modelPowerEngineEfficiency
Extends from PartialEngineEfficiency.
Information
This model contains a calculation procedure for engine efficiency models (for more information, please check out AixLib.Fluid.Movers.Compressors.BaseClasses.PartialCompression). The calculation procedures based on a power approach are presented below.
Implemented approaches
Actually, one power approache is implemented in this package. To add
further calculation procedures, just add its name in AixLib.Fluid.Movers.Compressors.Utilities.Types
and expand the if-structure.
| Reference | Formula | Refrigerants |
Validity ncompressor
|
Validity Πpressure
|
|---|---|---|---|---|
| MendozaMirandaEtAl2016 |
ηeng = a1 * π^b1 * (nref/n)^b2 *
(1/((TInl+TOutIse)/2-TOut))^b3
* (Mref/M)^b4
|
R134a,R450a,R1324yf,R1234ze(E) |
0 - 50
|
1 - 6
|
References
J.M. Mendoza-Miranda, A. Mota-Babiloni, J.J. Ramírez-Minguela, V.D. Muñoz-Carpio, M. Carrera-Rodríguez, J. Navarro-Esbrí and C. Salazar-Hernández (2016): Comparative evaluation of R1234yf, R1234ze(E) and R450A as alternatives to R134a in a variable speed reciprocating compressor. In: Energy 114, S. 753–766
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelling approach | |||
| Types.EnginePowerModels | powMod | Types.EnginePowerModels.MendozaMirandaEtAl2016 | Chose predefined power model for flow coefficient |
| Real | a | Multiplication factor for generic power approach | |
| Real[:] | b | Exponents for each multiplier | |
| Integer | nT | size(b, 1) | Number of terms used for the calculation procedure |
| Reference properties | |||
| Modelica.Units.SI.MolarMass | MRef | 0.1 | Reference molar wheight |
| Modelica.Units.SI.Frequency | rotSpeRef | 9.334 | Reference rotational speed |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real[nT] | p | Array that contains all coefficients used for the calculation procedure | |
| Real[2] | corFac | Array of correction factors used if efficiency model proposed in literature differs from efficiency model defined in PartialCompressor model |
Revisions
- October 20, 2017, by Mirko Engelpracht:
First implementation (see issue 467).