Entropy flow and generation in radiative transfer between surfaces

Zhang, Z.M.; Basu, Soumyadipta

doi:10.1016/j.ijheatmasstransfer.2006.07.009

Cited by 36 publications

(26 citation statements)

References 22 publications

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“…The reader will realize that the prediction of our theory, in the far-field limit, for entropy transfer is in contradiction with that of Zhang and Basu. 7 The difference in results is because of the differences in assumptions between our work and that of Zhang and Basu. 7 Our assumption is that the interfaces are perfectly smooth and planar surfaces at which waves undergo coherent scattering.…”

Section: Determining Entropy Densitymentioning

confidence: 71%

“…7 In the intervening six years, not much has changed with respect to our knowledge of entropy transfer in the presence of near-field effects. In this paper, we show how near-field entropy density and flux in a planar vacuum cavity between two half-spaces at different temperatures can be determined.…”

Section: Introductionmentioning

confidence: 99%

“…12 The key result of the works of von Laue and Barakat and Brosseau useful for this paper is that the total entropy of two incoherent pencils of radiation is the sum of the entropies of the two pencils. There have been other works also expounding on the entropy of far-field thermal radiation, 7,[16][17][18][19] all of which rely on Planck's theory of thermal radiation.…”

Section: Introductionmentioning

confidence: 99%

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Theory of thermal nonequilibrium entropy in near-field thermal radiation

Narayanaswamy

Zheng

2013

Phys. Rev. B

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We propose a theoretical formalism to evaluate the entropy density and entropy flux that takes into account near-field effects, i.e., interference, diffraction, and tunneling of waves. Using the fluctuation-dissipation theorem, expressions for entropy density and entropy flux in a vacuum cavity between planar multilayered media are derived in terms of local density of photons, local density of accessible microscopic states, and velocity of energy transmission. The proposed method is used to determine the maximum work that can be extracted and a thermodynamic limit of the energy conversion efficiency that can be obtained in near-field thermal radiation.

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Section: Determining Entropy Densitymentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theory of thermal nonequilibrium entropy in near-field thermal radiation

Narayanaswamy

Zheng

2013

Phys. Rev. B

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“…Zhang and Basu [6] investigated entropy flow and generation in radiative transfer between nonideal surfaces when incoherent multiple reflections are significant. The concept of partial equilibrium was applied to interpret the monochromatic radiation temperature of thermal radiation.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Entropy flow, entropy generation, exergy flux, and optimal absorbing temperature in radiative transfer between parallel plates

Chen

et al. 2010

Front. Energy Power Eng. China

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Entropy flow, entropy generation, exergy flux, and optimal absorbing temperature in radiative transfer between parallel plates Abstract Taking nonequilibrium radiative heat transfer between two surfaces as an example, the nonequilibrium thermodynamics of radiation is studied and discussed. The formulas of entropy flow, entropy generation, exergy flux, and optimal temperature of absorbing surface for maximum exergy output are derived. The result is a contribution to the thermodynamic analysis and optimization of solar energy utilization and can be applied in more complex radiative heat transfer cases.

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“…Boltzmann in 1884 investigated the thermodynamics of radiation in an isothermal enclosure and also determined the associated entropy flux to be s b (T)= 3 4 3 T σ . Zhang et al paid attention to the entropy associated with the emission, transmission, and reflection processes of thermal radiation by a surface, which is opaque or semi-infinite, or a semitransparent slab [1]. Furthermore, the entropy generation during radiative transfer between two isothermal diffuse-gray surfaces is analyzed.…”

mentioning

confidence: 99%

Investigation of the entropy generation and efficiency of a solar thermophotovoltaic system

2010

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Based on the second law of thermodynamics, a theoretical model is established for efficiency analysis and optimization of a solar thermophotovoltaic (STPV) system. The entropy generation in the photo-electricity conversion process is numerically calculated and analyzed for the component modules involved in the whole system assembly. The effects of the emitter temperature, concentration ratio, energy bandgap, cell temperature and the transmissivity of the filter on the entropy and the efficiency are investigated. Meanwhile, the conversion efficiencies of the modules are discussed. The following results are obtained: at first the entropy generation of the system reduces but then increases with the rise of the emitter temperature. When the concentration ratio improves, the entropy generation of the system falls. The increase of the bandgap value and chemical potential of the cell also causes the reduction of the entropy generation. Along with the increase of the cell temperature, the entropy generation increases and the conversion efficiency of the STPV system decreases. STPV, entropy generation, efficiency, photon-electron conversion Citation:Chen X, Xuan Y M, Han Y G. Investigation of the entropy generation and efficiency of a solar thermophotovoltaic system.

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Entropy flow and generation in radiative transfer between surfaces

Cited by 36 publications

References 22 publications

Theory of thermal nonequilibrium entropy in near-field thermal radiation

Theory of thermal nonequilibrium entropy in near-field thermal radiation

Entropy flow, entropy generation, exergy flux, and optimal absorbing temperature in radiative transfer between parallel plates

Investigation of the entropy generation and efficiency of a solar thermophotovoltaic system

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