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Visualization of the refrigerant flow at the capillary tube inlet of a household refrigeration system.

Number: pap. 2228

Author(s) : MARTÍNEZ-BALLESTER S., BARDOULET L., PISANO A., et al.

Summary

Subcooled conditions at the condenser outlet ensure complete condensation, which is necessary to increase the cooling capacity and ensure the liquid conditions at the expansion device inlet in vapor compression systems. However, in household refrigerators, recent works point out the presence of two-phase flow at the capillary tube inlet. These systems behave quite different from others refrigeration systems due to the extreme low capacity, about 80 W. In the present work, a test bench was built to visualize the refrigerant flow the capillary tube inlet of a household refrigerator. Three transparent filters were installed with different orientations and different positions of the capillary tube within them were tested. The tests allowed visualizing clearly the refrigerant conditions at the capillary tube inlet. In addition, the temperature profile along the condenser wall was analyzed. The results show that, for the refrigerator analyzed, the capillary tube always draws in two-phase flow in steady conditions. The temperature profile and other factors analyzed pointed out to the fact that there is not effective subcooling in this appliance.

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Pages: 8 p.

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Details

  • Original title: Visualization of the refrigerant flow at the capillary tube inlet of a household refrigeration system.
  • Record ID : 30013509
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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