A study on the flow characteristics of refrigerating oil dissolved with refrigerant.

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  • 冷媒の溶解した冷凍機油の流動特性の研究
  • レイバイ ノ ヨウカイシタ レイトウキユ ノ リュウ ドウトクセイ ノ ケンキ

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Abstract

In a refrigerating compressor, refrigerating oil lubricates moving parts and seals clearances. But its characteristics are much affected by the presence of the refrigerant. This study analysed the channel flow characteristics of refrigerating oil dissolved with refrigerant 22. In theoretical analyses the apparent properties of the flow were estimated ; and using them, the flow was modelled as a single phase flow. The pressure and temperature profiles at the channel and the flow rate were calculated theoretically and compared with experimental results which were measured using a model channel (height : 62 μm, length : 40 mm). The falling gradient of the pressure in the channel became large as the flow progressed because of the dissociation of refrigerant vapor from the refrigerating oil. The heat needed to dissociate the refrigerant was about 105 kJ/kg. The dissociation of the refrigerant increased the viscosity of the refrigerating oil, which caused the decrease of the flow rate.

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