BondLib.Thermal.RSrad

# .BondLib.Thermal.RSrad

The bondgraphic radiative resistive source element

## Information

The bondgraphic radiative resistive source is a directed TwoPort element. It inherits the effort and flow variables from the directed TwoPort. The specific radiation constant and the rediating surface are modeled as parameters.

The resistance, R, is inverse proportional to the square of the temperature at the inflow, T1 = e1.

The radiative resistive source element is to be used in radiation of thermal systems. The primary side of the radiative resistive source element is assumed to be in the thermal domain.

The resistive source element has free causality on the primary side, and fixed causality on the secondary side. The causality stroke is at the element on the secondary side (a source of entropy, rather than a source of temperature).

    Potential variables:

     e1:      Bondgraphic effort variable of inflow

     f1:      Bondgraphic flow variable of inflow, normalized positive for flows into the model

     e2:      Bondgraphic effort variable of outflow

     f2:      Bondgraphic flow variable of outflow, normalized positive for flows out of the model

     R:       Bondgraphic radiative resistance

    Parameters:

     sigma:   Specific radiation constant (default value = 1 W/(m2*oK4)

     A:       Radiating surface (default value = 1 m2)

Equations:

R = 1/(sigma*A*e1*e1)
e1 = R*f1
f2 = f1*(e1/e2)

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