modelBuck_R134aR450aR1234yfR1234zee_VarDisVol_ReciprocatingRotaryScroll
Reciporating/Rotary/Scroll Compressor - R134a, R450a, R1234yf, R1234ze(e) - Similitude - Power
Extends from PowerEngineEfficiency (Model describing flow engine efficiency on power approach).
Information
This model contains a calculation procedure for the engine efficiency
presented by Mendoza-Miranda et al. (2016).
| Reference | Formula | Refrigerants |
Validity ncompressor
|
Validity Πpressure
|
|---|---|---|---|---|
| MendozaMirandaEtAl2016 |
ηeng = 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 |
|---|---|---|---|
| Boolean | useIseWor (from PartialEngineEfficiency) | false | = true, if isentropic work is used to compute compressor's power consumption |
| Modelling approach | |||
| Types.EnginePowerModels | powMod (from PowerEngineEfficiency) | Types.EnginePowerModels.MendozaMirandaEtAl2016 | Chose predefined power model for flow coefficient |
| Real | a (from PowerEngineEfficiency) | Multiplication factor for generic power approach | |
| Real[:] | b (from PowerEngineEfficiency) | Exponents for each multiplier | |
| Integer | nT (from PowerEngineEfficiency) | size(b, 1) | Number of terms used for the calculation procedure |
| Reference properties | |||
| Modelica.Units.SI.MolarMass | MRef (from PowerEngineEfficiency) | 0.1 | Reference molar wheight |
| Modelica.Units.SI.Frequency | rotSpeRef (from PowerEngineEfficiency) | 9.334 | Reference rotational speed |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Efficiency | epsRef (from PartialEfficiency) | Ratio of the real and the ideal displacement volume | |
| Modelica.Units.SI.Volume | VDis (from PartialEfficiency) | Displacement volume | |
| Real | piPre (from PartialEfficiency) | Ratio of compressor's outlet and inlet pressure | |
| Modelica.Units.SI.Frequency | rotSpe (from PartialEfficiency) | Compressor's current rotational speed | |
| Medium.ThermodynamicState | staInl (from PartialEfficiency) | Thermodynamic state at compressor's inlet | |
| Medium.ThermodynamicState | staOut (from PartialEfficiency) | Thermodynamic state at compressor's outlet | |
| Modelica.Units.SI.Temperature | TAmb (from PartialEfficiency) | Ambient temperature | |
| Modelica.Units.SI.Efficiency | etaEng (from PartialEngineEfficiency) | Overall engine efficiency | |
| Real[nT] | p (from PowerEngineEfficiency) | Array that contains all coefficients used for the calculation procedure | |
| Real[2] | corFac (from PowerEngineEfficiency) | Array of correction factors used if efficiency model proposed in literature differs from efficiency model defined in PartialCompressor model |
Revisions
- October 23, 2017, by Mirko Engelpracht:
First implementation (see issue 467).