Thermal Design

Hesselgreaves, John E.

doi:10.1016/b978-0-08-100305-3.00007-0

Cited by 6 publications

(7 citation statements)

References 23 publications

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“…In this particular case, the flow, for both MS and CO 2 , is fully-developed turbulent ( Re > 2300), so Gnielinski correlation is recommended [ 18 ], given by Equation (2).

…”

Section: Thermal Model and Boundary Conditions Of The Compact Honementioning

confidence: 99%

“…Finally, friction pressure destruction is calculated by means of the Darcy-Weisbach equation [ 18 ], for both fluids:

where D h (m) is the hydraulic diameter of the duct; ρ (kg/m 3 ) is the average fluid density; u (m/s) is the average fluid velocity; and f D is the Darcy friction factor, that is calculated by the Techo et al correlation [ 18 ], for turbulent flow (

); or the Hägen-Poiseulle correlation [ 18 ], in case of laminar flow (

); finally, the subindex i refers to the each fluid: molten salt or CO 2 .…”

Section: Thermal Model and Boundary Conditions Of The Compact Honementioning

confidence: 99%

“…But, at the same time, the MS channel must be larger enough to avoid plugging. To meet both conditions, a small compact shell and tube design [ 18 ] has been modified for the thermal duty and working pressure required by the supercritical cycle. The cross section of this design is a compact shell consisting of many thermal units like the one shown in Figure 2 .…”

Section: Introductionmentioning

confidence: 99%

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Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization

Montes

Linares²,

Barbero

et al. 2020

Entropy

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One of the ways to make cost-competitive electricity, from concentrated solar thermal energy, is increasing the thermoelectric conversion efficiency. To achieve this objective, the most promising scheme is a molten salt central receiver, coupled to a supercritical carbon dioxide cycle. A key element to be developed in this scheme is the molten salt-to-CO2 heat exchanger. This paper presents a heat exchanger design that avoids the molten salt plugging and the mechanical stress due to the high pressure of the CO2, while improving the heat transfer of the supercritical phase, due to its compactness with a high heat transfer area. This design is based on a honeycomb-like configuration, in which a thermal unit consists of a circular channel for the molten salt surrounded by six smaller trapezoidal ducts for the CO2. Further, an optimization based on the exergy destruction minimization has been accomplished, obtained the best working conditions of this heat exchanger: a temperature approach of 50 °C between both streams and a CO2 pressure drop of 2.7 bar.

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“…In this particular case, the flow, for both MS and CO 2 , is fully-developed turbulent ( Re > 2300), so Gnielinski correlation is recommended [ 18 ], given by Equation (2).

…”

Section: Thermal Model and Boundary Conditions Of The Compact Honementioning

confidence: 99%

“…Finally, friction pressure destruction is calculated by means of the Darcy-Weisbach equation [ 18 ], for both fluids:

); or the Hägen-Poiseulle correlation [ 18 ], in case of laminar flow (

); finally, the subindex i refers to the each fluid: molten salt or CO 2 .…”

Section: Thermal Model and Boundary Conditions Of The Compact Honementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization

Montes

Linares²,

Barbero

et al. 2020

Entropy

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show abstract

“…Each flow layer contained 10 microchannels, and the overall area of a microchannel was equal to 5000 mm 2 . The longitudinal conduction in the counter-flow arrangement reduced the heat transfer performance, particularly for high-effectiveness designs. , In the counter-flow C-MHX, the axial gap between the microchannels allowed for pressure equalization due to improved flow distribution and reduced longitudinal wall conduction. Thus, a thermal model was developed to predict the thermal fields of solid material in addition to the hydrodynamics .…”

Section: Qualitative Analysis Of Emerging C-mhx Technologiesmentioning

confidence: 99%

Process Intensification for Compact and Micro Heat Exchangers through Innovative Technologies: A Review

Singh

Montesinos‐Castellanos

Nigam

2019

Ind. Eng. Chem. Res.

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This Review offers quantitative and qualitative analyses of various compact and micro heat exchangers (C-MHXs) in terms of the friction factor, Nusselt number, and heat transfer augmentation mechanism. The C-MHXs, which have already been implemented in industry, are analyzed along with brand-new heat transfer technologies. Pressure drop and Nusselt number are used to characterize the performance of the heat transfer technologies and specifically to ascertain their appropriateness in analyzing C-MHXs. A precise analysis of the correlations reveals that the design parameters must be carefully examined before selecting a suitable correlation. In addition to the quantitative and qualitative analyses, computational fluid dynamics analysis used to design the C-MHXs is also compared with experimental analysis found in the literature. This review of C-MHX technologies will hopefully encourage and motivate more in-depth research into energy-efficient heat transfer devices.

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“…An ideally functioning fin has constant temperature throughout the length of extension, which is equal to its base temperature [7]. The second law analysis of different heat transfer models is given by Bejan [8].…”

Section: Introductionmentioning

confidence: 99%

Entropy Analysis of a Simple Rectangular Radiating Fin for Space Applications

Bhat¹,

Katte²

2020

IJHT

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For growing interest in planetary exploration, it is substantial to study the utilization of energy for future-built planetary settlements, as energy resources are at a premium far away from earth. Entropy analysis is proposed as a suitable tool to study these systems, and make them energy efficient. Hence, a simple, purely radiating rectangular fin is studied by entropy generation analysis. The distribution of temperature and radiosity of the fin is first obtained by solving the governing heat transfer equation by second order finite difference numerical analysis. Using these data, the heat transfer and entropy generation of fin, fin-base, and the surrounding space is calculated. The effect of solar irradiation on the heat transfer of fin is also considered. The influence of pertinent, non-dimensional parameters on the total rate of entropy generated by the fin system is analyzed. Further, a correlation with these parameters is obtained for the total entropy generation.

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Thermal Design

Cited by 6 publications

References 23 publications

Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization

Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization

Process Intensification for Compact and Micro Heat Exchangers through Innovative Technologies: A Review

Entropy Analysis of a Simple Rectangular Radiating Fin for Space Applications

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