model HeatTankT
 parameter Area=1;
 connector TankStream
 Real pressure;
 flow Real volumeFlowRate;
 Real temp;
 end TankStream;
 TankStream Inlet, Outlet;
 Real level;
 Real temp;
equation
 Area*der(level) = Inlet.volumeFlowRate + Outlet.volumeFlowRate;
 Outlet.pressure = Inlet.pressure;
Area*level*der(temp) = Inlet.volumeFlowRate*Inlet.temp +
 Outlet.volumeFlowRate*Outlet.temp;
Outlet.temp = temp;
end HeatTankT;