.BuildingSystems.Fluid.Storage.BaseClasses.Buoyancy

Information

This model outputs a heat flow rate that can be added to fluid volumes in order to emulate buoyancy during a temperature inversion. For simplicity, this model does not compute a buoyancy induced mass flow rate, but rather a heat flow that has the same magnitude as the enthalpy flow associated with the buoyancy induced mass flow rate.

Contents

Name	Description
Medium	Medium model

Revisions

• June 7, 2018 by Filip Jorissen:
  Copied model from Buildings and update the model accordingly. This is for #314.
• December 14, 2012 by Michael Wetter:
  Renamed protected parameters for consistency with naming convention.
• October 8, 2011 by Michael Wetter:
  Added noEvent(...) to Q_flow[i] = k*smooth(1, if dT[i]>0 then dT[i]^2 else 0); since the equation returns the same value to the left and right of dT[i]>0.
• September 16, 2011 by Michael Wetter:
  Changed the implementation from Q_flow[i] = k*max(heatPort[i+1].T-heatPort[i].T, 0); to Q_flow[i] = k*smooth(1, if dT[i]>0 then dT[i]^2 else 0);. The previous implementation was not differentiable. In modeling a solar system, this change reduced the computing time by a factor of 20 during the time when the pumps were almost switched off and colder temperature was fed from the collector to the tank.
• October 28, 2008 by Michael Wetter:
  First implementation.