Details on the Required Volume Flow Determination According to
Information on the dialog Required Volume Flow Rate Determination according to in connection with fresh water stations and heat interface units.
Use the method according to DIN 4708 to determine the required volume flow rate for residential buildings using the mandatory information on apartment type and the important tapping points of the dwelling(s).
For the determination of the required volume flow rate of non-residential buildings, use the method according to VDI 6003, in which the building type and the desired comfort level must also be specified, in addition to the tapping points. In addition, this procedure allows you to adjust the hot water temperature at the taps.
When you confirm your input, the required volume flow rate is converted to tap rate, and applied in the Requirement Potable Water dialog.
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Apartment Types (DIN 4708)
In the table on the left, you determine the requirements index N.
Qty.
Indicates the number of apartments. The number of persons is automatically adjusted.
Apartment Type
Defines the type of apartment. After clicking in a line, a standard apartment with 3.5 persons (average occupancy per apartment in Germany) is suggested first.
Rooms
Indicates the number of rooms. The number of persons is automatically adjusted.
Persons
If you adjust the number of apartments or rooms, the program will automatically adjust the number of persons. You can overwrite this number.
N
The requirement index of the standard apartment is N=1. The value is determined depending on the number of persons and the cumulative heat requirement of the tapping points.
∑N
Value of N multiplied by the number of apartments.
Relevant Tapping Point(s) in this Apartment (DIN 4708)
In the table on the right, you set the tapping points of the apartment marked in the table on the left. If you specify multiple tapping points, it is assumed that they will operate simultaneously.
Qty.
Indicates the number of tapping point.
Tapping Point
Indicates the name of tapping point.
l
Indicates the storage volume of the potable water heater for the relevant tapping point.
kWh
Indicates the heat requirement of the tapping point.
Determination of Loading Capacity/Storage Volume (DIN 4708)
Depending on the predefined requirement period, heat requirement, storage volume and loading capacity are determined and displayed. The cold water temperature originates from the calculation parameters of the configuration dialog. You define the hot water temperature in the component dialog of the potable water heater.
Demand (DIN 4708)
This area shows the determined values for the peak heat requirement WzB, the hourly heat requirement 1.0 and the period heat requirement W2TN.
Required Volume Flow Rate (DIN 4708)
Displays the determined Required Volume Flow Rate.
Building Type and Comfort Levels (VDI 6003)
Specifies the building type and the comfort level.
Cold Water Temperature (VDI 6003)
Displays the temperature of cold water. The cold water temperature is the basis for the determined capacity data of the heat exchanger within the fresh water station or heat interface unit.
Hot water temperature (VDI 6003)
Sets the hot water temperature used to calculate the required flow rate for water heating.
Table of Tapping Points (VDI 6003)
Qty.
Specifies the quantity of tapping points.
Qty. defined
Displays the number of tapping points detected in the model.
Tapping Points
Displays the name of the tapping point.
Comfort Level
Displays the comfort level of the tapping points.
Tapping Temperature
Displays the temperature at the tapping point as specified by VDI 6003.
Tap Rate
Displays the tap rate specified in VDI 6003 for the corresponding tapping temperature.
Hot Water Demand
Displays the calculated hot water demand.
Required Volume Flow Rate, Heating Requirement (VDI 6003)
Displays the values determined for the Required Volume Flow Rate and Heat Requirement.