Ideal Pump

Model of an ideal pump

 Description The Ideal Pump component is a two-port thermal-fluid component that models an ideal (lossless) pump driven by a rotational flange. The temperature and enthalpy of the medium are not changed. The Medium parameter specifies the name of a Thermal-Fluid Media record, which must be in the model at the same or higer level. The Use default medium boolean parameter, when true, sets the name of the Medium parameter to fluidMedium1, which corresponds to the default name of a fluid medium record. To use a different name, uncheck the box and enter the name in the parameter input that appears.
 Equations $\left\{\begin{array}{cc}\left\{\Delta p=0,{\mathrm{\tau }}_{a}=0\right\}& \left|w\right|<\mathrm{small}\\ \left\{\Delta p=-\Delta {p}_{\mathrm{max}}\mathrm{sign}\left(\frac{w}{{w}_{\mathrm{nom}}}\right){\left(\frac{w}{{w}_{\mathrm{nom}}}\right)}^{2}\left(1-\left|\frac{{V}_{\mathrm{flow}}}{{V}_{{\mathrm{flow}}_{\mathrm{max}}}}\frac{{w}_{\mathrm{nom}}}{w}\right|\right),{\mathrm{\tau }}_{a}w=-\Delta p{V}_{\mathrm{flow}}\right\}& \mathrm{otherwise}\end{array}$ ${Q}_{\mathrm{flow}}=0$ ${T}_{q}=T$ $h={c}_{p}T$

Variables

 Name Units Description Modelica ID $\Delta p$ $\mathrm{Pa}$ Pressure drop a->b dp ${Q}_{\mathrm{flow}}$ $W$ Heat exchange with ambient Q_flow $\Delta T$ $K$ Temperature increase of coolant in flow direction dT $T$ $K$ Outlet temperature of medium T ${T}_{a}$ $K$ Temperature at flowPort_a T_a ${T}_{b}$ $K$ Temperature at flowPort_b T_b ${V}_{\mathrm{flow}}$ $\frac{{m}^{3}}{s}$ Volume flow a->b V_flow $w$ $\frac{\mathrm{rad}}{s}$ Angular velocity of flange w

Connections

 Name Description Modelica ID ${\mathrm{flowPort}}_{a}$ flowPort_a ${\mathrm{flowPort}}_{b}$ flowPort_b ${\mathrm{flange}}_{a}$ flange_a

Parameters

 Name Default Units Description Modelica ID $\mathrm{medium}$ fluidMedium medium $m$ $1$ $\mathrm{kg}$ Mass of medium m $\mathrm{fix}{T}_{0}$ $\mathrm{false}$ True (checked) means ${T}_{0}$ is enforced, otherwise it is a guess T0fixed ${T}_{0}$ $293.15$ $K$ Initial temperature of medium T0 $\Delta {p}_{\mathrm{max}}$ $2$ $\mathrm{Pa}$ Maximum pressure at ${V}_{\mathrm{flow}}=0$ dp0 ${w}_{\mathrm{nom}}$ $1$ $\frac{\mathrm{rad}}{s}$ Nominal speed wNominal ${V}_{{\mathrm{flow}}_{\mathrm{max}}}$ $2$ $\frac{{m}^{3}}{s}$ Maximum volume flow rate at $\Delta p=0$ V_flow0

 Modelica Standard Library The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.