General Tab

X/Y-Coordinate

In these input fields the node situation is entered in the x- or y-coordinate system. These are, for example, the Gauß-Krüger coordinates of the node from a layout plan. sisHYD permits the input of network nodes graphically; see "Create node" on page 123.

Height VL/RL/KLB

Contains the geodetic height of the node above Normal-Zero for the individual network positions.

VL/RL/KLB

These marker fields specify at which network positions the network node exists. The abbreviation VL stands for the network position "Flow", the abbreviation RL for "Return" and the abbreviation "KLB" for the KLB leader .

Steam trap

Mark this field in order to place a steam trap between flow and return.

✍ The field is displayed only for steam networks.

Efficiency

The efficiency of the steam trap. An efficiency of 0.8 is preset.

✍ The field is displayed only for steam networks.

Never reduce

Give the node higher priority when designing with clash control. The node is always normally designed (except when nodes clash, which all set this attribute).

Connections Tab

The list indicates all elements attached to the node.

No new elements can be added using the list. The list is only for information purposes.

✍ The input dialog for the attached element is opened by double clicking in a table row.

Column 1 – Network position

The first column names the network position at which the element is located. Possible values are:

Abbreviation – Network position

VL – Flow

RL – Return in long-distance heating networks

KLB – Constant leaders in long-distance heating 3-leader networks

Column 2 – Symbol for the kind of element

Possible elements and their symbols:

– Piping

– Pump

– Valve

– Consumer

– Feeder

Customers Tab

The list indicates all Customer attached to the nodes. It is only for information purposes and shows the current allocation of the customers to this node.

✍ By double clicking on a customer name in the list you open the dialog to edit this

customer.

Results Tab

Using this tab, you directly see the calculation results for the node. 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 node are computed and indicated subject to the module:

• Pressure – Is the absolute/manometric pressure at the node.
• Steam pressure – Steam pressure at given node temperature.
• Temperature – Is the temperature calculated at the node.
• Diff. pressure – Is the difference of pressure on return. The information is available only for flow and KLB nodes.
• Supply time – Is the average supply time from the feeders to the node. The size is indicated only if the supply times are also calculated in Steady State Network Calculation.
• Sum of nominal capacity – Is the sum of the connected values of the consumers connected with the node.
• Consumer loads – Is the sum of the consumer loads at the node. Unlike the connected loads the effective load at the node for current network calculation is indicated here.
• Consumer volume flow – Is the sum of the flow rates of the consumers connected to the node.
• Consumer mass flow – Is the sum of the mass flows of the consumers connected to the node.
• Condensate mass flow – Condensate mass flow which flows over the steam trap.
• Exit dampness – Exit dampness at the steam node.
• Pressure height – The hydraulic pressure at the node is related to the reference height in the mask Network data.