Submission
Influence of refrigerant and compressor construction forms on efficiencies assessed by dynamic simulation models
DOI: 10.18462/iir.compr.2021.0388
Session: Rotary, scroll, screw compressors 1
Accept state: Submission accepted
Authors
| Name | Organization | |
|---|---|---|
| Christian Vering | RWTH Aachen | |
| Christian Schwenzer | RWTH Aachen | |
| Stephan Göbel | RWTH Aachen | |
| Valerius Venzik | RWTH Aachen | |
| Markus Nürenberg | RWTH Aachen | |
| Dirk Müller | RWTH Aachen |
Abstract
The compressor’s performance is crucial for an efficient heat pump operation. In order to compare different refrigerants thermodynamically, efficiencies are often assumed constant and the influence of the construction form is neglected. The resulting steady-state comparisons allow first system in-sights without conducting expensive experiments. In dynamic operation, however, efficiencies vary due to compressor’s rotational speed and its pressure ratio. This leads to different insights compared to previous steady-state results.
We present an open-source one-dimensional physical compressor model for a rolling type piston and a reciprocating piston compressor in Modelica. It calculates both isentropic and volumetric efficiency depending on refrigerant, construction form and operating point. Analysing all results, we prove our modelling approach to be valid.
In conclusion, we apply the model to better understand the compression process in heat pump applications. Furthermore, regarding the design, different mechanical adjustments can be tested in the simulation model to estimate their performance impact.
Keywords
dynamic simulation model, thermodynamic modelling, refrigerant and construction form evaluation