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The influence of non-condensable gases on the thermal-acoustic behavior of household refrigerators.

Number: pap. 2057

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

Summary

In refrigeration systems with evaporating pressure lower than atmospheric pressure, air from the ambient can infiltrate into the circuit through small leaks in the suction line. Additionally, if a problem occurs during the evacuation process on the production line, residual air might be left inside the circuit. This paper reports an experimental study on the influence of non-condensable gases on the thermal-acoustic behavior of a household refrigeration system. Controlled amounts of nitrogen were injected into the system through a purpose-built device. Steady-state energy consumption tests were carried with different nitrogen mass fractions inside the circuit at compressor speeds of 2500, 3000 and 4000 RPM. In addition, acceleration signals were captured by an accelerometer installed at the evaporator inlet simultaneously with images of the flow at the capillary tube inlet. It was found that for very low nitrogen mass fractions the system performance was not affected and in some cases was slightly improved. However, for high nitrogen mass fractions, large fluctuations in the flow pattern at the capillary tube inlet and in the acceleration readings were observed resulting in a worse system performance. Furthermore, a high sub-cooling degree at the filter dryer was a strong evidence of the presence of non-condensable gases.

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Pages: 9

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Details

  • Original title: The influence of non-condensable gases on the thermal-acoustic behavior of household refrigerators.
  • Record ID : 30018883
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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