A numerical analysis of the energy and entropy generation rate in a Linear Fresnel Reflector using computational fluid dynamics

López-Núñez, Oscar A.; Alfaro-Ayala, J. Arturo; Jaramillo, O.A.; Ramírez-Minguela, J.J.; Castro, Juan Carlos Montero; Damián, César; Cano-Andrade, Sergio

doi:10.1016/j.renene.2019.06.144

Cited by 23 publications

(10 citation statements)

References 37 publications

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“…As the entropy generation reflected system irreversibility causing by heat transfer irreversibility (HTI) and fluid friction irreversibility (FFI), the local and average entropy generation rate under the LTNE assumption can be formulated as follows [16,17]:…”

Section: Entropy Generation Ratementioning

confidence: 99%

On Numerical Modeling of Thermal Performance Enhancementof a Heat Thermal Energy Storage System Using a Phase Change Material and a Porous Foam

et al. 2022

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In this investigation, a comprehensive numerical analysis of the flow involved in an open-ended straight channel fully filled with a porous metal foam saturated and a phase change material (paraffin) has been performed using a single relaxation time lattice Boltzmann method (SRT-LBM) at the representative elementary volume (REV) scale. The enthalpy-based approach with three density functions has been employed to cope with the governing equations under the local thermal non-equilibrium (LTNE) condition. The in-house code has been validated through a comparison with a previous case in literature. The pore per inch density (10≤PPI≤60) and porosity (0.7≤ε≤0.9) effects of the metal structure were analyzed during melting/solidifying phenomena at two Reynolds numbers (Re = 200 and 400). The relevant findings are discussed for the LTNE intensity and the entropy generation rate (Ns). Through the simulations, the LTNE hypothesis turned out to be secure and valid. In addition, it is maximum for small PPI value (=10) whatever the parameters deemed. On the other hand, high porosity (=0.9) is advised to reduce the system’s irreversibility. However, at a moderate Re (=200), a small PPI (=10) would be appropriate to mitigate the system irreversibility during the charging case, while a large value (PPI = 60) might be advised for the discharging case. In this context, it can be stated that during the melting period, low porosity (=0.7) with low PPI (=10) improves thermal performance, reduces the system irreversibility and speeds up the melting rate, while for high porosity (=0.9), a moderate PPI (=30) should be used during the melting process to achieve an optimal system.

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Section: Entropy Generation Ratementioning

confidence: 99%

On Numerical Modeling of Thermal Performance Enhancementof a Heat Thermal Energy Storage System Using a Phase Change Material and a Porous Foam

et al. 2022

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“…Where ̇, , , , and are mass flow, specific heat, temperature of the output water, ambient temperature, temperature of the input water. Input solar radiation exergy rate is found by following [24];…”

Section: ̇=mentioning

confidence: 99%

Exergoeconomic and exergoenvironmental analysis of the evacuated tube heat pipe; a experimental study

Karabuga

Yakut

Utlu

2021

International Journal of Thermodynamics

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In this paper, the thermodynamic performance of a boroxide-added glass evacuated tube heat pipe (ETHP) is studied, including energy, exergy, environmental, economic analysis, and sustainability index. It has been found that 50,87% of the energy loss of water and 50,86% of the exergy loss of water are caused by radiation. There are 4 collectors each collector 57 pipes as a total of 108 pieces pipes, a hot water tank, a heat exchanger, and a pump in the system. The water is used as a working fluid due to economic and common use in the system. In the result of this experimental study, we calculated energy and exergy efficiencies of the EHTP system as % 22,21 and % 13,68, respectively. In addition, the environmental, exergoenviromental, enviroeconomic, and exergoenviroeconomic values of the EHTP system are found 458,5 kgCO2/day, 456,5 kgCO2/day, 0,003708 $/day and 0.003692 $/day, respectively. Also, the sustainability index of the system is found as 1,159.

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“…To maximize the concentration of solar energy, particular designs decide to install a CPC collector on the upper part of the receiver or focal point with the objective of redirecting solar radiation to the absorbing tube [28]. One of the advantages that make an LFC competitive with respect to a PTC is its simple construction, which implies a lower investment cost; however, optical and geometrical limitations such as shading and blocking between mirrors reduce the degree of efficiency of the collector [27].…”

Section: Linear Fresnel Collectormentioning

confidence: 99%

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A numerical analysis of the energy and entropy generation rate in a Linear Fresnel Reflector using computational fluid dynamics

Cited by 23 publications

References 37 publications

On Numerical Modeling of Thermal Performance Enhancementof a Heat Thermal Energy Storage System Using a Phase Change Material and a Porous Foam

On Numerical Modeling of Thermal Performance Enhancementof a Heat Thermal Energy Storage System Using a Phase Change Material and a Porous Foam

Exergoeconomic and exergoenvironmental analysis of the evacuated tube heat pipe; a experimental study

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