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Appendix
Dialogues and additional information
Diaphragm expansion vessel
Design of a diaphragm expansion vessel
To design a diaphragm expansion vessel, several calculation parameters are required, which are distributed over three components.

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
    - Design of a diaphragm expansion vessel
      To design a diaphragm expansion vessel, several calculation parameters are required, which are distributed over three components.
    - Pressure ranges of the diaphragm expansion vessel
      The Characteristic curve window shows the pressure distribution of a selected diaphragm expansion vessel in the drawing.
  - 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

Design of a diaphragm expansion vessel

To design a diaphragm expansion vessel, several calculation parameters are required, which are distributed over three components.

Table 1. Calculation parameters on the heat generator component
Values required for the design	In CALHYDRA	Additional information
Heat output of the heat generator	Output power (W)	The preset standard value can be adjusted.
Flow temperature	Flow temperature (°C)	The value corresponds to the flow temperature set in the design options or the options wizard. The fluid temperature is used to calculate the percentage expansion of the fluid in relation to the lowest system temperature.
Water content of the heat generator	Content (litres)	The value is optional.
Maximum setpoint setting of the temperature controller	Max. Temperature controller (°C)	The preset standard value can be adjusted and influences the maximum expansion of the fluid.
Safety temperature limiter	Safety temperature limiter (°C)	The preset default value can be adjusted and specifies the setting value of the safety temperature limiter installed on the heat generator. The set value must be at least 5 K above the component > propertiesHeat generator max > . > Temperature controller (°C) > . If the setting value of the safety temperature limiter is above 100 °C, the calculation of the evaporation pressure is affected.

Table 2. Calculation parameters on the diaphragm expansion vessel component
Values required for the design	In CALHYDRA	Additional information
System volume	System volume (litres)	The displayed value is calculated.
Expansion volume	Expansion volume (litres)	The displayed value is calculated.
Static pressure	Static pressure (hPa)	The displayed value is calculated. The static pressure results from the difference in height between the highest component in the system and the installation height of the diaphragm expansion vessel. This results in approx. 100 hPa per metre of height difference.
Evaporation pressure	Evaporation pressure (hPa)	The displayed value is calculated.
Upstream pressure	Initial pressure (hPa)	The displayed value is calculated.
Final pressure	Final pressure (hPa)	The displayed value is calculated.
Water supply	Water supply (litres)	The displayed value is calculated.
Minimum nominal volume	Minimum nominal volume (litres)	The displayed value is calculated.
Maximum filling pressure	Maximum filling pressure (hPa)	The displayed value is calculated.
Minimum filling pressure	Minimum filling pressure (hPa)	The displayed value is calculated.
Product pre-pressure	Product pre-pressure (hPa)	The displayed result value is taken from the product data of the designed diaphragm expansion vessel.
Maximum permissible operating pressure	Max. permissible operating pressure (hPa)	The displayed result value is taken from the product data of the designed diaphragm expansion vessel.
Nominal product volume	Nominal product volume (litres)	The displayed result value is taken from the product data of the designed diaphragm expansion vessel. The designed product must have a larger nominal product volume than the minimum nominal volume of the diaphragm expansion vessel.

Table 3. Calculation parameters on the safety valve component
Values required for the design	In CALHYDRA	Additional information
Response pressure of the safety valve	Set pressure (hPa)	The displayed value is taken from the product data of the designed safety valve. The response pressure of the safety valve corresponds to the maximum permissible operating pressure of the diaphragm expansion vessel used.

Table 4. Further calculation results
Values required for the design	In CALHYDRA	Additional information
Percentage expansion of the fluid	-	The value is calculated.