This information is part of the Modelica Standard Library maintained by the Modelica Association.

This partial model contains the basic connectors and variables to allow heat transfer models to be created that do not store energy, This model defines and includes equations for the temperature drop across the element, dT, and the heat flow rate through the element from port_a to port_b, Q_flow.

By extending this model, it is possible to write simple constitutive equations for many types of heat transfer components.