Details on Technical Data for Heat Interface Units
Information about the component data dialog for heat interface units in the Rohrnetzberechnung Quartiersnetze.
In this dialog, you define the settings for the component data for heat interface units in the Rohrnetzberechnung Quartiersnetze on the first tab. On the second tab, you define the prioritization for the the article sets of the heat interface unit.
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Name
In this field you can enter an individual name for the component. Clicking on 
restores the original name and overwrites the previous entry.
Settings tab
Design Temperature
You define the necessary to temperatures for the heat interface unit in this area.
Flow: Sets the required flow temperature for the heat interface unit.
Return: Defines the required return temperature for the heat interface unit.
Return DHW: Defines the return temperature of the domestic water.
Output of Capacities
In this area, you either specify the capacity data of the heat interface unit on the Primary Side or you calculate the data by specifying the requirements on the secondary side.
Efficiency: Determines the efficiency of the heat interface unit, which affects the Heat Capacity and Mass Flow Rate of the primary side. The efficiency depends on the thermal efficiency of the heat interface unit, the temperature difference between flow and return and the quality of the control system.
Secondary Side - Heating
Heat Capacity: Determines the heat capacity required for heating on the secondary side.
Secondary Side - Potable Water Heating
Domestic Hot Water Capacity: Determines the capacity required for DHW on the secondary side.
Temperature DHW: Defines the required temperature for the processing DHW.
Volumetric Flow Rate DHW: Defines the volume flow rate required for the preparation of domestic hot water, or indicates this based on the entered values.
Primary Side
Heat Capacity: Determines the heat capacity required on the primary side or indicates this according to the entered values.
Mass Flow Rate: Determines the required mass flow rate on the primary side or indicates this according to the entered values.
Pressure Loss Data
Pressure Loss: Determines the pressure loss of the flow and return on the secondary side.
Control Valve included
Enabled: The pressure loss between the primary and secondary sides is balanced by the control valve of the heat interface unit. The resulting value is displayed after the calculation in the field Pressure Loss Bal.
Diversity
Drop-down list to select of the diversity of secondary side. Diversity determines how many consumers on the secondary side draw heat at the same time and thus to what share the required capacity of the heat interface unit is considered in the network. The following options are available:
- 100%: All consumers are considered at full capacity at the same time. This method is usually used as a worst-case approach or for test scenarios without reduction through diversity.
- DS 439: Danish standard for typical load profiles of the secondary sides in local and district networks. Due to the consideration of realistic usage distributions, the DS 439 is suitable for practical network simulations.
- VDI 2072: VDI 2072 should be used for secondary sides in which centrally heated DHW is provided via fresh water stations or centralized systems. This guideline realistically determines the simultaneous tapping capacities, which form the basis for storage tank, transfer and network dimensioning. By combining usage profiles and empirical data, this method yields results that are significantly more practical than, for example, a simple generalized estimate according to Winter.
Typical areas of application are networks in which several users draw DHW at the same time but not permanently, for example, apartment buildings with fresh water stations and districts with central heat supply and decentralized fresh water stations such as hotels, residential complexes or public buildings.
- Winter: In this method, it is simplistically assumed that there is an increased diversity demand on the secondary side during the heating season. The method is suitable for mapping conservative load peaks in winter operation due to the increased diversity by adding heating and DHW demand. It should be noted that usually, when adding these two loads together, it is not the case that the full DHW and heating loads occur simultaneously. The use of this method therefore leads to very high mass flow rates and large pipe dimensions.
Priority Circuit
The Priority Circuit option is only available if the capacity data is calculated via the secondary side and the configuration VDI 2072 is selected for Diversity.
Enabled: If necessary, the heat capacity for heating is reduced or switched off to ensure sufficient capacity for DHW heating.
Material tab
On the second tab, you define the local prioritization for the component's article sets. Any global settings defined in the corresponding Priorities (…) dialogs for building connections in the Connection Sets column of the Pipes and Connection Sets dialog may be overridden for this component.
Connection Type: Determines how the trenches are routed into the building and controls the selection options available under Option 1.
Option 1, Option 2, Option 3: Drop-down lists for defining the connection sets offered in the table. By selecting from the lists, you determine which entries are available in the subordinate list.
Additional Connection: Determines the length of the additional connection pipes that are required in addition to the drawn pipes for the connection of the heat interface unit. Additional pipes are also part of the considered bill of materials.
Connection Sets: Table for prioritizing individual sets of items. Select a row, then use the 
and 
buttons to adjust the order for prioritizing the item sets.
Reset: Resets the order to the one specified in the corresponding Priorities (…) dialog for building connections, which is defined via the Pipes and Connection Sets dialog.