A study of pool boiling heat transfer on horizontal tubes in R-245fa/oil mixture

Liang Han Chien, Yueh Lin Tsai, Ching Hung Chang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The study investigates the boiling heat transfer performance of pure R-245fa and mixtures with lubricant RL-150S (approximate 1%, 2% and 5% lubricant mass fraction). Two kinds of tubes, a smooth tube and a fin tube of 0.4mm fin height, 60FPI(Fins Per Inch) were tested. Experiments were performed at saturation temperatures of 5 and 20°C, and heat fluxes varied from 6 to slightly above 50kW/m2. Different effects of oil are shown in the pool boiling heat transfer for the smooth and fin tubes. The bubble size and the heat transfer coefficient of smooth tube decreases with increasing oil concentration. For the fin tube, the heat transfer coefficient increases with increasing oil concentration. The nucleation site density increases with the oil concentration for both the smooth tube and the fin tube. The oil concentration is measured by a refractive index sensor. The oil concentration 15 mm under the boiling surface remains steady with varying heat flux for both smooth and fin tube.

Original languageEnglish
Title of host publication24th IIR International Congress of Refrigeration, ICR 2015
PublisherInternational Institute of Refrigeration
Pages770-777
Number of pages8
ISBN (Electronic)9782362150128
DOIs
StatePublished - 2015
Externally publishedYes
Event24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
Duration: 16 08 201522 08 2015

Publication series

NameRefrigeration Science and Technology
ISSN (Print)0151-1637

Conference

Conference24th IIR International Congress of Refrigeration, ICR 2015
Country/TerritoryJapan
CityYokohama
Period16/08/1522/08/15

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