Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Son, Chang-Hyo; Oh, Hoo-Kyu

doi:10.1007/s00231-012-0990-1

Cited by 25 publications

(8 citation statements)

References 55 publications

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“…The subscript "x" represents the subscripts "lo" or "vo". Son and Oh [94] experimentally investigated the condensation flows of R22, R134a, and R410A refrigerants in a small-scale channel. They used a tube with a hydraulic diameter where the subscript "x" represents the subscript "v" or "l".…”

Section: Pressure Drop Correlationsmentioning

confidence: 99%

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

Başaran,

Benim

2024

Applied Sciences

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Nowadays, the demand for obtaining high heat flux values in small volumes has increased with the development of technology. Condensing flow inside mini- and microchannels has been becoming a promising solution for refrigeration, HVAC, air-conditioning, heat pumps, heat pipes, and electronic cooling applications. In these applications, employing mini/microchannels in the condenser design results in the working fluid, generally refrigerant, undergoing a phase change inside the mini/microchannels. On the other hand, the reduction in the hydraulic diameter during condensation gives rise to different flow regimes and heat transfer mechanisms in the mini- and microchannels compared to the conventional channels. Therefore, the understanding of fluid flow and heat transfer characteristics during condensation of refrigerant inside mini- and microchannels has been gaining importance in terms of condenser design. This study presents a state-of-the-art review of condensation studies on refrigerants inside mini- and microchannels. The review includes experimental studies as well as correlation models, which are developed to predict condensation heat transfer coefficients and pressure drop. The refrigerant type, thermodynamical performance, and compatibility, as well as the environmental effects of refrigerant, play a decisive role in the design of refrigeration systems. Therefore, the environmental impacts of refrigerants and current regulations against them are also discussed in the present review.

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Section: Pressure Drop Correlationsmentioning

confidence: 99%

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

Başaran,

Benim

2024

Applied Sciences

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“…The condensation flow characteristics of various refrigerants (R22, R134a and R410A) flowing in a micro-tube with 1,220 mm length and 1.77 mm inner diameter were studied experimentally [32]. Tests applied to 40 °C saturation temperature and 450 to 1,050 kg/m 2 s heat fluxes.…”

Section: Horizontal and Vertical Orientationsmentioning

confidence: 99%

“…and different channel geometries (smooth, corrugated, twisted-tape inserts, etc.) were experimentally studied [32][33][34][35][36].…”

Section: Horizontal and Vertical Orientationsmentioning

confidence: 99%

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Karademir¹,

Ozcelik²,

Açıkgöz³

et al. 2021

Journal of Thermal Engineering

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This paper presents a comprehensive review of research works on condensation and boiling heat transfer characteristics in horizontal, vertical and inclined tubes both smooth and enhanced. Although there are many studies examining two-phase flows inside tubes, it is almost impossible to find such a comprehensive study for two-phase flow in tubes. Moreover, while number of the studies concerning condensation or boiling inside tubes are limited, the present study covers almost all studies of condensation and boiling inside inclined tubes. Previous studies are classified into many subtitles according to configuration (horizontal, vertical or inclined) and roughness (smooth or enhanced) as well as aim of the study (researching the effect of parameters on the heat transfer coefficient, pressure drop or evaluation of prediction correlation). Such a wide range of classification and scope have no done before. Condensation and boiling phenomena are of great importance in heat exchangers, cooling systems, etc. due to their wide utilization in those devices. Additionally, two-phase flow and the associated heat transfer are becoming increasingly important in industrial applications because the heat transfer coefficient in twophase flows is much higher than in single-phase flows. In this research, major topics such as heat transfer, pressure drop, friction factor and void fraction were studied using active and passive techniques in the literature. The fluids used in the reviewed studies diverse in a very wide range. For pure refrigerants (single component-fluorocarbon refrigerant),

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“…Son and Oh [20] presented experimental results of pure R22, R134a and R410A refrigerants pressure drops during condensation in a vertical circular channel with an inner diameter of 1.77 mm and a length of 1.22 m for the ranges of mass flux density G = 450 -1050 kg/(m 2 s), and saturation temperature T s = 40°C. The experimental results illustrated the dependence of the vapour quality x, on the pressure drop for R22, R134a and R410A refrigerants in pipe minichannels with an internal diameter of 1.77 mm.…”

Section: Introductionmentioning

confidence: 99%

Condensation of Novec 649 refrigerant in pipe minichannels

2018

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The paper presents the results of experimental investigation of Novec 649 refrigerant condensation in tube minichannels. This is a low-pressure refrigerant. This investigations are basis for flow structures visualization during condensation in pipe minichannels. The local and the average values of pressure drop (Δp/L) and heat transfer coefficient α in the whole range of the changes of vapour quality (x = 1 ÷ 0) were calculated. On the basis of the obtained test results there was illustrated the influence of the vapour quality x, the mass flux density G and the inner diameter of channel d changes on the studied parameters. These results were compared with the calculation results based on the dependencies of other authors.

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Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Cited by 25 publications

References 55 publications

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Condensation of Novec 649 refrigerant in pipe minichannels

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