Details on the Calculation Dialog for Gas
Information on the dialog LINEAR Analyse Gas Revit.
The calculation dialog shows an overview of the detected pipe network and contains all functions necessary for the calculation.
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Functions for the Calculation
The functions in the upper part of the calculation dialog pertain to the entire pipe network.
| Element | Meaning |
|---|---|
| Systems | If the project contains several systems or partial networks you may determine which of the systems or partial network to display in the calculation dialog’s tables. |
| ... | This button will open the technical data of the initial component. Here, you can change the system name shown in the drop-down list. |
 Calculate | Initiate the calculation of the pipe network after having made changes to see current calculation results. If you have selected the Recalculate after Editing checkbox in the Settings dialog, the calculation will be automatically rerun after each edit to sections or components. |
 Visualization ... | This function displays properties and calculation results of the pipe network in color in the model. |
 Results ... | Displays additional information regarding the pipe network and an overview of the calculation results, which also are part of the printouts. |
 Reports ... | Displays an overview of notes, warnings and errors that occurred during calculation. You can recognize the type of report by the color of the button: green check mark: No current notes, warnings or errors. blue i There are notes on the calculation. yellow warning triangle: There are warnings for the calculation. red cross: There are errors in the calculation. Note: It is recommended to always carefully read the reports to correct errors in the drawing and ensure a proper calculation. |
 Labeling ... | Label components and duct sections with calculation results. |
 Update < | If components or duct sections have already been labeled and calculation results have changed retrospectively, this button will refresh all labels with current data. |
Functions of the Tables
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Objects are displayed when selected from the lists in the project/model
Activated : The model highlights the objects that belong to the currently selected row in the table of Flow paths, Pipe Sections, or Components. If necessary, the image will be zoomed in to ensure that the objects are visible.
Deactivated : No objects in the model that belong to the currently selected row in the table for Flow Paths, Pipe Sections, or Components are highlighted.
Similar functions are available for Flow Paths, Sections, and Components.
| Element | Description |
|---|---|
|
Maximize/Minimize Flow Path List/Duct Section List/Ventilation Section Parts |
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 Search < | This function is available in the sections Flow Paths, Pipe/Duct Sections and Components. After clicking Search < select the element in the model. The respective table then highlights the flow path, the duct section or the component. If a certain flow path number, a duct section number or a component number needs to be found, enter the number into the text field and click Search <. The respective table then highlights the flow path, the duct section or the component. |
 Show | This function is available in sections Flow Paths, Pipe/Duct Sections and Components. First, select the element from the table and click Show. The flow path, the duct section or the component is shown in the model. |
 Edit ... | This function is available in sections Flow Paths, Duct Sections and Components. First select the element in the table and click Edit .... The dialog for editing the component or pipe/duct section opens. |
 Edit < | This function is available in sections Pipe Sections and Components. After clicking Search < select the element in the model. The dialog for editing the component or pipe/duct section opens. |
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Table for Flow paths
This table shows the calculation data for all flow paths of the selected system. It provides an overview over all ending components of the network. When you select a flow path, all associated pipe/duct sections are displayed in the Pipe/Duct Sections table. The most unfavorable flow path is highlighted in a different color. You can also select the most unfavorable flow path by pressing U.
| Column | Description |
|---|---|
| No. | Number of the flow path. |
| Appliance | Name of the consumer. The name can be modified in the table. |
| Q | Load by consumer. |
| Length | Length of the flow path. |
| Height | Height of the flow path. |
| ΔpZae | Pressure loss due to meters. |
| Δptot | Sum of all individual pressure losses from pipes, built-in parts, appliances, valves. |
| ΔpH | Pressure loss due to changes in hydrostatic pressure (Uplift). |
| ΔpKin | Pressure change due to acceleration (ÖVGW). |
| Δpstat | Static pressure change measured from the flow path beginning (Pressure regulating device) to the consumer. |
Table for Pipe Sections
By default, the table displays the calculation data for all pipe/duct sections included in the selected flow path. When maximized, all sections of the entire system are displayed. If you select a duct section, the table Components displays all corresponding components.
Unlock / Lock Pipe Sections
This function allows you to fix or unfix the dimensions of all pipe sections. If values are displayed in bold in theDN column, the dimension of the respective pipe sections will not be adjusted during the calculation. This is sensible when calculating existing systems. If the dimensions of some pipe sections have been fixed already, you will be asked whether to fix or unfix all pipe sections.
| Column | Description |
|---|---|
| No. | Number of the duct section. |
| Type | Pipe section type: DBP: Distribution pipe CSP: Consumption pipe BRP: Branch pipe SFP: Single feed pipe |
| pB | Working pressure (static pressure). |
| DN | Nominal diameter of pipes in this pipe section. The nominal diameter can be changed in the table. The value is then fixed and will not be adjusted by the software during calculation. Fixed values are shown in bold. |
| L | Length of pipe section. The length be changed in the table. The new length will be distributed among all ducts of the duct sections proportionately to constructed length. All pipes affected by the change in length will be displayed bold in the tables for duct sections and components. |
| H | Height of pipe section. |
| ∑Q | Sum- or section load. |
| Q | Peak load. |
| w | Velocity. |
| R | Pipe friction pressure loss per meter. |
| Ltot(L+L(equiv.) | Additional length of pipe section. |
| R*Ltot | Total pressure loss from pipe friction. |
| ΔpApp | Pressure loss from appliances. |
| Δptot | Sum of all individual pressure losses from pipes, built-in parts, appliances, valves. |
| ΔpH | Hydrostatic pressure change (Uplift). |
| Δpstat | Change in static pressure due to acceleration in the section. |
| ΔpResid | Residual pressure at the end of the pipe section. |
Table for Components
By default, the table displays the calculation data for all components included in the selected section. When maximized, all components of the entire system are displayed.
| Column | Description |
|---|---|
| No. | Component number. |
| Name | Name of the component. |
| DN | Dimension. |
| di1/di2 | Pipe inside diameter for pipes (ÖVGW). |
| L | Length for pipes. |
| R | R-value of pipes. |
| L(equiv.) | Length equivalent for fittings. |
| R*Ltot | Total pressure loss from pipe friction. |
| w1/w2 | Velocity relating to the pipe inside diameter d1/d2 (ÖVGW). |
| Re | Reynolds number (ÖVGW). |
| ∑ζ | Sum of resistance coefficients (ÖVGW). |
| ΔpR,F | Pressure loss from pipes and fittings (ÖVGW). |
| ΔpApp | Pressure loss from appliances. |
| Δptot | Total pressure loss. |
Adjusting Nominal Diameters
If calculated nominal diameters deviate from those constructed, calculated nominal diameters can be transferred into the model. You can adjust the nominal diameters for the entire network or for partial networks.