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A comparison of the heat transfer and pressure drop performance of R134a-lubricant mixtures in different diameter smooth tubes and micro-fin tubes.

Author(s) : ECKELS S. J., DOERR T. M., PATE M. B.

Summary

The performance benefits of the tubes with 12.7 mm outer diameter are compared to those of smaller tubes with 9.52 mm outer diameter. The lubricant used was a 170 SUS penta erythritol ester mixed-acid lubricant. The lubricant concentration was varied from 0 to 5.1% in the mixture. The average heat transfer coefficients in the 12.7 mm micro-fin tube were 50 to 150% higher than those for the 12.7 mm smooth tube, while pressure drops in the micro-fin tube were 5 to 50% higher than in the smooth tube.

Details

  • Original title: A comparison of the heat transfer and pressure drop performance of R134a-lubricant mixtures in different diameter smooth tubes and micro-fin tubes.
  • Record ID : 1999-2833
  • Languages: English
  • Source: ASHRAE Transactions. 1998 Winter Meeting, San Francisco, CA.
  • Publication date: 1998
  • Document available for consultation in the library of the IIR headquarters only.

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