In-tube evaporation of HCFC-22 in a 9.52 mm micro-fin/smooth tube

Kuo, C. S.; Wang, Chi-Chuan

doi:10.1016/0017-9310(95)00326-6

Cited by 55 publications

(16 citation statements)

References 10 publications

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“…At the moderate quality region, heat transfer coefficients increase with increasing mass flux and vapor quality. This is similar to the results reported by Kuo-Wang [9], who used R-22 in a 9.52 mm tube. The effect of mass flux on the heat transfer coefficient appears at moderatehigh vapor quality of around 0.4-0.6.…”

Section: Data Reductionsupporting

confidence: 91%

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Two-phase flow heat transfer of propane vaporization in horizontal minichannels

Pamitran

Choi

et al. 2009

J Mech Sci Technol

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Experiments were performed on the convective boiling heat transfer in horizontal minichannels using propane. The test section was made of stainless steel tubes with inner diameters of 1.5 mm and 3.0 mm and lengths of 1000 mm and 2000 mm, respectively, and it was uniformly heated by applying an electric current directly to the tubes. Local heat transfer coefficients were obtained for a heat flux range of 5-20 kW m -2 , a mass flux range of 50-400 kg m -2 s -1 , saturation temperatures of 10, 5, and 0°C and quality ranges of up to 1.0. The nucleate boiling heat transfer contribution was predominant, particularly at the low quality region. Decreases in the heat transfer coefficient occurred at a lower vapor quality with a rise of heat flux and mass flux, and with a lower saturation temperature and inner tube diameter. Laminar flow appeared in the minichannel flows. A new boiling heat transfer coefficient correlation that is based on the superposition model for propane was developed with 8.27% mean deviation.

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Section: Data Reductionsupporting

confidence: 91%

“…The trend illustrated in Fig. 3 agrees with previous studies, e.g., Kew and Cornwell [6], Yan et al [12], and Kuo-Wang [9]. Fig.…”

Section: Data Reductionsupporting

confidence: 89%

Two-phase flow heat transfer of propane vaporization in horizontal minichannels

Pamitran

Choi

et al. 2009

J Mech Sci Technol

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“…The average inner wall temperature T w.iJl, is determined from Tw,out employing coefficients of R-22 as a function of mass flux at a heat flux of 5 kW1m 2 • As expected, the heat transfer coefficient increased with mass flux, and it was strongly dependent on mass flux. These trends were also reported in most previous studies (Kuo and Wang, 1996;Schlager et al, 1990;Wijaya and Spatz, 1995). Generally, for the lower evaporating temperature and higher mass flux, the higher values of heat transfer coefficient were observed in the present experiments.…”

Section: Resultssupporting

confidence: 76%

An experimental study on convective boiling of R-22 and R-410A in Horizontal smooth and micro-fin tubes

Kim

Lee

Park

2001

KSME International Journal

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Evaporation heat transfer coefficients and pressure drops were measured for smooth and micro-fin tubes with R-22 and R-41OA. Heat transfer measurements were performed for 3.0 m long horizontal tubes with nominal outside diameters of 9.52 and 7.0 mm over an evaporating temperature range of -15 to 5°C, a mass flux range of 68 to 211 kg/rrr's, and a heat flux range of 5 to 15 kW/m 2 • It was observed that the heat transfer coefficient increased with mass flux. Evaporation heat transfer coefficients of R-22 and R-41OA increased as the evaporating temperature dropped at a lower heat flux. Generally, R-41OA showed the higher heat transfer coefficients than R-22 in the range of low mass flux, high heat flux and high evaporating temperature. Pressure drop increased with a decrease of evaporating temperature and a rise of mass flux. Pressure drop of R-22 was higher than that of R-41OA at the same mass flux.

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“…Micro-fin tubes have been successfully implemented in the two-phase flow of refrigerants for effective tube-side performance. This success is because of their ability to significantly improve the heat transfer coefficient [26][27][28][29] with only a moderate increase of the friction penalty. The passage geometry of the corrugated tube differs from the microfin tubes by virtue of having corrugations on both inner and outer surfaces.…”

Section: Literature Reviewmentioning

confidence: 99%

Double tube heat exchanger with novel enhancement: part 3—convective condensation

Tiruselvam¹,

Chin²,

Raghavan³

2012

Heat Mass Transfer

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Two novel enhanced tubes, viz. Turbo-C with three dimensional surface corrugations and EXTEK with helical flutes, are evaluated in the present work. They are chosen for study because of their versatility for use in condensation as well as evaporation in a double tube heat exchanger assembly, typically as used in water source heat pumps. Average and local values of heat transfer coefficient and two-phase pressure drop are reported.

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In-tube evaporation of HCFC-22 in a 9.52 mm micro-fin/smooth tube

Cited by 55 publications

References 10 publications

Two-phase flow heat transfer of propane vaporization in horizontal minichannels

Two-phase flow heat transfer of propane vaporization in horizontal minichannels

An experimental study on convective boiling of R-22 and R-410A in Horizontal smooth and micro-fin tubes

Double tube heat exchanger with novel enhancement: part 3—convective condensation

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