Annex60.Fluid.Movers.FlowControlled_dp

# .Annex60.Fluid.Movers.FlowControlled_dp

Fan or pump with ideally controlled head dp as input signal

## Information

This model describes a fan or pump with prescribed head. The input connector provides the difference between outlet minus inlet pressure. The efficiency of the device is computed based on the efficiency and pressure curves that are defined in record `per`, which is of type Annex60.Fluid.Movers.SpeedControlled_Nrpm.

If `filteredSpeed=true`, then the parameter `dp_nominal` is used to normalize the filter. This is used to improve the numerics of the transient response. The actual pressure raise of the mover at steady-state is independent of the value of `dp_nominal`. It is recommended to set `dp_nominal` to approximately the pressure raise that the fan has during full speed.

See the User's Guide for more information.

## Revisions

- December 2, 2016, by Michael Wetter:
  Removed `min` attribute as otherwise numerical noise can cause the assertion on the limit to fail.
  This is for #606.
- November 14, 2016, by Michael Wetter:
  Changed default values for `heads`.
  This is for #583.
- March 2, 2016, by Filip Jorissen:
  Refactored model such that it directly extends `PartialFlowMachine`. This is for #417.
- January 22, 2016, by Michael Wetter:
  Corrected type declaration of pressure difference. This is for #404.
- November 5, 2015, by Michael Wetter:
  Removed the parameters `use_powerCharacteristics` and `power` from the performance data record `per` because Annex60.Fluid.Movers.FlowControlled_dp and Annex60.Fluid.Movers.FlowControlled_m_flow fix the flow rate or head, which can give a flow work that is higher than the power consumption specified in this record. Hence, users should use the efficiency data for this model. The record has been moved to Annex60.Fluid.Movers.Data.SpeedControlled_y as it makes sense to use it for the movers Annex60.Fluid.Movers.FlowControlled_Nrpm and Annex60.Fluid.Movers.FlowControlled_y.
  This is for issue 457.
- April 2, 2015, by Filip Jorissen:
  Added code for supporting stage input and constant input.
- January 6, 2015, by Michael Wetter:
  Revised model for OpenModelica.
- February 14, 2012, by Michael Wetter:
  Added filter for start-up and shut-down transient.
- May 25, 2011, by Michael Wetter:
  Revised implementation of energy balance to avoid having to use conditionally removed models.
- July 27, 2010, by Michael Wetter:
  Redesigned model to fix bug in medium balance.
- July 5, 2010, by Michael Wetter:
  Changed `assert(dp_in >= 0, ...)` to `assert(dp_in >= -0.1, ...)`. The former implementation triggered the assert if `dp_in` was solved for in a nonlinear equation since the solution can be slightly negative while still being within the solver tolerance.
- March 24, 2010, by Michael Wetter:
  Revised implementation to allow zero flow rate.
- October 1, 2009, by Michael Wetter:
  Added model to the Annex60 library.

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