Gas Cylinder $—$ Gas volume in a gas-filled piston accumulator

The Gas Cylinder component describes a high-pressure gas volume in a cylinder. For initializing the amount of gas in the cylinder, it is assumed that the preload pressure, p_preload, and the initial temperature, T_start, completely fill the cylinder to initialFilling $\cdot$ s_max, where s_max is the maximum position of the cylinder.

Connections

 Name Description Modelica ID ${\mathrm{flange}}_{a}$ flange_a ${\mathrm{flange}}_{b}$ flange_b $\mathrm{environment}$ Port for environment temperature environment

Parameters

General Parameters

 Name Default Units Description Modelica ID ${V}_{\mathrm{start}}$ $\mathrm{PistonArea}{s}_{\mathrm{max}}$ ${m}^{3}$ Initial Volume V_start ${T}_{\mathrm{start}}$ $300$ $K$ Initial gas Temperature T_start ${t}_{\mathrm{thermal}}$ $s$ Thermal time constant t_thermal use time constant $\mathrm{true}$ use_time_constant $\mathrm{\alpha }$ $150$ $\frac{W}{{m}^{2}K}$ Heat transfer coefficient alpha ${p}_{\mathrm{preload}}$ $\mathrm{Pa}$ Gas preload pressure p_preload ${V}_{\mathrm{max}}$ $1$ ${m}^{3}$ Maximum volume V_max ${d}_{i}$ $m$ Inner diameter of cylinder d_i ${s}_{\mathrm{max}}$ $m$ Maximum position of cylinder s_max initial filling $1$ Initial filling of cylinder as fraction of total initialFilling

Constant Parameters

 Name Default Units Description Modelica ID $\mathrm{PistonArea}$ [1] ${m}^{2}$ Cross section area PistonArea

[1] $\frac{1}{4}{d}_{i}^{2}\mathrm{\pi }$