Numbering Scheme in Sizing

When a valid route is loaded in the Sizing utility, the summary table populates the system data. The system internally assigns unique identification numbers to every duct or pipe sections and fitting elements within a section. The section numbering is the determined in order of the flow. The next consecutive section number is incremented by 1. The numbering follows internal scheme logical in the direction of flow. .

The following description is written in context of Duct System.

The Number of Sections indicate the number of duct sections in the currently loaded HVAC System routes.

System upon loading navigates the list of route paths and group components to Duct/Pipe Sections. These sections are tabled in the order of longest route path duct sections to shortest route path duct sections as the sections are divided. Sections are listed in three sub-groupings of components; in case of HVAC route: Duct, Fittings, and Openings (Terminals), and in case of Piping route: Pipe, Fittings, and Fixtures (the end fittings). Fittings are numbered for use with the sub-tables in respective sections: in Fitting Loss Coefficient in case of HVAC, and Component Loss Coefficient in case of piping. For the Fittings category, the component that caused a change in say, in duct section (change in flow, size, or shape) is listed.

When sorted Group By: Duct Section, the Duct Section column sorts the duct components within the section and summarises pressure loss values for each duct section. Clicking in the Duct Section column heading toggles the order of rows.
When sorted Group By: Duct Element, the Duct Element column groups the components within the duct category. Clicking in the Duct Element column heading toggles the order of rows.

Clicking in either Duct Section or Duct Element cell highlights the corresponding duct section component in the geometry. The arrow in the leftmost column indicates currently selected duct section.

The duct elements within a duct section are identified by per their parent section number. The entire duct elements correspond to duct fittings and are numbered in sequence. These fittings are mapped with ASHRAE Fitting No., as detailed in Fitting Loss Coefficient Summary dialog.

The similar numbering scheme applies to Pipe Section, and Piping Element, in pipe system.