Condensation of refrigerant R407C in multiport minichannel section

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

doi:10.1515/aoter-2016-0024

Cited by 4 publications

(11 citation statements)

References 14 publications

(17 reference statements)

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“…Numerous experimental condensation pressure drop investigations in multiport minichannel condensers were reported by researchers [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] in the past two decades. Most of those investigations were for laminar condensation [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], while a few reported turbulent condensation [4-13, 15-19, 21] friction pressure drop measurements. Cavallini et al [4] reported friction pressure drop gradients for condensation of R236ea, R134a, and R410A in a 1.4 mm diameter multiport minichannel condenser.…”

Section: Multiport Minichannel Condensersmentioning

confidence: 99%

“…Bohdal et al [11] conducted condensation pressure drop experiments in two 0.64 mm diameter multiport minichannel condensers with 4 and 8 parallel channels. The R407C condensation friction pressure gradient data in the range of G ¼ 126-1117 kg/m 2 s and at T sat ¼ 35 C were not validated against widely reported correlations.…”

Section: Multiport Minichannel Condensersmentioning

confidence: 99%

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A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

Mukkamala

Dirker

2022

Heat Transfer Engineering

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Due to flow maldistribution, the condensation and evaporation flow patterns in multiport minichannels are considerably different from single minichannels or macrochannels. This article compiled the friction pressure drop data from experimental phase-change investigations in multiport minichannel condensers and evaporators over the past two decades. The data was reduced to friction pressure gradients, and a new two-phase multiplier was proposed for estimating the phase-change pressure drop in multiport condensers and evaporators. Thirteen hundred and forty-four condensation pressure drop and six hundred and twentythree evaporation pressure drop data from twenty-nine studies were correlated to yield four predictive two-phase multiplier equations in the laminar and turbulent flow regimes. The predictive correlations fit 67% of the laminar condensation and 80% of the turbulent pressure drop data within ±50%. Further, 57% of the laminar evaporation and 100% of the turbulent evaporation pressure drop data were fit within ±50%. The correlations were compared with widely published correlations and were a significant improvement. Metaanalysis revealed that multiport minichannels are most effective for reducing turbulent flow condensation pressure drop and laminar flow evaporation pressure drop. The compiled data and presented correlations and analysis should be helpful to the process, electronics packaging, aviation, and aerospace industries designing compact, lightweight, and high-efficiency condensers, and evaporators.

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Section: Multiport Minichannel Condensersmentioning

confidence: 99%

Section: Multiport Minichannel Condensersmentioning

confidence: 99%

A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

Mukkamala

Dirker

2022

Heat Transfer Engineering

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“…where Nu f is a number describing the intensity of the heat transfer as cooling medium flows through a cylindrical horizontal channel. In line with the fact that the range of liquid Reynolds number is in the range from 3000 to 10,000, the Nusselt number was determined by Nu f and was calculated according to the modified Hausen formula [40], the use of which is appropriate in the field of transient and turbulent flow, Re f = 2300 ÷ 15,000. The equation is:…”

Section: Experimental Investigationsmentioning

confidence: 99%

“…The largest discrepancies were found for Kutateładze [44], where MAPE was 91.7%. The above discrepancies result from the fact that the correlations adopted for comparison are recommended for conventional channels [37,40] or flow inside minichannels [42]. Hence, they are of little use for calculating surface condensation in mini spaces.…”

Section: Experimental Investigationsmentioning

confidence: 99%

External Condensation of HFE 7000 and HFE 7100 Refrigerants in Shell and Tube Heat Exchangers

2021

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The paper describes the results of experimental studies of media as an intermediary in heat exchange taking place in low volume conditions. Their properties predestine them both as a future-proof for transporting and storing heat materials. The paper concerns the current topic related to the miniaturization of cooling heat exchangers. There are many studies in the literature on the phase transition of refrigerants in the flow in pipe minichannels. However, there is a lack of studies devoted to the condensation process in a small volume on the surface of pipe minichannels. The authors proposed a design of a small heat exchanger with a shell-and-tube structure, where the refrigerant condenses on the outer surface of the pipe minichannels cooled from the inside with water. It is a response to the global trend of building highly efficient, miniaturized structures for cooling and air conditioning heat exchangers. Two future-proof, ecological replacements of the CFC refrigerants still present in the installations were used for the experimental research. These are low-pressure fluids HFE 7000 and HFE 7100. The tests were carried out in a wide range of changes in thermal-flow parameters: G = 20–700 kg·m−2s−1, q = 3000–60,000 W·m−2, ts = 40–80 °C.

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“…The phenomenon of condensation in heat exchangers can occur on a flat surface (in plate condensers), on the external surface of the channels (e.g., in shell and tube condensers) or during the flow of the refrigerant inside the channels (e.g., in air-cooled condensers with external enhancement) [1,9,16]. When refining the problem to the condensation of the refrige-rant in a flow inside channels, one needs to pay attention to the shape of the cross-section [3,6,7] (in the majority of cases, pipe channels with a circular cross-section are used), the hydraulic diameter [5,8,14] and the channel length (i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of the inclination angle of the condenser on the heat transfer coefficient value – experimental study

Charun¹,

Czapp²,

Czapp³

et al. 2016

ZN PRz Mechanika

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Considering problem of the condensation of the refrigerant in a flow inside channel, the attention should be paid to the shape of its cross-section, the hydraulic diameter, the channel length as well as the orientation of the channel axis in space (horizontal, vertical, inclined). This paper presents an experimental study concerning the effect of the inclination angle of the condenser with a single coil pipe on the heat transfer coefficient value. In the laboratory test the aircooled condenser with R410A refrigerant has been investigated. The results of test have proved that during the condensation in a single inclined pipe channel there is a specific value of the inclination angle at which the highest value of the heat transfer coefficient is obtained.

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Condensation of refrigerant R407C in multiport minichannel section

Cited by 4 publications

References 14 publications

A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

External Condensation of HFE 7000 and HFE 7100 Refrigerants in Shell and Tube Heat Exchangers

Effect of the inclination angle of the condenser on the heat transfer coefficient value – experimental study

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