General Tab

Initial and end nodes - Combination fields, with which the linkage of the consumer within the network between initial and end nodes is specified.

✍ In general, a consumer’s initial node is always a flow node (for three-leader systems flow or KLB nodes). The end node must be a return node.

In the special case of return consumers, the starting node is also a return node.

Consumer group - Assigns a consumer group to the consumer. The consumer group specifies the load behavior of the consumer and decides among other things on the return temperature.

The consumer groups are provided and edited with the dialog Consumer groups.

Zone - Assigns the consumer to one of the configured zones.

✍ The allocation is insignificant for actual hydraulic calculation. It is useful in the case

of the formation of network variables for cost calculations.

Connection load - See "nominal mass flow/nominal volume flow".

Nominal mass flow/nominal value stream - Consumer value in the indicated unit with a load factor of 100%.

✍ The consumer value consumed can either be indicated as connection load, nominal mass flow or nominal value stream. The selection field concerned should be marked, so that the associated input field (in the illustration the field nominal mass flow) is released for input. For gas and water networks only mass flow and flow rate are available for selection.

Bypass diameter - If a bypass is to be used parallel to the consumer, you can enter the diameter of the bypass pipe here. The bypass is calculated as individual flow resistance with a Zeta value of 3.8.

Return consumers - Mark the field in order to display and select only return nodes in the list of the starting nodes. Thus a consumer becomes a return consumer. If this option is selected, the field "initial node" is reset and the initial node must be allocated.

✍ When switching between consumer data records, sisHYD automatically updated the status of the field depending on the consumer’s set initial mode.

Limits Tab

Here the operation limits of the consumer are entered/changed. If these values are not 0, the defaults from the associated consumer group are overwritten.

Min. Pres Difference - For each consumer if necessary a minimum difference of pressure can be indicated, which is necessary for the heat supply of the consumer. This value overwrites the min difference of pressure of the associated consumer group. indicated in the consumer group. If this value falls below during calculation, an error message occurs.

Max. Operating Pressure - For each consumer if necessary a max. pressure can be indicated which may not be exceeded in operation. This value overwrites the max. pressure of the associated consumer group indicated in the consumer group. If this value is exceeded during calculation, an error message occurs.

Maximum Mass Flow - For each consumer if necessary a max. mass flow can be set. The heat extraction of the consumer is limited to the max. mass flow if the entry temperature is too low.

Min. Supply Temperature - For each consumer a minimum necessary inlet temperature (e.g. a contractually assured temperature) can be entered, which is checked at the end of the calculation. If the value falls below the minimum, this leads to an error message.

Min. Supply Pressure - For each consumer the minimum necessary pressure on entry can be set. If this value falls below during calculation, an error message occurs.

Max. Return pressure - For each consumer the maximum permissible pressure at the exit of the consumer can be given. If this value is exceeded during calculation, an error message occurs.

Customer Tab

Shows a list of all customers, who were combined into the current consumer. ✍ By double clicking on a customer, the assigned customer data set is opened.

Result Tab

You can access the calculation results for the consumer using this tab. The height of the dialog mask is adaptable to be able to show the results list completely.

• Calculation - Indicates the names of the network calculation to which the results belong.
• List of the results - The following results for the consumer are computed and indicated subject to the module:
  • Mass Flow – Is the calculated consumer throughflow.
  • Flow rate in – Flow rate in the entry flow of the consumer.
  • Flow rate out – Flow rate in the exit flow of the consumer.
  • Input Temperature – Is the temperature in the entry flow of the consumer.
  • Output Temperature – Is the temperature in the exit flow of the consumer.
  • Input Pressure – Is the entry pressure at the entry flow of the consumer.
  • Output Pressure – Is the exit pressure at the exit flow of the consumer.
  • Pressure differential – Is the pressure difference between flow (or KLB leader) and return from the consumer.
  • Load – Is the load actually removed by the consumer.
  • Average. retention time – (only thermally intermittent calculation).
  • Bypass mass flow – The bypass mass flow calculated on the basis of the pressure difference.
  • Error – The description of the errors if any occur.