The Influence of Oil on the Evaporation Heat Transfer of R-600a Refrigerant inside a Micro-Fin Tube within Inserts

Mao Yu Wen; Kang Jang Jang

doi:10.4028/www.scientific.net/AMR.538-541.2086

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 538-541The Influence of Oil on the Evaporation Heat...

The Influence of Oil on the Evaporation Heat Transfer of R-600a Refrigerant inside a Micro-Fin Tube within Inserts

Abstract:

Evaporation of refrigerant-oil mixture was studied in a smooth and micro-fin tube without / with four different inserts (twined coil, wire coil, twisted tape, and helical-coil). The refrigerant was R-600a and the oil was the EMKARATE RL 32H with a viscosity 150 SUS. The test was conducted at a saturation temperature of 15 , vapor qualities from 0.1 to 0.49, inlet oil concentration from 0 to 5 mass% oil, mass flux of 200 – 500 and heat flux of 10.24 . The enhancement factor (EFs) is larger for the lower oil concentration (at l %), while the ratios for the higher oi1 concentration (at 5%) are generally smaller than l and decreased rapidly as the oil concentration increased. In addition, new correlations to estimate the evaporation heat transfer coefficients for the R-600a mixed with the lubricating oil in micro-fin tube containing different inserts have been developed.

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Periodical:

Advanced Materials Research (Volumes 538-541)

Pages:

2086-2089

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.538-541.2086

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Online since:

June 2012

Authors:

Mao Yu Wen, Kang Jang Jang

Keywords:

Correlation, Evaporation Enhancement Factor, Micro-Fin Tube within Insert, R-600a, Refrigerant-Oil Mixtures

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