Experimental study of a straight channel printed circuit heat exchanger on supercritical CO2 near the critical point with water cooling

Park, Joo Hyun; Kwon, Jin Gyu; Kim, Tae Ho; Kim, Moo Hwan; Cha, Jae-Eun; Jo, HangJin

doi:10.1016/j.ijheatmasstransfer.2020.119364

Cited by 67 publications

(9 citation statements)

References 30 publications

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“…where Q is the heat transfer rate in kW. In the thermal equilibrium state, Q can be obtained by Equation (2) according to previous research [7,17].…”

Section: Test Pche Prototypementioning

confidence: 99%

“…The heat transfer and pressure drop of the two media were studied separately under the fixed conditions of one side. Park et al [7] tested a straight PCHE precooler under the trans-critical, near-critical, and far-critical conditions and proposed a discretization method to design a precooler at the near-critical point. Arslan et al [8] applied the sub-heat exchanger model to design a PCHE recuperator and performed the experiments using sCO 2 and water, which indicated high accuracy between the numerical model and the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study on Thermal Hydraulic Performance of Trapezoidal Printed Circuit Heat Exchanger for Supercritical CO2 Brayton Cycle

Wang

et al. 2022

Energies

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The supercritical carbon dioxide (sCO2) Brayton cycle is the preferred power cycle for future nuclear energy, fossil energy, solar energy, and other energy systems. As the preferred regenerator in the cycle, the printed circuit heat exchanger (PCHE) exhibits a high heat transfer efficiency, compactness, and robustness. The structure design of its internal flow channel is one of the most important factors to enhance the heat transfer and reduce pressure loss. In the present work, a trapezoidal PCHE prototype is designed and manufactured, and its thermal-hydraulic performance as a regenerator is experimentally studied in the sCO2 test loop. The overall heat transfer coefficient exceeds 1.10 kW/(m2·K) and reaches a maximum of 2.53 kW/(m2·K) with the changes in the inlet temperature, the working pressure, and the mass flow rate. Correlations of the Nusselt numbers are proposed on both sides, with the Reynolds numbers ranging from 10,000 to 30,000 and 4800 to 14,000, and the Prandtl numbers ranging from 0.91 to 1.61 and 0.77 to 0.98 on the cold side and hot side, respectively. The pressure drop of the channels calculated by the peeling method using a single-plate straight prototype is less than 7 kPa and 15 kPa on the hot and the cold side, respectively. The heat recovery efficiency is analyzed to evaluate the performance as a regenerator. Finally, simulation works are carried out to verify the experimental results and expand the Reynolds numbers ranging from 3796 to 30,000 and 1821 to 14,000, on the cold side and hot side, respectively. This work provides the test methods and experimental correlations for the development of an efficient PCHE in the sCO2 Brayton cycle.

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“…where Q is the heat transfer rate in kW. In the thermal equilibrium state, Q can be obtained by Equation (2) according to previous research [7,17].…”

Section: Test Pche Prototypementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Thermal Hydraulic Performance of Trapezoidal Printed Circuit Heat Exchanger for Supercritical CO2 Brayton Cycle

Wang

et al. 2022

Energies

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“…The experimental results show that PCHE has better comprehensive performance under higher pressure conditions. Park et al [61] examined the characteristics of carbon dioxide in PCHE with straight channels based on three working conditions: trans-critical state (ante-critical state cooled from supercritical state to sub-cooled liquid), near-critical state (cooled from supercritical state of gas sample to supercritical state of liquid sample) and the far-critical state (cooled only in supercritical state of gas).…”

Section: Pche With Straight Channelsmentioning

confidence: 99%

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Liao

Zhang

et al. 2021

Energies

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Heat exchangers play an important role in power, the chemical industry, petroleum, food and many other industrial productions, while compact heat exchangers are more favored in industrial applications due to their high thermal efficiency and small size. This paper summarizes the research status of different types of compact heat exchangers, especially the research results of heat transfer and pressure drop of printed circuit heat exchangers, so that researchers can have an overall understanding of the development of compact heat exchangers and get the required information quickly. In addition, this paper summarizes and analyzes several main working fluids selected in compact heat exchangers, and puts forward some discussions and suggestions on the selection of working fluids. Finally, according to the existing published literature, the performance evaluation indexes of compact heat exchangers are summarized and compared, which is convenient for developers and researchers to better grasp the design direction.

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“…Based on the entropy and exergy evaluation, Yilmaz et al 26 investigated the efficiency of heat transfer performance. Several studies investigate the utilization of different working fluids, 27,28 such as supercritical carbon dioxide (SCO 2 ) and helium, to enhance heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer performance comparison of printed circuit heat exchangers with straight, zigzag and serpentine flow channels for waste heat recovery

Xie

Chueh

Chen

et al. 2021

Intl J of Energy Research

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Summary In the present study, a printed circuit heat exchanger (PCHE) is investigated numerically by solving the steady‐state Navier–Stokes equations and energy equation. The PCHE is equipped with straight, wavy, and serpentine flow channels, allowing us to investigate the PCHE performance on a systematic basis of effectiveness and pressure drop between the inlet and outlet of the flow channels. Liquid water is utilized as a working fluid at temperatures of 30°C to 90°C, with geothermal heating rarely targeted for using water from hot springs. The numerical results are validated with experimental data, confirming that the shear stress transport (SST) turbulence model is suited for providing adequate accuracy. This study is intended to delve into several possible designs of PCHE's flow channels to reduce the pressure drop while increasing the effectiveness. Given the PCHE with 13 zigzag flow channels of the bending angle of 150°, the results show that the PCHE with the zigzag flow channels at a mass flow rate of 0.113 kg/s possesses significant heat transfer enhancement. When compared to the other two tested PCHEs (straight flow and serpentine flow passages), a 65% increase in effectiveness and a 39% rise in pressure drop are exhibited. The PCHE can be regarded as a recuperator of the Organic Rankine Cycle (ORC) and is generally thought to be an important part of maximizing the efficiency of the cycle. The favorable features of the zigzag PCHE make it possible to seamlessly integrate the zigzag PCHE into ORC as part of a waste heat recovery system in a feasible way to improve the ORC efficiency.

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Experimental study of a straight channel printed circuit heat exchanger on supercritical CO2 near the critical point with water cooling

Cited by 67 publications

References 30 publications

Experimental and Numerical Study on Thermal Hydraulic Performance of Trapezoidal Printed Circuit Heat Exchanger for Supercritical CO2 Brayton Cycle

Experimental and Numerical Study on Thermal Hydraulic Performance of Trapezoidal Printed Circuit Heat Exchanger for Supercritical CO2 Brayton Cycle

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Heat transfer performance comparison of printed circuit heat exchangers with straight, zigzag and serpentine flow channels for waste heat recovery

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