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Investigation of a swing compressor concept with medium-pressure injection for electrified vehicles.

Number: 2241

Author(s) : BAUMGART R., AURICH J., HOHMANN F., RESCH R.

Summary

Modern electric vehicles have very complex thermal management systems where the temperature of both the cabin and the battery is controlled by the refrigerant circuit. In addition, the electronic control units in highly automated and future autonomous vehicles also need to be cooled. However, some of these components have significantly different requirements regarding their cooling capacities and temperatures. But today’s automotive refrigerant circuits can only provide one low-pressure level and thus evaporation temperature level, which makes compromises necessary regarding the temperature and cooling capacity.
For efficient thermal management, it would therefore be much more effective, if the refrigerant circuit could also provide an additional medium-pressure level (= medium-temperature level) in addition to the low-pressure level. However, this is not possible with standard automotive air conditioning compressors. The current compressors have only one low-pressure inlet and one high-pressure outlet, and it is not possible, to feed a sufficient medium-pressure mass flow rate into the compressor during the compression phase.
For this reason, a concept for an automotive air conditioning compressor with a medium-pressure inlet is currently under development. This concept is based on a conventional two-cylinder swing compressor (e.g., Yamamoto, 2014), which is cost-effective and may have a durable design. Additionally, it is well suited for sustainable refrigerants like R744.
The compressor concept and the operating principle are presented in section 2 of this contribution. By means of a simulation model described in section 3, the processes in the compressor are analyzed. The results are discussed in section 4 and finally the compressor concept is evaluated. The investigations have shown that this concept enables significant medium-pressure mass flow rates, which offers some advantages for a demand-based thermal manage-ment in future vehicles. The advantages using this compressor integrated in a thermal management system are investigated in a parallel paper (Aurich, 2024).

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  • Original title: Investigation of a swing compressor concept with medium-pressure injection for electrified vehicles.
  • Record ID : 30033094
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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