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A study on the reduction of throttling losses in automotive air-conditioning systems through expansion work recovery.

Author(s) : GONÇALVES V. de A., PARISE J. A. R.

Summary

Refrigerant flow control of the vapour compression refrigeration cycle has been largely relied upon throttling devices, such as capillary tubes, short tube orifices and expansion valves. The expansion process through these devices represents an obvious thermodynamic loss that can be mitigated by the application of different solutions such as intracycle evaporative cooling, economizer and ejector cycles or work producing expansion devices. This paper concentrates on studying the latter, specifically applied for automotive air-conditioning systems. A basic thermodynamic model was developed to simulate a vapour compression cycle for automotive air-conditioning purposes employing expanders. Data and cycle conception from devices that were successfully tested and reported in the literature are briefly commented. A preliminary study was carried out taking into account some of the several characteristics that are inherent to mobile air conditioning systems, including high rejection temperature. This preliminary study concentrated in the subcritical vapour compression R-134a cycle with an expander and a thermostatic expansion valve placed downstream the expander.

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Details

  • Original title: A study on the reduction of throttling losses in automotive air-conditioning systems through expansion work recovery.
  • Record ID : 2009-1768
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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