Details on the Heating and Cooling Calculation Dialog
Information about the LINEAR Analyse Heating and LINEAR Analyse Cooling dialogs.
The calculation dialog shows an overview of the detected pipe network and contains all commands necessary for the calculation.
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Applies to: Heating and Cooling.
Commands for the Calculation
The commands 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. |
 Visualization ... | Opens the Visualization dialog, where you can display the properties and calculation results of the pipe network in color in the model. |
 Results ... | Opens the Results - [System Name] dialog, which provides a compact overview of plant information and calculation results. The overview can be saved as a text file. |
 Reports ... | Opens the Reports dialog, which displays an overview of notes, warnings, and errors that occurred during the 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: Read all report messages carefully and thoroughly in order to efficiently correct any errors and ensure that the pipe network is calculated correctly. |
 Basic Conditions ... | Opens the dialog Basic Conditions, which allows you to change basic calculation-parameters like specifications for hydraulic balancing, upper limits for max. velocities, max. pipe friction pressure gradient as well as settings for the dimensioning of thermostatic valves, regulating valves and differential pressure closed-loop controllers. |
 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 update all labels with current data. |
Commands for the Tables
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Objects are displayed when selected from the lists in the project/model
Activated : The drawing 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 drawing that belong to the currently selected row in the table for Flow Paths, Pipe Sections, or Components are highlighted.
Similar commands are available in the sections Flow Paths, Pipe Sections and Components.
| Element | Description |
|---|---|
 ,  Maximize/minimize flow path list/pipe/duct section list/component list |
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 Search < | The command is available in the Flow Paths, Pipe Sections and Components sections. After clicking Search < select the element in the drawing. The respective table then highlights the flow path, the pipe section or the component. If a certain flow path number, a pipe 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 pipe section or the component. |
 Show | The command is available in the Flow Paths, Pipe Sections and Components sections. First, select the element from the table and click Show. The flow path, the pipe section or the component is shown in the drawing. |
 Edit ... | The command is available in the Flow Paths, Pipe Sections and Components sections. First select the element in the table and click Edit .... The dialog for editing the component or pipe/duct section opens. |
 Edit < | The command is available in the Pipe Section, and Components sections. After clicking the button, select the element in the drawing. The dialog for editing the component or pipe/duct section opens. |
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. If you select a flow path, the table Pipe Sections displays all corresponding pipe sections. The most unfavorable flow path is highlighted in a different color. You can also select the most unfavorable flow path by pressing U.
Pressure Loss
Opens the dialog Flow Path Data in which pressure losses over the course of a flow path are shown in a graph.
| Column | Description |
|---|---|
| No. | Flow Path Number. |
| Name | Name of the heating or cooling consumer. |
| L | Length of the flow path. Changes for length in the tables pipe/duct sections and components take effect after the next calculation. |
| m | Mass flow rate of the heat- or chill consumer. The tooltip shows the component number and the power output of the consumer. |
| ΔpPipe | Pressure loss due to pipe friction. |
| ΔpFit | Pressure loss due to fittings (e. g. bends, t-pieces, reducing parts, transitions, manifolds). |
| ΔpArm | Pressure loss due to valves from Kv value (e. g. fixed resistors, shut-off valve). |
| ΔpKonst | Constant pressure losses due to manually entered values (e. g. for radiators, heat exchanger). |
| ΔpRule | Pressure loss through three-port control valves. |
| ΔpDross | Pressure loss due to throttling valves (e. g. throttle valve, regulating valves). |
| Δptot | Pressure loss for the entire flow path. |
| ΔpPmp | Total pressure loss in flow path overcome by the pump. The tooltip displays the number of pumps. |
Table for Pipe Sections
By default, the table displays the calculation data for all pipe sections included in the selected flow 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.
In pipes, material changes can be inserted or components can be classified as pipe/duct section separators.
This function allows you to classify fittings or built-in parts in the pipe network as separating elements for pipe sections, e.g. in order to assign a different pipe material or to create clear separations for the automatic assignment of material.
Apply Pipe Section Data Globally
Opens the dialog Define Pipe Sections. Use this command to assign multiple properties to several or all pipe/duct sections at once, or to reset those properties.
Unlock / Lock Pipe Sections
Opens the Lock/Unlock Pipe/Duct Sections dialog, where you can lock or unlock dimensions, maximum velocities, and R values, as well as the simultaneity of pipe/duct 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 | HSW: Supply Water HRW: Return Water SWHC: Supply Water Heating/Cooling RWHC: Return Water Heating/Cooling |
| 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. |
| Q | Heat flow rate of this pipe/duct section. The tooltip shows the simultaneity and the resulting heat flow rate. |
| m | Mass flow rate in this pipe/duct section. The tooltip shows the simultaneity and the resulting heat flow rate. |
| 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. |
| T | Design operating temperature. The tooltip shows the operating temperature, the ambient temperature and the specific heat loss. |
| w | Mean flow velocity in this pipe/duct section. |
| R | R-value in pipes. |
| ΔpR | Pressure loss due to pipe friction. |
| ∑ζ | Sum of zeta values in this pipe section. |
| ΔpZ | Pressure loss due to zeta value. |
| ΔpA | Pressure losses of adjustable appliances and valves. |
| Δptot | Sum pressure loss of this 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. |
| m | Mass flow rate of this component. |
| L | For pipes: Length. The length be changed in the table. The new length will be used in all pipe sections containing the respective pipe. All pipes affected by the change in length will be displayed bold in the tables for duct sections and components. |
| DN | Dimension. VAR: Dimension varies. |
| ζ | Zeta value of component. |
| ΔpZ | Pressure loss of this built-in part. |
| Kv | Flow coefficient. |
| ΔpKv | Pressure loss due to Kv value. |
| ΔpPipe | Pressure loss of this pipe. |
| ΔpA | Pressure loss by appliances. |
| Δptot | Total pressure loss of this component. |
Generate 3D Pipes
Allows the assignment of pipe materials from the 3D Piping module after the calculation of a single-line pipe - network. After successful assignment, a three-dimensional pipe network is generated. Pre-assigned insulation material is considered. This process requires a license for the LINEAR 3D Design Pipe&Power module.
Make a backup copy of your drawing before having the 1-line pipe network converted to 3D.
The result of 3D generation may vary depending on which pipe material was chosen. It may occur that calculated nominal pipe sizes are not available for the selected 3D pipe material. This can lead to deviating results or open ends when calculating the 3D pipe network.