Poly

Figure 1.9: System Poly: acausal bond graph

The acausal bond graph of system Poly is displayed in Figure 1.9 (on page ) and its label file is listed in Section 1.1.10 (on page ).

This four-port component computes the temperature following a polytropic expansion using:

$$T_2 = T_1 \left ( \frac{P_2}{P_1} \right )^\alpha$$ (1.2)

where $\alpha = \frac{n-1}{n}$ and $n$ is the coefficient of polytropic expansion. This component imposes zero flow at all its ports and therefore does not affect energy balance.

The output is bicausal as it imposes both $T_2$ and a zero flow. This is implemented using the bicausal SS component labeled ``zero''.