Transfer of Heat Energy
In contrast to the modeling of energy systems with the material model MM_Water and the associated components from the Component template library folders Cooling Supply and Heat Supply (all with blue symbols), the material model for Heat Transfer MM_Heat (orange symbol) is not designed to map real technical heat generators and consumers. Instead, it is about the transfer of heat energy between different media, e.g., for heat recovery from exhaust gas in waste heat boilers.
Heat Transfer with Components of Heat Transfer
To model the heat transfer, use the templates from the Heat Transfer component template folder.
The components can transfer heat between the fluids water, steam and air. All combinations of these media (steam-steam, steam-water, air-steam, etc.) are possible in heat exchangers.
The following figure shows how heat transfer between different fluids is implemented in TOP-Energy. In the example of heat recovery (HR), heat is transferred from the exhaust gas to the hot water circuit.
Heat release: supplied heat flow = absorbed heat power = dissipated cooling power = dissipated cold flow
Heat extraction: extracted heat flow = dissipated heat power = absorbed cooling power = supplied cooling power.
Integration of Heat Sources and Sinks with Components of Heat Transfer
You can also integrate unspecified heat sources (and sinks). If time series of the heat provided or required are available from components not modeled more closely, such as furnaces or other production plants, these can be connected directly and easily to the heat exchangers. The following figure shows an example.
In order to maintain the linear structure of the system of equations, the modeling of the second main theorem of thermodynamics in the heat exchangers must be dispensed with. The temperature levels are not (or only partially) included in the heat transfer. The transferable heat can be limited in the components. It should be selected according to the heat actually transferable due to the temperature differences.
