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Investigation of the pressure behaviour with compressor speed for an R-134a automobile air-conditioning system.

Author(s) : CHEN Y., GU J., WANG S.

Summary

Compressor speed plays an important role in performance of automobile air-conditioning systems. This paper is focused on how it affects the mass flow rate and then the discharge pressure and the intake pressure. An accurate correlation which takes into account oil effect was developed to calculate thermophysical properties of R-134a/PAG oil mixture. Experimental results showed that the intake pressure change is nearly proportional to the mass flow rate, while the discharge pressure change is of second order. These relationships cover temperature of conditioned zone ranging from 25 to 35°C and compressor speed from 700 to 2000 rpm. Experimental correlations between the mass flow rate, the intake pressure, the discharge pressure, and the compressor speed were developed, which agree well with experimental results with maximum prediction error being less than 5%. The correlations provide an in-depth understanding on the pressure behaviour and can be used in both simulation and optimization for automobile air-conditioning systems.

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Pages: ICR07-E1-1210

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Details

  • Original title: Investigation of the pressure behaviour with compressor speed for an R-134a automobile air-conditioning system.
  • Record ID : 2008-0844
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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