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Geometric optimization of scroll compressors.

Number: pap. 1435

Author(s) : BAUMGART R., GELKE W., AURICH J., et al.

Summary

Electric driven scroll compressors are widely used for the A/C systems in electric vehicles. Besides many other advantages, scroll compressors offer comparable good efficiencies and can be easily used in both the refrigeration and heat pump mode. Scroll compressors were first introduced in the early 20th century. Over the decades they have been further developed and optimized and became increasingly efficient. Among other things, numerical simulations contributed to this process. However, most of the studies focus on the optimization of the scroll wraps and their design. Investigations concerning the design and the positioning of the pre-outlet and main outlet bores are rarely present. Therefore, this contribution focuses on the optimization of the pre- and main outlet positions of scroll compressors by means of a geometrical and physical based simulation model. The first part outlines a brief introduction of the simulation model as well as the applied parameters. Subsequently, different positions of the pre- and main outlet bores for an exemplary CO2-scroll compressor with a variable wall thickness are investigated. The main focus is on their influence on the required driving power, the pressure behavior in the chambers and the mass flow rate. The investigations clarify that with an appropriate positioning of the pre- and main outlet bores the internal over-compression at low load and partial load operating points can be avoided. Simultaneously, the maximum chamber pressure at high load operating points is significantly reduced, which leads to a lower oil temperature as well as a reduction of the required driving power.

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Pages: 10

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Details

  • Original title: Geometric optimization of scroll compressors.
  • Record ID : 30024354
  • Languages: English
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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