Effects of Pressure and a Microporous Coating on HFC-245fa Pool Boiling Heat Transfer: Paper No. HT-13-1510

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Abstract

A study was conducted to experimentally characterize the pool boiling performance of hydrofluorocarbon HFC-245fa at pressures ranging from 0.15MPa to 1.1MPa (reduced pressure range: 0.04-0.31). Pool boiling experiments were conducted using horizontally oriented 1-cm2 heated surfaces to quantify the effects of pressure and a microporous-enhanced coating on heat transfer coefficients and critical heat flux (CHF) values. Results showed that the coating enhanced heat transfer coefficients and CHF by 430% and 50%, respectively. The boiling heat transfer performance of HFC-245fa was then compared with the boiling performance of HFC-134a and hydrofluoroolefin HFO-1234yf.

Original languageAmerican English
Article number101502
Number of pages9
JournalJournal of Heat Transfer
Volume136
Issue number10
DOIs
StatePublished - Oct 2014

NREL Publication Number

  • NREL/JA-5400-62161

Keywords

  • Boiling heat transfer
  • Critical heat flux
  • HFC-245fa
  • Microporous coating

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