Pipe
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Use
The pipe component simulates the temperature drop in a pipe. It also acts as an additional volume.
The pipe component offers the following options for calculating the temperature drop:
Basic: An external definition of the ambient temperature is made using a RealExpression.
Environment Connector: The ambient temperature is provided using the EnvironmentConnector.
External Heat Power: There is an external definition for heating power or power loss to the environment.
Parameters and Connectors
Basic
To ensure the correct operation, the volume flow has to flow from ▶PipeIn to ▶PipeOut. The thermal energy and therefore temperature loss is calculated from the parameterizable medium (rhoMed, cpMed) and tube properties (lPipe, dPipe, QLossCoefficient) as well as the temperature of the incoming medium and the environment temperature of the pipe. In this case, the environmental temperature is set as a temperature value via the real input ▶TEnvironment. The initial temperature of the pipe can be adjusted via the TPipeInit parameter.
Environment Connector
If the useEnvironmentPort parameter is set to 'true', the environment model can be connected to the pipe via the ▶useEnvironmentConditions. If the GroundTemp parameter remains set to 'false', it is assumed that the temperature TAmbient measured in the environment is also the ambient temperature of the pipe. In this case, a windless, shaded installation (no solar gain) outdoors is assumed.
If the parameter GroundTemp is set to ‘true’, the parameter depthPipe must also be set. This parameter and the properties of the ground specified in the environment are used to calculate the ground temperature at the specified installation depth. It is assumed that the ground temperature is not affected by the pipe.
External Heat Power
If the extHeatInput parameter is set to 'true', an additional heat loss (negative value) or heat gain (positive value) can be considered via the input ▶QHeatPipe. This could be used for the calibration of the pipe or to map a pipe trace heating.
Model Background
The ground temperature in the pipe is calculated by the same approach as the ground temperature in the ground component.