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Comparison and evaluation of injector structures for air conditioning systems in electric cars.

Number: 2240

Author(s) : AURICH J., BAUMGART R.

Summary

Aside from the obligatory thermal comfort in the passenger compartment, cruising range and short charging times are the key factors for prospective customers, as well as for the widespread distribution of electric vehicles. Modern electric vehicles are usually equipped with a thermal management system, which basically consists of a refrigerant circuit and at least one water circuit. These circuits are thermally coupled with a chiller.
In the low-pressure area of the refrigerant circuit, the refrigerant flows in parallel through the evaporator to cool the passenger compartment and the chiller to control the temperature of the battery and other components. However, today's vehicle systems only have one low-pressure level, which means that only one refrigerant temperature is available for all components that need to be cooled. However, the cooling requirements for the passenger compart-ment and the vehicle components sometimes differ significantly, which means that compromises must be made with the cooling temperature provided.
This problem could be solved with an additional pressure level, in which a partial mass flow of the high-pressure refrigerant is expanded to a medium pressure and thus to a medium evaporation temperature to feed the chiller. Of course, this requires a special refrigerant compressor with an injection port, which is currently the subject of development work, too.
This article compares different circuit topologies with medium-pressure injection with the systems commonly used today. The advantages and disadvantages of the systems are shown and evaluated in detail using simulation results. In addition, the comparison includes established circuit structures such as Flash Tank, Economizer or Liquid Injection, which enable efficient use of the medium-pressure compressor inlet even when only the chiller or the evaporator is active. The investigations are carried out for various ambient conditions, whereby the optimization potential of the individual systems is also highlighted. Finally, an outlook on further investigations and development work is given.

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Pages: 10 p.

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Details

  • Original title: Comparison and evaluation of injector structures for air conditioning systems in electric cars.
  • Record ID : 30033093
  • 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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