Comparative study on the thermal-hydraulic performance of a shell and plate particle-SCO2 moving packed bed heat exchanger with various channel configurations

Yin, Jun-Ming; Zheng, Qiu‐Yun; Zhang, Xinrong

doi:10.1016/j.applthermaleng.2020.115946

Cited by 15 publications

(5 citation statements)

References 30 publications

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“…The published static model only dissected the performance of MPBE with straight SCO 2 channels; moreover, the findings revealed that convection thermal resistance on the SCO 2 side contributed a lot in total thermal resistance. To ameliorate the heat transfer behavior and extend the channel configurations, the author proposed four improved channels modified with different fins 25 . The specification parameters of fins can be referred in the author's former publication.…”

Section: Model Establishmentmentioning

confidence: 99%

“…To ameliorate the heat transfer behavior and extend the channel configurations, the author proposed four improved channels modified with different fins. 25 The specification parameters of fins can be referred in the author's former publication. The relating Nu and friction factor f correlations embedded in the static model are tabulated in Table 1, as well as their application ranges.…”

Section: Static Modelmentioning

confidence: 99%

“…Yin lately figured out the mechanism explanation to the poor heat transfer behavior on SCO 2 side under varied heat flux boundary conditions and introduced four types of fins to SCO 2 straight channel, including zigzag fins, s‐shaped fins, offset rectangular fins, and offset airfoil fins. A comparative study on the thermal‐hydraulic behavior of a shell and plate particle‐SCO 2 MPBE with these five SCO 2 channel configurations was conducted 25 …”

Section: Introductionmentioning

confidence: 99%

“…A comparative study on the thermal-hydraulic behavior of a shell and plate particle-SCO 2 MPBE with these five SCO 2 channel configurations was conducted. 25 Aside from steady-state analysis, dynamic modeling and transient analyses concerning SCO 2 -based heat exchangers have also been investigated. Early in 2005, Simoes et al proposed a dynamic model of a double-pipe heat exchanger for heating SCO 2 by hot water.…”

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confidence: 99%

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Dynamic characteristics of a shell and plate particle‐SCO ₂ moving packed bed heat exchanger with various SCO ₂ channel configurations

Yin

Zheng

Zhang

2020

Intl J of Energy Research

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This article proposes a dynamic analysis framework for a shell and plate particle-SCO 2 moving packed bed heat exchanger (MPBE) with straight SCO 2 channel and four fins-modified SCO 2 channels, which contains a static model and a dynamic model. 13 cases covering an initial temperature deviation range of +50 ~−100 K from design-point case in solids inlet, an initial temperature deviation range of +50 ~−100 K from design-point case in SCO 2 inlet, and a SCO 2 inlet velocity range of 1.5 times to 0.05 times are introduced to measure the dynamic characteristics. Dynamic responses of five MPBE configurations to two types of inputs (step-change perturbations and linear-change perturbations) under 13 cases are analyzed. Relaxation times at each case are summarized and compared. A low threshold temperature exists for all five MPBE configurations to avoid oscillations in solids outlet temperature under stepchange perturbations in solids inlet temperature, and a low threshold SCO 2 inlet temperature just appears in MPBE with straight SCO 2 channels under step-change perturbations in SCO 2 inlet temperature. Improved MPBE configurations show apparent less relaxation time than MPBE with straight SCO 2 channel. Among four fins-modified MPBE configurations, MPBE channels modified with offset rectangular fins on SCO 2 side exert the fastest dynamic characteristic in most cases. K E Y W O R D S CSP Gen3, dynamic characteristics, dynamic heat transfer model, particle-SCO 2 moving packed bed heat exchanger | INTRODUCTIONAiming at expediting solar thermal electricity capacity and enhancing solar thermal generation cost competitiveness, research studies concerning the implement of the next generation of concentrated solar power plant (CSP Gen 3) have been gaining colossal vigor recently. [1][2][3] Compared with the first and second CSP plants of which the annual solar-electric efficiency is generally less than 20%, CSP Gen 3 entails the potential to achieve an annual solar-electric efficiency of 25%~30%. 4 The considerable improvement can be ascribed to the elevated peak operating temperature, expecting to be >700 C. Two main technologies matching peak operating temperature Abbreviations: CSP, concentrated solar power plants; MPBE, moving packed bed heat exchanger; SCO 2 , supercritical carbon dioxide; TES, thermal energy storage; PCHE, printed circuit heat exchanger.

