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Non-condensable gases and their effect on the dynamic behavior of domestic refrigerators.

Number: pap. 2127

Author(s) : ESPÍNDOLA R., KNABBEN F. T., MELO C.

Summary

The aim of this work was to experimentally investigate the effect of non-condensable gases on the thermal acoustic behavior of domestic refrigerators under dynamic conditions. To this end, an acrylic made filter dryer was installed in the system for a proper visualization of the refrigerant flow at the capillary inlet. An accelerometer was also installed at the evaporator inlet to capture vibrations/noise signals, caused by the refrigerant flow pattern at the inlet of the expansion device. During the experiments the energy consumption was measured with the system systematically doped with precise amounts of nitrogen. It has been found that the energy consumption increased up to 25.9%, when a mass fraction of 0.43% of N2 was added to the system. Moreover, it has been found that the energy consumption increases almost linearly with the N2 mass fraction. Pull-down tests were also carried out, showing a clear relationship between the N2 amount and the power and mass flow rate oscillations, soon after the compressor start-up, caused by the unbalance between the compressor and capillary tube mass flow rates. It could also be observed that the expansion noise increased when liquid was admitted in the capillary, due to the increased mass flow rate.

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Pages: 8

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Details

  • Original title: Non-condensable gases and their effect on the dynamic behavior of domestic refrigerators.
  • Record ID : 30024408
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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