Experimental study of printed-circuit heat exchangers with airfoil and straight channels for optimized recuperators in nitrogen Brayton cycle

Chung, Sungkun; Lee, Su-Won; Kim, Nam-Hyeong; Shin, Seong Min; Kim, Moo Hwan; Jo, HangJin

doi:10.1016/j.applthermaleng.2022.119348

Cited by 17 publications

(2 citation statements)

References 51 publications

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“…All the governing equations are solved for each discretized volume at each time step, n, until the end of the specified solution time span, as per Figure 3. The numerical method uses a semi-implicit solution scheme for each time step; see Equations ( 9) and (10) for the explicit and semi-implicit time steps.…”

Section: Solution Structurementioning

confidence: 99%

“…PCHEs have many desirable qualities, such as (1) a high operating temperature of up to 980 • C; (2) high pressure capabilities of up to 965 bar; (3) a high surface area density at high pressures (1300 m 2 /m 3 at 100 bar); (4) a minimum approach temperature as low as 1 • C; and (5) a high heat exchanger effectiveness of up to 99% [8,9]. Due to these desirable qualities, PCHEs have been designed for applications such as N 2 -and supercritical CO 2 -based Brayton cycles, steam generation for small modular reactors, and waste heat recovery from exhaust gas [10][11][12][13]. However, the PCHE design as a process-intensified reactor unit can be further explored.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Design of a Novel Integrated Heat Exchange Reactor for Oxy-Fuel Combustion Flue Gas Deoxygenation

Ge,

Furlong,

Champagne

et al. 2024

Energies

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The concentration of residual O2 in oxy-fuel combustion flue gas needs to be reduced before CO2 transportation, utilization, or storage. An original application of the printed circuit heat exchanger (PCHE) for catalytic combustion with natural gas (catalytic deoxygenation) is described for reducing the residual O2 concentration. The PCHE design features multiple adiabatic packed beds with interstage cooling and fuel injection, allowing precise control over the reaction extent and temperature within each reaction stage through the manipulation of fuel and utility flow rates. This work describes the design of a PCHE for methane–oxygen catalytic combustion where the catalyst loading is minimized while reducing the O2 concentration from 3 vol% to 100 ppmv, considering a maximum adiabatic temperature rise of 50 °C per stage. Each PCHE design differs by the number of reaction stages and its individual bed lengths. As part of the design process, a one-dimensional transient reduced-order reactor model (1D ROM) was developed and compared to temperature and species concentration axial profiles from 3D CFD simulations. The final design consists of five reaction stages and four heat exchanger sections, providing a PCHE length of 1.09 m at a processing rate of 12.3 kg/s flue gas per m3 PCHE.

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Section: Solution Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling and Design of a Novel Integrated Heat Exchange Reactor for Oxy-Fuel Combustion Flue Gas Deoxygenation

Ge,

Furlong,

Champagne

et al. 2024

Energies

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On the Design of Recuperator for Transcritical Cycle Adopting CO₂‐Based Mixture as Working Fluid: A Focus on Transport Properties Prediction

Doninelli,

Di Marcoberardino

2023

Energy Tech

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Transcritical cycles working with CO2‐based mixtures gain considerable attention due to thermodynamic efficiency gain compared to pure sCO2 in hot environments. Previous literature works prove that the adoption of CO2 mixtures provides a reduction of the levelized cost of electricity in concentrated solar power applications and medium–high temperature heat recovery. However, for techno‐economic analysis and heat exchanger design, proper evaluation of transport properties of the CO2‐based mixtures in power cycle conditions is necessary. Herein, it deals with the analysis of the proper transport properties models for CO2 mixtures to assess their actual thermal behavior. A literature review on transport properties models, and their validation with available experimental data, proves that the friction theory is suitable for CO2 blended with dopants having high molecular complexity. The impact of the different model selection on the recuperator sizing, considering optimized power cycle conditions, is assessed on the CO2 mixtures with hexafluorobenzene and decane: The TRAPP and Chung–Lee–Starling models are imported from Aspen Plus, while the friction theory model is implemented and calibrated in an in‐house MATLAB code. The optimal design of the recuperator for the CO2 + C6F6 mixture in a 100 MWel power block coupled with a solar power plant located in Sevilla is carried out.

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Heat Transfer and Friction Characteristics of Printed Circuit Heat Exchangers with Different Channel Structures for S-CO2 Power System

Jiang,

2024

J. Therm. Sci.

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Experimental study of printed-circuit heat exchangers with airfoil and straight channels for optimized recuperators in nitrogen Brayton cycle

Cited by 17 publications

References 51 publications

Modelling and Design of a Novel Integrated Heat Exchange Reactor for Oxy-Fuel Combustion Flue Gas Deoxygenation

Modelling and Design of a Novel Integrated Heat Exchange Reactor for Oxy-Fuel Combustion Flue Gas Deoxygenation

On the Design of Recuperator for Transcritical Cycle Adopting CO₂‐Based Mixture as Working Fluid: A Focus on Transport Properties Prediction

Heat Transfer and Friction Characteristics of Printed Circuit Heat Exchangers with Different Channel Structures for S-CO2 Power System

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Experimental study of printed-circuit heat exchangers with airfoil and straight channels for optimized recuperators in nitrogen Brayton cycle

Cited by 17 publications

References 51 publications

Modelling and Design of a Novel Integrated Heat Exchange Reactor for Oxy-Fuel Combustion Flue Gas Deoxygenation

Modelling and Design of a Novel Integrated Heat Exchange Reactor for Oxy-Fuel Combustion Flue Gas Deoxygenation

On the Design of Recuperator for Transcritical Cycle Adopting CO2‐Based Mixture as Working Fluid: A Focus on Transport Properties Prediction

Heat Transfer and Friction Characteristics of Printed Circuit Heat Exchangers with Different Channel Structures for S-CO2 Power System

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On the Design of Recuperator for Transcritical Cycle Adopting CO₂‐Based Mixture as Working Fluid: A Focus on Transport Properties Prediction