bore (PBOR) must follow the convention of (RPRO AARR + RPRO BARR) regardless of the component shape.

• Axis Direction (PAXI) points away from the arrive point.

• PZ Axis (PZAXI) needs to be set to Y for all P-points that are used as connections, for example P1 and P2 for inline components, P1, P2 and P3 for threeways, and P3 for branch connectors.

• Point Width (PWID) must follow the convention of (RPRO AARR) for inline components.

• Point Height (PHEI) must follow the convention (RPRO BARR) for inline components.

• The Axis Direction (PAXI) for P1 must be set to -Z and the component geometry created to reflect this.

In most cases, P1 is set as shown in the following graphic:

P2 property requirements

P2 defines the leave connection point, size, and shape.

Use the following guide and recommendations when defining P2 values:

• P2 can be any of any P-Point type, but PTAX is the simplest option.

• Connection Type (PCON) is the shape of the arrive (RECT)

• Bore (PBOR) must follow the convention of (RPRO ALEA + RPRO BLEA) regardless of the component shape.

• PZ Axis (PZAXI) needs to be set to Y for all P-points that are used as connections, for example P1 and P2 for inline components, P1, P2 and P3 for threeways, and P3 for branch connectors.

• Point Width (PWID) must follow the convention of (RPRO ALEA) for inline components.

• Point Height (PHEI) must follow the convention (RPRO BLEA) for inline components.

• Distance (PDIS) must be set to RPRO LENG because it is controlled by the LENG DKEY.

• Axis Direction (PAXI) points away from the leave point (usually Z). For components where the leave is not on the same axis as the arrive, for example eccentric tapers and offsets, the P-point type can be PTMI or PTCA to account for the offset.

In most cases, P2 is set as shown in the following graphic:

Additional P-points for inline components

All inline components require P-points P61–P64. These are used by the HVAC application to control the placement of sub-components on parent components, and on implied ducting components from the arrive and leave. They are also used to control the rotation of bend components.

P61–P64 must be defined according to the following:

• The P-points must be on the same plane as the arrive P-point P1.

• The P-points must be positioned at the extents of the duct diameter, width, or depth.

The order of the P-points and PAXI setting do not affect how the components work, but it is good practice to be consistent when building the catalogue.

With P1 having a PAXI of -Z, P61–P64 will be on the X-Y plane, with a PAXI of Y, and the P-points arranged as shown in the following graphic:

In most cases, P61 for example, is set as shown in the following graphic: