Home
Appendix
Dialogues and additional information
Design options (heating)
Drawing-specific settings relating to your calculation are set in the Design options dialogue.
Decentralised DHW heating (design options for heating)
In the Decentralised DHW heating section, the formulas used to calculate and use the simultaneity factors for decentralised DHW heating for the home stations are specified.

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.
    - Pipes/insulation (heating design options)
      The Pipes/Insulation section under Recording allows you to customise individual definitions for each section type.
    - Pipe rows (heating design options)
      The Pipe rows area under Recording provides an overview of individual pipe systems and enables individual adjustments to be made in the pipe system.
    - Manufacturer catalogues (design options for heating)
      The links to the respective product sequence are defined by component category in the Manufacturer catalogues area under Entry. Prefixes for the labelling are also defined.
    - System temperatures (heating design options)
      The temperatures used on the heat generator and the 3-way valve are specified in the System temperatures area.
    - Network section (heating design options)
      The maximum flow velocities and the average pressure gradient for each network section are defined in the Network section under Calculation.
    - Decentralised DHW heating (design options for heating)
      In the Decentralised DHW heating section, the formulas used to calculate and use the simultaneity factors for decentralised DHW heating for the home stations are specified.
    - Fluids (heating design options)
      The heat transfer medium used is selected in the Fluids area under Calculation.
    - Hydraulic balancing (heating design options)
      Settings for valve authorities and other settings for hydronic bal ancing are made in the hydronic balancing area under Calculation.
    - Components (Heating design options)
      The maximum pressure loss at the heat meter and the maximum flow rate at the heating manifold are entered in the Components area under Calculation.
  - 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.
  - 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

Decentralised DHW heating (design options for heating)

In the Decentralised DHW heating section, the formulas used to calculate and use the simultaneity factors for decentralised DHW heating for the home stations are specified.

Simultaneities

Select the desired definition from the drop-down menu.
DIN 4708, TU Dresden and VDI 2072 are available for selection.

Note:
The currently active setting colours the corresponding curve in the diagram red.

The simultaneity factors for home stations are calculated using the following formulae:
Table 1. Calculation of simultaneity factors
VDI 2072 TU Dresden DIN 4708
N: Number of identically equipped flats n: Number of home stations n: Number of home stations
This results in the following diagram for the respective simultaneity factors:

Temperatures

Enter the inlet temperature for cold water (PWC) at the decentralised DHW heater in °C in the PWC inlet temperature input field.
In the PWH temperature with circulation input field, enter the outlet temperature for hot water (PWH) at the decentralised DHW heater when using hot water circulation (PWH-C) in °C.
In the PWH temperature without circulation input field, enter the output temperature for hot water (PWH) at the decentralised DHW heater in °C if no DHW circulation (PWH-C) is used.