In-tube performance evaluation of an air-cooled condenser with liquid–vapor separator

Zhong, Tianming; Chen, Ying; Hu, Nan; Zheng, Wenxian; Luo, Xianglong; Mo, Songping

doi:10.1016/j.apenergy.2014.07.032

Cited by 26 publications

(2 citation statements)

References 15 publications

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“…Zhong et al [4] experimentally confirmed that when the mass flux is higher than 590 km/(m 2 •s), LSC has a higher heat transfer coefficient and 30.5-52.6% lower pressure drop, simultaneously. They further pinpointed that LSC has superior comprehensive performance in terms of penalty factor and minimum entropy generation number [5]. Li et al [6] discovered that the condenser inserted with a T-junction unit can improve the heat transfer capacity by approximately 5.1%.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions

Huang

Chen

et al. 2022

Applied Sciences

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Vapor-liquid separation during condensation enables the enhancement of heat transfer coefficient and reduction in pressure drop simultaneously. The vapor-liquid separator is vital to the performance of such a liquid-separation condenser (LSC). It should fulfill the functions of allowing the condensate to drain away as much as possible from the separator and leaving only vapor to continue condensing afterwards. However, due to the intensive interactions between the liquid and vapor, it is really hard to achieve perfect vapor-liquid separation, adding new uncertainties to the maldistributions in the branch outlets of a parallel condenser. To discover more insights of the flow conditions in the header and phase distributions, the characteristics of the orifice-baffle header are studied by using CFD and the mechanistic model for the droplet analysis is established by means of force balance in this paper. A parametrical analysis is carried out to discover the effects of operating conditions. It is found that the maximum vapor-liquid separation efficiency (η) is 51.94% as the inlet mass flow rate (ṁin) is 12 g/s. The vapor leakage from the orifice because of the liquid impact is one of the main reasons that deteriorate the vapor-liquid separation performance. Moreover, the vortex in the header increases the local mass flux, thereafter decreasing the droplet diameter. With the increasing of ṁin, the dominant force of the droplet in the vertical direction switches from FG to FD2.

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Section: Introductionmentioning

confidence: 99%

Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions

Huang

Chen

et al. 2022

Applied Sciences

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“…This model appears accurate, simplified and low computational cost and was used to optimise the tube-pass strategy of the condenser. Zhong et al [22][23][24][25] implemented the same model to simulate the performance of single/duo-slab parallel flow microchannel condensers (PFMCs) with liquid-vapor separation. Luo et al [26][27] applied the model for the optimization of the MPFCs-LS in organic Rankine circle.…”

Section: Introductionmentioning

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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Numerical Simulation of Thermal–Hydraulic Performance of a Round Tube-Fin Condenser with Liquid–Vapour Separation

Chen

Wang

2021

Advances in Heat Transfer and Thermal Engineering

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In-tube performance evaluation of an air-cooled condenser with liquid–vapor separator

Cited by 26 publications

References 15 publications

Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions

Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions

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

Numerical Simulation of Thermal–Hydraulic Performance of a Round Tube-Fin Condenser with Liquid–Vapour Separation

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