Home
Appendix
Dialogues and additional information
Simulation
The simulation is divided into a circulation simulation for hot and cold water and a simulation of a cold water hygiene system.
Circulation simulation
Basics of circulation simulation
Circulation simulation messages
Various messages can occur in the messages during the simulation, which are explained below.

Appendix
- Dialogues and additional information
  - Wastewater lifting unit
  - Design options (waste water)
    Drawing-specific settings relating to your calculation are set in the Design options dialogue.
  - Design options (heating)
    Drawing-specific settings relating to your calculation are set in the Design options dialogue.
  - Design options (drinking water)
    Drawing-specific settings relating to your calculation are set in the Design options dialogue.
  - Construction stages
    You can divide a drawing into construction stages so that you can later create a material extract according to construction stages.
  - Component properties
    In the Edit and Calculate work perspective, your selection in the drawing is highlighted in colour. Section properties and component properties can be displayed and edited differently from the global project settings.
  - Component filter
    The component filter allows you to quickly filter the selected components in the drawing.
  - Drainage areas
    The Drainage areas window in the Drainage section is divided into two tabs.
  - Find function
    CALHYDRA has a parameterised search function that supports you when searching for drawn sections and components in the drawing and when selecting products.
  - Hydraulics report
    With the preview of the calculation output, CALHYDRA supports you in customising the calculation output.
  - Mass extract
    With the preview of the mass statement, CALHYDRA supports you in customising the printout of the masses.
  - Material editor
    With the material editor, CALHYDRA supports you with convenient and fast determination of your dimensions.
  - Diaphragm expansion vessel
  - Options Wizard (waste water)
    The options wizard guides you through the settings for the design.
  - Options assistant (heating)
    The options wizard guides you through the settings for the design.
  - Options Wizard (drinking water)
    The options wizard guides you through the settings for the design.
  - Project data
    The Project data dialogue contains project information for the current project, for example for the project cover sheet or to determine the rainfall donations.
  - Product sequence or product selection
    In the Product sequence or Product selection dialogue, select the product sequence or a product for components.
  - Project data
    The Project data dialogue contains project information for the current project, for example for the project cover sheet or to determine the rainfall donations.
  - Simulation
    The simulation is divided into a circulation simulation for hot and cold water and a simulation of a cold water hygiene system.
    - Circulation simulation
      Basics of circulation simulation
      - Flow splitter
        Displays the flow splitters and their details in the currently selected flow path
      - Valve settings
        Displays the valve settings of the currently selected valve
      - Pump settings
        Settings dialogue for the circulation pump
      - DHW heater
        The DHW heater dialogue shows the settings of the DHW heater or the cold water cooler.
      - Circulation simulation messages
        Various messages can occur in the messages during the simulation, which are explained below.
    - Cold Water Hygiene System
      Basics of simulating a cold water hygiene system
    - Simulation report
      With the preview of the calculation output, CALHYDRA supports you in customising the calculation output.
  - Section properties
    In the Edit and Calculate work perspective, your selection in the drawing is highlighted in colour. Section properties and component properties can be displayed and edited differently from the global project settings.
  - Insert drawing reference
    The Insert drawing reference function guides you through the settings for inserting a drawing reference.
  - Water softening system

Circulation simulation messages

Various messages can occur in the messages during the simulation, which are explained below.

Pressure loss at the valve is too high: If the pressure drop (pressure loss) at a valve is too high, this can result in unwanted noise. This limit is specified by the valve manufacturer. If this value is exceeded, this message is issued. In this case, it should be considered whether a further control level (additional static valves) can be used to distribute the pressure losses over several valves.
Minimum temperature not reached: The most important task of DHW circulation is to maintain the temperature in the pipe network. If the temperature falls below the minimum temperature, this message is displayed. The minimum temperature corresponds to the storage tank temperature minus the maximum temperature difference. Both values can be manipulated in the simulation. An excessive temperature drop in the network can have various causes:
- The total volume flow is too low (select a larger pump)
- The volume flow in a specific flow path is too low (check the valve technology or design of the network)
Maximum flow velocities exceeded: A maximum flow velocity is specified for the simulation in the Project settings dialogue. This value does not influence the simulation, but is only required for the subsequent check. If this flow velocity is exceeded in a section, this message is displayed.
Note:
Please note that the flow velocity specified for the calculation in CALHYDRA is primarily used for dimensioning the pipework. Therefore, the maximum flow velocity in the simulation should not be confused with the flow velocity on which the calculation is based.
Disinfection temperature undershot: If the simulation is in disinfection mode, the first priority is to maintain a minimum temperature of 70 °C in the entire pipe network. If the temperature falls below this temperature in a section, this message is displayed.