Empirical study of heterogeneous refrigerant condensation in pipe minichannels

Bohdal, T.; Charun, H.; Sikora, Małgorzata

doi:10.1016/j.ijrefrig.2015.07.002

Cited by 24 publications

(12 citation statements)

References 28 publications

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“…Figure 4 shows the dependence of local heat transfer values on the inner diameter d w . The results of own empirical studies were compared with the results of calculations according to the correlations of other authors [10][11][12][13][14]. The graphical comparison shows the adjustment of existing heat exchange prediction models to the results of the experiment.…”

Section: Test Resultsmentioning

confidence: 99%

An investigation of heat transfer coefficient during refrigerants condensation in vertical pipe minichannels

et al. 2018

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This article presents the results of experimental research of heat transfer coefficient in air cooled vertical pipe minichannels during R404A, R407C and R410A high-pressure refrigerants condensation. The study determined local and average heat transfer coefficient values in full range of vapour quality, x = 0 ÷ 1. On the basis of experimental investigations, the dependence of heat transfer on the vapour quality x, mass flux density G and minichannel's internal diameter dw was obtained.

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Section: Test Resultsmentioning

confidence: 99%

An investigation of heat transfer coefficient during refrigerants condensation in vertical pipe minichannels

et al. 2018

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“…A wide range of those devices operates within boiling or condensation of the working fluid to take advantage of high heat transfer coefficients [7]. Two-phase flows are associated with large rates of heat transfer because of the latent heat of evaporation and enhancement of the turbulence level between the liquid and the solid surface [8,9]. High heat fluxes can also be obtained by means of numerous enhancement technologies [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental validation of pressure drop models during flow boiling of R134a – effect of flow acceleration and entrainment

2018

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A crucial step to assure proficient work of power and process apparatus is their proper design. A wide array of those devices operates within boiling or condensation of the working fluid to benefit from high heat transfer rates. Two-phase flows are associated with high heat transfer coefficients because of the latent heat of evaporation and high turbulence level between the liquid and the solid surface. Predicting heat transfer coefficient and pressure drop is a challenging task, and has been pursued by researchers for decades. In the case of diabatic flows, the total pressure drop is due to the change in kinetic and potential energy. The article presents detailed boiling pressure drops data for R134a at a saturation temperature of 19.4°C. Study cases have been set for a mass flux varying from 300 to 500 kg/m2s. Presented data along with the data reduction procedure was used to obtain the momentum pressure drop values during flow boiling. The study focuses on experimental values of momentum pressure drop component and its prediction based on various void fraction models and entrainment effects.

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“…These trends have spurred unprecedented increases in heat dissipation per volume and per surface area, forcing the research in heat removal enhancement in air cooling [1] and single-phase liquid cooling solutions [2]. Cooling demands in these and many other applications have resulted in a paradigm shift from single-phase to two-phase cooling strategies to capitalize upon the coolant's sensible and latent heat rather than sensible heat alone.…”

Section: Introductionmentioning

confidence: 99%

Investigations on mixture preparation for two phase adiabatic pressure drop of R134a flowing in 5 mm diameter channel

Muszyński

Andrzejczyk

Dorao

2017

Archives of Thermodynamics

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The article presents detailed two-phase adiabatic pressure drops data for refrigerant R134a. Study cases have been set for a mass flux varying from 200 to 400 kg/m 2 s, at the saturation temperature of 19.4• C. Obtained experimental data was compared with the available correlations from the literature for the frictional pressure drop during adiabatic flow. Influence of mixture preparation on pressure drop was investigated, for varying inlet subcooling temperature in the heated section. The flow patterns have also been obtained by means of a high-speed camera placed in the visualization section and compared with literature observations.

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Empirical study of heterogeneous refrigerant condensation in pipe minichannels

Cited by 24 publications

References 28 publications

An investigation of heat transfer coefficient during refrigerants condensation in vertical pipe minichannels

An investigation of heat transfer coefficient during refrigerants condensation in vertical pipe minichannels

Experimental validation of pressure drop models during flow boiling of R134a – effect of flow acceleration and entrainment

Investigations on mixture preparation for two phase adiabatic pressure drop of R134a flowing in 5 mm diameter channel

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