Enhanced of fluids mixing and heat transfer in a novel SSK static mixer Organic Rankine Cycle direct contact heat exchanger

Geng, Jian; Zheng, Guanfeng; Wang, Hua; Huang, Junwei

doi:10.1016/j.applthermaleng.2022.119580

Cited by 15 publications

(4 citation statements)

References 18 publications

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“…When the working condition was 363.15 K, the VHTC of the three heat exchangers were higher than those of the other two working conditions. This indicated that the smaller initial temperature difference could improve the VHTC of the heat exchanger [47].…”

Section: Reviewmentioning

confidence: 89%

“…Baqir et al [42] studied the influence of several parameters on temperature distribution, such as flow rate, nozzle configuration, and continuous initial temperature distribution, and found that an increase in heat exchanger height leads to an increment in the temperature of the dispersed phase and a decrease in the temperature of the continuous phase, regardless of the direction of fluid flow. By placing a direct contact heat exchanger into a vapor compression heat pump system, Shen [43] took advantage of the low temperature difference heat transfer and high heat transfer rate in the direct contact heat transfer process to reduce the pressure and temperature difference between the condenser and evaporator and improve the performance of the heat pump. Xu et al [44] used the controlled variable method to comprehensively study a variety of thermodynamic indicators for direct contact evaporators with different flow rates at constant temperatures.…”

Section: Reviewmentioning

confidence: 99%

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Research Progress on Direct Contact Evaporation Heat Transfer between Two Immiscible Working Fluids

Fu,

Xiong,

Liu

et al. 2023

Chem Eng & Technol

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The direct contact evaporation heat transfer of two immiscible fluids can realize low‐temperature differential heat transfer, which is an important method to improve the heat transfer coefficient. This article focuses on the dispersed phase of organic working fluids and the continuous phase of immiscible inorganic fluids and summarizes the research on direct contact evaporation heat transfer in the past 15 years. The main research methods include theoretical analysis, numerical models, and experimental research. The evaporation process of a single droplet mainly involves bubble droplet growth, droplet configuration and discriminant, droplet shape change, rising speed and path, etc. In practice, dispersed phases mostly exist in populations, and the research mainly focuses on collisions, coalescence, and rupture between droplets and bubbles, as well as on the number and size distribution. The volumetric heat transfer coefficient is used to reflect the heat transfer capacity of the heat exchanger. The factors affecting evaporation heat transfer performance are complex, and increasing the uniform mixing of bubbles is an important method to improve the heat transfer coefficient. In the future, direct contact evaporation heat transfer is expected to be promoted to multiple fields.

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Section: Reviewmentioning

confidence: 89%

Section: Reviewmentioning

confidence: 99%

Research Progress on Direct Contact Evaporation Heat Transfer between Two Immiscible Working Fluids

Fu,

Xiong,

Liu

et al. 2023

Chem Eng & Technol

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“…Considering the hypothesis that variations of kinetic (Ek) and potential (Ep) energies could be neglected for this thermodynamical system [32], the equation becomes:…”

Section: Theoretical Principle Of Rankine Power Stationmentioning

confidence: 99%

Forecasting Electricity Generated in A Rankine Power Station Running in Grid-connected Mode

2023

IJIES

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To ensure proactive and intelligent control of the electrical power generated in industrial units selfproducing energy, the construction of a data-driven model devoted to power prediction is an efficient solution that we have proven in this contribution. The remarkable added value of the paper was articulated around three main pillars: primarily, we have modelled a power station based on Rankine cycle that serves the energy needs of an industrial facility. Secondly, the connection of this plant to the public electric grid has been taken into consideration in modelling. Thirdly, we have used the model to avoid paying unwanted bills thanks to the forecasting of periods when there is an energy importation from grid. Before constructing the model, we have prepared a dataset composed of more than 25 million data points, reflecting the history of 3 years of archived data related to fifteen 15 features, in order to predict the target variable of this study. After finding that GRU and LSTM are among the most successful deep learning algorithms in energy prediction, we decided to use them in our particular application. Afterwards, a comparative study between them was first carried out on accuracy, where encouraging results were obtained on both sides, with respective scores of 98.73% and 99.36% during the training step, followed by 98.51% and 99.11% during the testing phase. Besides, the evaluation in terms of loss functions gave a convergence of the GRU model after 8 epochs, against 11 epochs for the LSTM algorithm. Therefore, we preferred to use LSTM in the definitive model because of its higher accuracy, providing that good computing power is used, so that the processing time could be acceptable by the endusers. Finally, we deployed the model to simulate a real case of forecasting the power drop one week in advance. In this case, we found that if the industrial unit had used the results of the model as a proactive decision support tool, it would have avoided importing 1456.4 MWh for 8 days from the national grid, which was equivalent to a loss of 119,094.8 USD.

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“…This is attributed to the generation of eddies and lateral velocity components as the distinct liquids traverse these mixing inserts. The utilization of these elements has the potential to reduce the required pressure for achieving a liquid mixture [4]. The impact of lobed mixers on improving mixing efficiency is evident, with increased penetration angles and lobed mixer heights contributing to enhanced efficacy, reaching an optimal point at a 20°penetration angle and a lobed mixer height aligned with the wavelength.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature, geometric parameters, and surface conditions on fluid mixing in a vertical port static mixer

Mathew,

Robinson Smart,

Wins

et al. 2024

Eng. Res. Express

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This study comprehensively investigates how elevated temperature and surface roughness affect vertical liquid jet mixing in a multi-port nozzle, using both experimental and computational methods. It explores various geometrical parameters and precise nozzle positioning. Experiments, conducted across different temperature and surface roughness conditions, involve adjusting convergent nozzle angles, driving nozzle distance from the throat, and insert presence. Conductivity probes, turbidity meters, and pH meters quantify fluid mixing under diverse conditions. Optimal mixing conditions for vertical flow secondary fluid inlets are determined, along with corresponding mixing efficiencies for each port. Computational fluid dynamics (CFD) simulations with ANSYS Fluent R2 2001 confirm that the highest mixing efficiency of nearly 98 % is achieved with an elevated temperature of 50°C, a rough-surfaced convergent nozzle, a helical insert, and a 45 mm driving nozzle distance, when all vertical ports are open simultaneously. These findings advance understanding of optimizing vertical-flow mixing in multi-port static mixers under varying conditions.

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Enhanced of fluids mixing and heat transfer in a novel SSK static mixer Organic Rankine Cycle direct contact heat exchanger

Cited by 15 publications

References 18 publications

Research Progress on Direct Contact Evaporation Heat Transfer between Two Immiscible Working Fluids

Research Progress on Direct Contact Evaporation Heat Transfer between Two Immiscible Working Fluids

Forecasting Electricity Generated in A Rankine Power Station Running in Grid-connected Mode

Effect of temperature, geometric parameters, and surface conditions on fluid mixing in a vertical port static mixer

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