Flow functions

In MFM functions are defined in relation to the processing of flows of mass and energy. MFM is based on a set of six generic flow functions representing different primitive operations performed on either mass or energy flow.

These six functions are shown in the figure below and include: source, transport, storage, sink, balance and barrier. To enable a better representation of chemical process systems, conversion, seperation and distrubution have been included as alternative representations of the barrier for specific instances.

flow_functions
Mass and Energy Flow Functions

Flow functions in MFM are not isolated. They have to be included in a function structure. In MFM, a function structure represents a set of functions connected by causal relations. A function structure can contain mass and energy flow functions and control functions. There is distinguised between three subtypes: mass flow structures, energy flow structures and control flow structures.

 

The rules and function states of each flow function can be seen in the table below.

flow_function_states

In the figure below, all possible combinations of flow functions are shown. These combinations depend on both the flow function type and influence relation.

flow_function_influences

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