Nucleate boiling heat transfer coefficients of flammable refrigerants on various enhanced tubes

Jung, Dongsoo; Lee, Heungseok; Bae, Dongsoo; Ha, Jongchul

doi:10.1016/j.ijrefrig.2004.07.024

Cited by 20 publications

(5 citation statements)

References 7 publications

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“…For Jung et al [32] the enhancement factors were calculated using their data for plain tubes presented in Jung et al [37]. The correlation proposed by Gorenflo [35] was not used here due to the fact that the empirical constants of various fluids in Table 1 (isobutene, FC-72, propylene, dimethylether) were not provided.…”

Section: Previous Studies (From 2000 Onward)mentioning

confidence: 99%

Nucleate boiling heat transfer of R134a on enhanced tubes

Ribatski

Thome

2006

Applied Thermal Engineering

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Section: Previous Studies (From 2000 Onward)mentioning

confidence: 99%

Nucleate boiling heat transfer of R134a on enhanced tubes

Ribatski

Thome

2006

Applied Thermal Engineering

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“…The available data for other HC refrigerants and their blends are still very limited. According to the measurements by Jung et al [83] (Fig. 10), the Themoexcel-E tube also gave the best HTC enhancements for R1270, R600, and RE170, with F E up to approximately 8.4, 8.1, and 8.9, respectively.…”

Section: Measurements For Low-gwp Refrigerants On Enhanced Surfacesmentioning

confidence: 77%

“…The low-fin tube shows a relatively lower enhancement factor ranging between 1.2 and 2.4. Jung et al [83] also found that the enhancement factor for the HC refrigerants were up to 40% greater than those of HFC refrigerants for low heat fluxes, but exhibited similar ones for high heat fluxes.…”

Section: Measurements For Low-gwp Refrigerants On Enhanced Surfacesmentioning

confidence: 99%

“…Pool boiling HTCs of R1270, R290, R600a, R600, and RE170 on (a) low fin tube, (b) Turbo-B tube, and (c) Thermoexcel-E tube. (from Jung et al [83]).…”

Section: Figmentioning

confidence: 99%

“…Jung et al [83] measured the boiling heat transfer of four hydrocarbon refrigerants (R1270, R290, R600a, and R600), and one ether (RE170) 3 for three commercial enhanced tubes (low-fin tube, Turbo-B, and Thermoexcel-E) at a saturation temperature of 7 °C and for heat fluxes between 10 kW/m 2 and 80 kW/m 2 . The measured HTCs are shown in Fig.…”

Section: Measurements For Low-gwp Refrigerants On Enhanced Surfacesmentioning

confidence: 99%

See 2 more Smart Citations

Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Lin

Kedzierski

2019

International Journal of Heat and Mass Transfer

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Global warming mitigation efforts have stimulated investigations of a new generation of low-GWP refrigerants. Because some of the proposed low-GWP refrigerants have unfavorable characteristics (e.g., flammability and toxicity), a small refrigerant charge is desirable. Compact heat exchangers with enhanced surfaces facilitate small refrigerant charge by having a large heat exchanger surface area to heat exchanger volume ratio. This paper reviews the current state-of-the-art for pool boiling heat transfer of low-GWP refrigerants on enhanced surfaces. An overview for the enhanced surface manufacturing technique is given along with detailed reviews of the heat transfer measurements and predictions for many of the low-GWP refrigerants, including the hydrofluoroolefin (HFO) class, the hydrocarbon (HC) class, carbon dioxide (CO2), and ammonia (NH3). The overview of the predictive methods includes mechanistic models and correlations for pool boiling on enhanced surfaces. Based on the surveyed literature, existing shortfalls are identified and suggestions for future studies are proposed.

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