Module based energy systems models - Boiler

[DaJansenGit]

This is related to #1147 and we will define the remaining todos for the integration of the boiler model here

ToDos:

• Check efficiency model parametrization and data to parametrize minimal part load
• Go to 5D - model?

Documentation:

• AixLib.Fluid.BoilerCHP.BaseClasses.Controllers.NominalPowerDemand: finish docs and prompt why we have this workaround
  • nominalLosses: specify why 0.3 % as fixed value, also document (or change) this for G value of BoilerGeneric ambient heat losses
• add icons to all used submodels to easily identity the usage of the models
• AixLib.Fluid.BoilerCHP.BoilerNotManufacturer finish docs, point out the idea of the model, link the upcoming paper (preprint) or graphics from presentation at TGAKongress
  • add current limitations: initial miscalculations if return temperature hasn't reached set return temperature yet (happens only if system is not correctly initialized)

Model improvements:

• Boundaries and SDF interpolation/extrapolation: For boiler we set a minimal FirRat as protected and
• add an assert, so no changes are possible. So no extra- or interpolation is needed
  • for heatpumps there will be a different approach

Controls

• optional heating curve control on module level (if deactived, flow set temperature MUST be provided, if both are provided, through an assert)
  • what kind of function to use by default? What does BESMOD use?
• calc on/off time dynamically based on thermal capacity / capacity
• use Moritz PI parameter calculation based on model parameters
• Add block pump control with constant output (1)

Examples/Validation:

• We add a simple example to the BoilerGeneric
• We add validation models for 4-5 boilers configured based on data sheet and add "measured" data for efficiency and show how the efficiency of the approach behaves compared to the data sheet efficiency

Naming

• the model will be named BoilerGeneric

Cleanup:

• delete AixLib.Fluid.BoilerCHP.BoilerHeatingHotWater