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Development of energy-efficient refrigeration oil for refrigerator using R600a.

Number: 1185

Author(s) : TAKAKI T., NAKAJIMA T., ANDO M., NARA F.

Summary

Isobutane (R600a) is an eco-friendly refrigerant with zero ozone depletion potential (ODP) and low global warming potential (GWP), and has been widely used for household refrigerators. Refrigeration oils are applied in the refrigeration cycle together with the refrigerant to lubricate the compressor. Following the global trend aiming for sustainability, both energy efficiency and compatibility with R600a are needed for the refrigeration oils. Among the components in the household refrigerator, the compressor has the largest impact on power consumption. The reciprocating compressor consisting of a cylinder and piston is generally used, and the viscous resistance is reduced when the viscosity of the refrigerator oil is low. As a result, the low viscosity oil improves the coefficient of performance (COP) in the refrigeration system. Mineral oil-based refrigerator oils are commonly used for R600a considering the compatibility. Although their kinematic viscosity is commonly between 5 and 8 mm2/s at 40°C so far, further improvement in COP is required. In this study, we have developed a refrigeration oil with a kinematic viscosity of 3 mm2/s at 40°C. While the low viscosity leads to low friction loss, it potentially causes wear or seizure damage on the sliding parts due to the thinner oil film. The additive formulation technology is essential to deal with the issue.

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  • Original title: Development of energy-efficient refrigeration oil for refrigerator using R600a.
  • Record ID : 30030274
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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