Numerical model of two-phase refrigerant flow distribution in a plate evaporator with distributors

Hu, Haitao; Zhang, Ruxu; Zhuang, Daming; Ding, Guifu; Wei, Wenjian; Xiang, Lei

doi:10.1016/j.applthermaleng.2014.09.064

Cited by 19 publications

(3 citation statements)

References 38 publications

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“…This method is not valid. Wang et al [10], Albanque et al [33] implemented their algorithms and Hu et al [65] introduced…”

Section: Mass Flow Rate Distribution Calculation Using Genetic Algorithmmentioning

confidence: 99%

Numerical simulation of multi-pass parallel flow condensers with liquid-vapor separation

et al. 2019

International Journal of Heat and Mass Transfer

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Liquid-vapor separation is an advanced technology recently developed enabling significant further heat transfer enhancement for condensers. This paper reports a distributed parameter model, using the ε-NTU method, to numerically simulate heat transfer performance of multi-pass parallel flow condensers with liquid-vapor separation (referred to as MPFCs-LS). For achieving higher accurate results and lower computational time, a segment self-subdivision method is used to locate the positions of onset and completion of condensation. Furthermore genetic algorithm is adopted to determine the refrigerant flow rates through tubes in a flow pass. Relevant empirical correlations are selected for heat transfer and frictional pressure drop in different flow regimes during condensation in microfin tubes. The predictions of the model agree well with the experimental data within ±20%. The model and numerical methods developed in this work for MPFCs-LS are of important value in design and performance optimization of these new advanced condensers.

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“…This method is not valid. Wang et al [10], Albanque et al [33] implemented their algorithms and Hu et al [65] introduced…”

Section: Mass Flow Rate Distribution Calculation Using Genetic Algorithmmentioning

confidence: 99%

Numerical simulation of multi-pass parallel flow condensers with liquid-vapor separation

et al. 2019

International Journal of Heat and Mass Transfer

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“…Mahmud et al 14 designed eight plates for the heat‐transfer characteristics of the refrigerant, with mass fluxes ranging from 10 to 50 kg/(m 2 s). Hu et al 15 investigated the effects of distributor angle on the two‐phase refrigerant flow distribution and then recommended an optimal distributor angle of the T‐junction.…”

Section: Introductionmentioning

confidence: 99%

Structural design and its thermal management performance for battery modules based on refrigerant cooling method

2020

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Summary The structural design of a refrigerant plate and its flow property affect the thermal management performance of a battery. This study, aimed at improving the cooling and thermal uniformity based on the R134a cooling method, analyzed the flow resistance of the plate, temperature, and heat‐transfer coefficient of the top board of eight types (type A‐G) by the computational fluid dynamics method. By trade‐off between flow resistance and heat‐transfer efficiency, we determined the optimal type G plate with a modest pressure difference of 1670.6 Pa and the highest heat‐transfer coefficient of 810.8 W/(m2 K). In addition, the relationship between the operating parameters and temperature variation in battery modules and its uniformity has also been analyzed. The results indicate that with this novel cooling method, temperature uniformity of battery modules can be maintained within 5 K at 2C discharging rate. Both increasing inlet R134a flow rate and decreasing evaporative pressure obviously increase the temperature decrease rate of battery modules. With the inlet R134a mass flux ranging from 245 to 490 kg/(m2 s), the evaporative pressure ranging from 412 530 to 291 220 Pa, and the subcooling degree ranging from 0 to 4 K, the battery temperature can be maintained under 300 K. In conclusion, this study develops the guidelines for battery thermal management based on refrigerant cooling, which has a promising application foreground due to its good thermal control performance, flow resistance saving, and lightweight.

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“…PHEs have recently been identified to be suitable for applications with phase change, such as evaporators, condensers and absorbers (Abu-Khader, 2012;Jung et al, 2014;Hu et al, 2015;Longo et al, 2015;Wang and Infante Ferreira, 2017). Experimental results show promising performance, but the fluid dynamics, heat and mass transfer of two-phase flow are not fully understood, which have been indicated for decades and remain addressed (Dović et al, 2009;Tsai et al, 2009;Nilpueng and Wongwises, 2010;Freund and Kabelac, 2010;Abu-Khader, 2012;Mancin et al, 2012a;Hayes et al, 2012;Le Lostec et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Two-phase vertical downward flow in plate heat exchangers: Flow patterns and condensation mechanisms

Tao

Nuijten

Ferreira

2018

International Journal of Refrigeration

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This study presents a literature review of work related to the two-phase flow patterns of vertical downward flow in plate heat exchangers with corrugated chevron plates. An understanding of these flow patterns is crucial for developing accurate models of plate heat exchangers functioning as condensers or absorbers. Flow pattern maps of the previous studies are combined and translated to dimensionless forms. One of the proposed flow pattern maps is based on L Re versus 0.5 , / TP hor Fr Λ and performs better than other representations. This map is compared with the map of tubes and shows general agreements in terms of the pattern positions, but the separating lines between flow patterns fit poorly. Influencing factors of condensation mechanisms are presented, among which mass flux and vapor quality are dominant. The preferred flow pattern map explains the transition of condensation mechanisms qualitatively when variations of mass flux and vapor quality are considered. Recommendations are given to come to more uniform flow pattern maps in plate heat exchangers with chevron corrugations.

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Numerical model of two-phase refrigerant flow distribution in a plate evaporator with distributors

Cited by 19 publications

References 38 publications

Numerical simulation of multi-pass parallel flow condensers with liquid-vapor separation

Numerical simulation of multi-pass parallel flow condensers with liquid-vapor separation

Structural design and its thermal management performance for battery modules based on refrigerant cooling method

Two-phase vertical downward flow in plate heat exchangers: Flow patterns and condensation mechanisms

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