Thermal-hydraulic analysis of sinusoidal fin-based printed circuit heat exchangers for supercritical CO2 Brayton cycle

Saeed, Muhammad; Kim, Man-Hoe

doi:10.1016/j.enconman.2019.04.058

Cited by 97 publications

(20 citation statements)

References 35 publications

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“…Validation of the computed data suggests the maximum difference between the code and experimental results is around 5%. On the other hand, comparison Kim et al [34] Nu = 0.0292Re 0.8742 , f = 0.2515Re −0.2031 ; θ = 32 0 ) Nu = 0.0188Re 0.8742 , f = 0.2881Re −0.1322 ; θ = 40 0 ) (2, 000 ≤ Re ≤ 58, 000) (0.7 ≤ Pr ≤ 1.0)…”

Section: Correlations Channel Geometrymentioning

confidence: 89%

“…Energies 2021, 14, x FOR PEER REVIEW 7 of 28 Kim et al [34] = 0.0292 0.8742 , = 0.2515 −0.2031 ; (θ = 32 0 ) = 0.0188 0.8742 , = 0.2881 −0.1322 ; (θ = 40 0 ) (2,000 ≤ ≤ 58,000) (0.7 ≤ ≤ 1.0)…”

Section: Correlations Channel Geometrymentioning

confidence: 99%

“…Numerical results employed for the validation were taken from the CFD model [3] that was authenticated using experimental data [33]. The validation purpose's boundary conditions are listed in Table 2, while a comparison of the PCHE-DAC data with the experimental data Kim et al [34] = 0.0292 0.8742 , = 0.2515 −0.2031 ; (θ = 32 0 ) = 0.0188 0.8742 , = 0.2881 −0.1322 ; (θ = 40 0 ) (2,000 ≤ ≤ 58,000) (0.7 ≤ ≤ 1.0)…”

Section: Correlations Channel Geometrymentioning

confidence: 99%

“…Pressure losses across all heat exchangers are modeled using the following relation, and cycle efficiency is given by Equation (34).…”

Section: Turbomachinery Modelsmentioning

confidence: 99%

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Performance of Supercritical CO2 Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels

2020

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Since printed circuit heat exchangers (PCHE) are the largest modules of a supercritical carbon dioxide Brayton cycle, they can considerably affect the whole system’s performance and layout. Straight-channel and zigzag-channel printed circuit heat exchangers have frequently been analyzed in the standalone mode and repeatedly proposed for sCO2−BC. However, the impact of heat exchanger designs with straight and zigzag-channel configurations on the performance of the cycle and its components, i.e., the turbine and compressor, has not been studied. In this context, this study evaluates the effect of different heat exchanger designs with various values of effectiveness (ϵ), inlet Reynolds number (Re), and channel configuration (zigzag and straight channel) on the overall performance of the sCO2−BC and its components. For the design and analysis of PCHEs, an in-house PCHE design and analysis code (PCHE-DAC) was developed in the MATLAB environment. The sCO2−BC performance was evaluated utilizing an in-house cycle simulation and analysis code (CSAC) that employs the heat exchanger design code as a subroutine. The results suggest that pressure drop in PCHEs with straight-channel configuration is up to 3.0 times larger than in PCHEs with zigzag-channel configuration. It was found that a higher pressure drop in the PCHEs with straight channels can be attributed to substantially longer channel lengths required for these designs (up to 4.1 times than zigzag-channels) based on the poor heat transfer characteristics associated with these channel geometries. Thus, cycle layouts using PCHEs with a straight-channel configuration impart a much higher load (up to 1.13 times) on the recompression compressor, this in turn, results in a lower pressure ratio across the turbine. Therefore, the overall performance of the sCO2−BC using PCHEs with straight-channel configurations is found to be substantially inferior to that of layouts using PCHEs with zigzag-channel configurations. Finally, optimization results suggest that heat exchanger’s design with inlet Reynolds number and heat exchanger effectiveness ranging from 32 k to 42 k and 0.94>ϵ>0.87, respectively, are optimal for sCO2−BC and present a good bargain between cycle efficiency and its layout size.

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Section: Correlations Channel Geometrymentioning

confidence: 89%

Section: Correlations Channel Geometrymentioning

confidence: 99%

Section: Correlations Channel Geometrymentioning

confidence: 99%

“…Pressure losses across all heat exchangers are modeled using the following relation, and cycle efficiency is given by Equation (34).…”

Section: Turbomachinery Modelsmentioning

confidence: 99%

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Performance of Supercritical CO2 Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels

2020

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“…Response surface methodology (RSM) is a tool used for optimization, regression analysis, and understanding the impact of design parameters on the objective function. It is well known and has been frequently adopted in the literature [12] based on its accuracy, trivial computational costs, and ease in implementation [13].…”

Section: Pump Impeller Optimizationmentioning

confidence: 99%

Design and Optimization of a Centrifugal Pump for Slurry Transport Using the Response Surface Method

et al. 2021

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Since centrifugal pumps consume a mammoth amount of energy in various industrial applications, their design and optimization are highly relevant to saving maximum energy and increasing the system’s efficiency. In the current investigation, a centrifugal pump has been designed and optimized. The study has been carried out for the specific application of transportation of slurry at a flow rate of m3/hr to a head of 20 m. For the optimization process, a multi-objective genetic algorithm (MOGA) and response surface methodology (RSM) have been employed. The process is based on the mean line design of the pump. It utilizes six geometric parameters as design variables, i.e., number of vanes, inlet beta shroud, exit beta shroud, hub inlet blade draft, Rake angle, and the impeller’s rotational speed. The objective functions employed are pump power, hydraulic efficiency, volumetric efficiency, and pump efficiency. In this reference, five different software packages, i.e., ANSYS Vista, ANSYS DesignModeler, response surface optimization software, and ANSYS CFX, were coupled to achieve the optimized design of the pump geometry. Characteristic maps were generated using simulations conducted for 45 points. Additionally, erosion rate was predicted using 3-D numerical simulations under various conditions. Finally, the transient behavior of the pump, being the highlight of the study, was evaluated. Results suggest that the maximum fluctuation in the local pressure and stresses on the cases correspond to a phase angle of 0°–30° of the casing that in turn corresponds to the maximum erosion rates in the region.

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Numerical Analysis: Cross-Section Optimization of Printed Circuit Heat Exchanger Using Supercritical CO2 for Low Temperature Regenerator of Brayton Cycle

Krishnan¹,

Prasanna²,

Robin³

et al. 2023

Lecture Notes in Mechanical Engineering

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Thermal-hydraulic analysis of sinusoidal fin-based printed circuit heat exchangers for supercritical CO2 Brayton cycle

Cited by 97 publications

References 35 publications

Performance of Supercritical CO2 Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels

Performance of Supercritical CO2 Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels

Design and Optimization of a Centrifugal Pump for Slurry Transport Using the Response Surface Method

Numerical Analysis: Cross-Section Optimization of Printed Circuit Heat Exchanger Using Supercritical CO2 for Low Temperature Regenerator of Brayton Cycle

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