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Automated optimization of variable back-pressure of scroll compressors across the entire operation envelope.

Number: 1154

Author(s) : BUSCH C., ÖTTL M.

Summary

In the course of the electrification of vehicle drives, the requirements for thermal management systems are currently being redefined completely. This has a significant impact on the operating envelope of the compressor as the most important component in them. In addition to standard A/C operation, large cooling capacities and mass flows at high evaporation temperatures are needed for fast charging, while heat pump mode is characterized by low suction pressures and high pressure ratios. These new tasks significantly increase the required stable pressure and speed ranges of scroll compressors, which are de facto standard in most electrified mobile applications. A particularly complex engineering task and potentially major time bottleneck is tuning a variable back-pressure system, which most modern scroll compressors rely on for axial compliance between fixed and orbiting scroll. Natural refrigerants, especially the transcritical use of R744, for example, require an even more precise back-pressure tuning than usual. The work at hand will show how ultra-fast exact analytical geometry calculations and 1D thermodynamic flow simulations are combined in a fully automated optimization process to solve the task of ensuring proper back-pressure over the entire operating envelope of a scroll compressor. To have such an efficient and lean simulation toolchain is the key to being able to react in an environment of ever-changing boundary conditions and allows rapid development and investigation of new machine concepts and variants.

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  • Original title: Automated optimization of variable back-pressure of scroll compressors across the entire operation envelope.
  • Record ID : 30033009
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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