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Section: Model Establishmentmentioning

confidence: 99%

Section: Static Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamic characteristics of a shell and plate particle‐SCO ₂ moving packed bed heat exchanger with various SCO ₂ channel configurations

Yin

Zheng

Zhang

2020

Intl J of Energy Research

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“…Given the growing need for cooling and heat transfer systems, increasing the efficiency of cooling systems has become a very important challenge for researchers 1 . Heat pipes are among the most effective and applicable devices in this field.…”

Section: Introductionmentioning

confidence: 99%

The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

et al. 2021

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Summary Heat pipes are useful devices in heat transfer and particularly, in cooling systems. Given the high demand for cooling systems in various applications, an improvement in the performance of heat pipes has gained much attraction in recent years. In this study, the effects of utilizing working fluids with different thermal properties on the performance of pulsating heat pipes (PHP) are experimentally studied. Hence, nano‐encapsulated phase change material (NPCM), reduced graphene oxide nanosheets, and their mixture, as a novel hybrid nanofluid, are prepared and dispersed in water as a working fluid. NPCM at 3 concentrations of 5, 10, and 20 g/L, as well as nanosheets at three concentrations of 0.3, 0.6, and 1.2 g/L, are synthesized and investigated. Moreover, both additives are mixed at five various concentrations to form a hybrid nanofluid. All experiments are conducted in the vertical orientation and filling ratio of 50%. It is found that due to the increase in viscosity with the increment of concentration, the highest concentration is not always the optimum concentration and the PHP's performance for each additive is optimized in a specific concentration. NPCMs could prevent the working fluid's temperature to rise by changing the phase, as a result, the effective specific heat of the working fluid is slightly augmented. Also, the thermal conductivity of the working fluid increased up to 13% using nanosheets. It is illustrated that using the mixture of nanosheets and NPCM leads to a 38% decline in thermal resistance. Meanwhile, it is found that the enhancement in the thermal performance of the PHP using nanofluids is not only purely due to the increase in thermal properties of nanofluids but also due to the increase in turbulence intensity and boiling nucleation sites created by the nanoparticles. Highlights Nano‐encapsulated phase change material (PCM), reduced graphene oxide (RGO) nanosheets, and their mixture are used as working fluid in a pulsating heat pipe (PHP). The thermal performance of PHP is improved using PCM nanocapsules, RGO nanosheets, and their mixture. Nanosheets have a higher impact on the performance of PHP compared with nano‐encapsulated PCM. The better performance of PHP using RGO nanosheets is due to the higher thermal conductivity and mixing of fluid containing them compared with pure water. The better performance of PHP using nanocapsules is attributed to the better mixing of the fluid.

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Heat transfer model for moving packed-bed particle-to-sCO2 heat exchangers integrated with metal foams

Mishra,

Singh,

2024

Applied Thermal Engineering

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Comparative study on the thermal-hydraulic performance of a shell and plate particle-SCO2 moving packed bed heat exchanger with various channel configurations

Cited by 15 publications

References 30 publications

Dynamic characteristics of a shell and plate particle‐SCO ₂ moving packed bed heat exchanger with various SCO ₂ channel configurations

Dynamic characteristics of a shell and plate particle‐SCO ₂ moving packed bed heat exchanger with various SCO ₂ channel configurations

The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

Heat transfer model for moving packed-bed particle-to-sCO2 heat exchangers integrated with metal foams

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Comparative study on the thermal-hydraulic performance of a shell and plate particle-SCO2 moving packed bed heat exchanger with various channel configurations

Cited by 15 publications

References 30 publications

Dynamic characteristics of a shell and plate particle‐SCO 2 moving packed bed heat exchanger with various SCO 2 channel configurations

Dynamic characteristics of a shell and plate particle‐SCO 2 moving packed bed heat exchanger with various SCO 2 channel configurations

The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

Heat transfer model for moving packed-bed particle-to-sCO2 heat exchangers integrated with metal foams

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Dynamic characteristics of a shell and plate particle‐SCO ₂ moving packed bed heat exchanger with various SCO ₂ channel configurations

Dynamic characteristics of a shell and plate particle‐SCO ₂ moving packed bed heat exchanger with various SCO ₂ channel configurations