summary
Created Tuesday 23 September 2014
CONCEPT: FOR AUTOMATIC TRACKING OF EFFICIENCY:
- yield powers, effort powers and auxiliary powers passing the model's boundaries shall be summed up in a summing component
- only models of the components package have this feature (other classes are considered to be more basic in concept)
- some elements may have a flag indicating whether they shall contribute to the summing component or not:
parameter Boolean contributeToCycleSummary = true "True if component shall contribute to automatic efficiency calculation" annotation(Dialog(tab="Summary and Visualisation"));
- boundaries have a parameter called energyType which defines how the energy flow is handled for efficiency calculation:
- energy is effort: energy is used as energy input to the cycle (fuel, heating mass flows)
- energy is profit: energy is used as a product of the cycle (district heating system, process steam)
- energyis loss: energy is not considered in efficiency calculation
- different efficiency calculations are implemented:
- eta_gross: gross efficiency without auxiliary power
- eta_net: net efficiency regarding auxiliary power
- eta_util: utilization efficiency regarding auxiliary power and thermal power output (e.g. district heating system)
- spec_heat_cons: specific heat consumption of the cycle (1/eta_gross * 3600) [kJ/kWh]
- if a heat input/output is modeled with boundaries please make sure to set boundaries belonging together to the same energyType so that the difference in energy flows between those boundaries is used for a correct calculation of the efficiencies
Definitions
- powerIn: heat input to the thermodynamic cycle. Examples: heated pipes, steam generators (simple models), auxiliary steam input
- powerOut_th: thermal output of the process for example district heating
- powerOut_elMech: electric or mechanic power output of the process, for example turbines and generators
- powerAux: input from auxiliary equipment , for example pumps, fans and motors
Future Works
- losses may be tracked additionally
- exergy flows may also be tracked in the summing component
- losses from a combustion process shall be tracked in the future
Backlinks: ClaRa:SimCenter