An experimental study and development of new correlation for condensation heat transfer coefficient of refrigerant inside a multiport minichannel with and without fins

Rahman, M.M.; Kariya, Keishi; Miyara, Akio

doi:10.1016/j.ijheatmasstransfer.2017.09.010

Cited by 47 publications

(23 citation statements)

References 27 publications

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“…In the same way, the portion of vapor in two-phase flow during the condensation heat transfer tends to decrease, which impedes turbulent flow. According to Rahman et al [35], the density ratio (ρ l /ρ v ) becomes smaller as the saturation pressure increases, and the specific volume of vapor decreases as the saturation pressure increases. This means the portion of liquid increases, thereby the liquid layer gets thicker in the certain volume of heat transfer channel.…”

Section: Effect Of Saturation Pressurementioning

confidence: 99%

Effects of Experimental Parameters on Condensation Heat Transfer in Plate Fin Heat Exchanger

et al. 2021

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This study aims to provide an experimental investigation and comparison of the condensation heat transfer characteristics in a plate–fin heat exchanger (PFHE). The heat flux, mass flux, and saturation pressure were adjusted as experimental parameters to verify the effects on the condensation heat transfer. In addition, condensation heat transfer correlation of two-stream PFHEs was provided based on the experimental data for utilization as a design reference for the heat exchanger. The turbulence is the most influential in heat transfer. One of the ways to foster turbulence is to increase shear stress. The higher flow velocity results in the higher shear stress. That was why increasing mass flux or the flow with higher vapor quality showed the higher heat transfer coefficient (HTC). Refrigerant properties such as viscosity and specific volume of vapor changed according to the saturation pressure. It is expected they affect the degree of turbulence too in similar manners. The mass flux was more influential than the heat flux and saturation pressure. Thus, the equivalent mass flux of the refrigerant is dominant in the derived correlation model. The average difference between experimental and calculated HTC from correlations was about 6.5%. Multi-stream PFHE comprises an additional heat transfer surface, which implies a more active droplet formation. The average pressure drop in the multi-stream is 15% larger than that of the two-stream.

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Section: Effect Of Saturation Pressurementioning

confidence: 99%

Effects of Experimental Parameters on Condensation Heat Transfer in Plate Fin Heat Exchanger

et al. 2021

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“…These have been reviewed by Awad et al [27] and Del Col et al [28]. Recent correlations for mini channels include those by Jige et al [29], Rahman et al [30], and Keinath and Garimella [31]. Among the numerous correlations specifically for minichannels, only that of Kim and Mudawar [1] has been validated with wide ranging data from many sources.…”

Section: Correlationsmentioning

confidence: 99%

Prediction of Heat Transfer during Condensation in Non-Circular Channels

Shah

2019

Inventions

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It is desirable to know whether correlations for condensation in round tubes can be used for non-circular channels. To investigate this matter, a number of well-known correlations for mini and macro channels as well as some for flattened channels were compared to a database for condensation in non-circular channels. Data included square, rectangular, triangular, semi-circular, drum, N, and W shaped channels as well as flattened tubes. The data included 15 fluids, hydraulic diameter 0.067 to 1.46 mm, aspect ratio 0.14 to 7, reduced pressure 0.045 to 0.77, and mass flux from 48 to 1000 kgm −2 s −1 . None of the correlations worked well for flattened tubes. Data for all other shapes were best predicted by the Shah correlation with mean absolute deviation of 20.1% with 1120 data points from 22 sources. None of the other correlations was found satisfactory over the entire range.

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“…As these articles contain correlations verified by calculations of pressure drop and heat transfer during condensation, it will be important to analyze correlations useful for calculations performed for minichannels. For this purpose, the correlation of Rahman-Kariya-Miyara [10] can be used to calculate the heat transfer coefficient. It was based on experimental investigation results of R134a refrigerant condensation in a horizontal and rectangular multiport consisting of 20 channels with hydraulic diameters from 0.64 to 0.81 mm for the mass flux density range of G = 50-200 kg/m 2 s. A strong dependence of the heat transfer coefficient on mass flux density, saturation temperature, vapor quality and channel geometry was observed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of HFE 7000 Refrigerant Condensation in Horizontal Pipe Minichannels

2021

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This article presents the results obtained from our own experimental investigations on heat exchange and pressure drop during the condensation flow of the HFE 7000 refrigerant in pipe minichannels with an internal diameter of di = 1.2–2.5 mm. The influence of vapor quality x and the mass flux density G on the two-phase flow pressure drops and heat transfer is presented. The tests were performed for the mass flux density range of G = 110–4700 kg/m2s, saturation inlet temperature of Ts = 36–43 °C and heat flux density of q = 1 ÷ 20 kW/m2. The pressure drop characteristics and heat transfer coefficient as a function of the internal diameter of minichannels are illustrated. The results of experimental research on the heat transfer coefficient and two-phase pressure drop are compared with correlations developed by other authors. The best accuracy has a comparison of experimental study with correlation of Rahman-Kariya-Miyara et al. and Mikielewicz et al.

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An experimental study and development of new correlation for condensation heat transfer coefficient of refrigerant inside a multiport minichannel with and without fins

Cited by 47 publications

References 27 publications

Effects of Experimental Parameters on Condensation Heat Transfer in Plate Fin Heat Exchanger

Effects of Experimental Parameters on Condensation Heat Transfer in Plate Fin Heat Exchanger

Prediction of Heat Transfer during Condensation in Non-Circular Channels

Experimental Study of HFE 7000 Refrigerant Condensation in Horizontal Pipe Minichannels

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