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A new refrigerant drying method in an automotive air-conditioning system using R134a.

Author(s) : KITAMURA K., OHARA T., HONDA S., SAKAKIBARA H.

Summary

The behaviour of water in the refrigerating cycle of automotive air conditioners that use R134a (a hydrofluorocarbon) was experimentally investigated in detail. The saturated water content in the gas phase of R134a was determined. The water content at both the inlet and outlet of the expansion valve and in the evaporator was measured in detail. These results showed that when the water content at the inlet of the valve was more than 500 ppm, water condensation (hereinafter called free water) occurred in the gas phase during evaporation, although no free water occurred in either the gas or liquid phase at the outlet of the valve. Conditions of test are given. Based on these results, a new refrigerant drying technology was developed. With this method, free water could be generated again by cooling part of the superheated gaseous refrigerant coming out of the evaporator. This water could then be filtered and discharged into the atmosphere by employing a water-selective permeation membrane.

Details

  • Original title: A new refrigerant drying method in an automotive air-conditioning system using R134a.
  • Record ID : 1994-1190
  • Languages: English
  • Source: ASHRAE Transactions 1993.
  • Publication date: 1993
  • Document available for consultation in the library of the IIR headquarters only.

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