Experimental study of the thermal behavior of direct absorption parabolic trough collector by applying copper metal foam as volumetric solar absorption

Valizade, M.; Heyhat, Mohammad Mahdi; Maerefat, Mehdi

doi:10.1016/j.renene.2019.05.112

Cited by 75 publications

(24 citation statements)

References 26 publications

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“…Copper is selected as the absorber material because of its high temperature sustainability, thermal conductivity [2], and fabrication easiness. In fact, Cu nano-structures have recently exhibited promising values for solar heat absorbers [9,33]. Wavelength-dependent optical constants of Cu in Ref.…”

Section: Design Objectives and Factorsmentioning

confidence: 99%

Optimizing effectiveness and robustness for solar heat absorbers composed of a periodically nano-structured surface

Chen

2019

SN Appl. Sci.

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This work studies solar heat absorbers having periodic and rectangular nano-pillars on their surfaces. Design factors are periods, filling ratios, and pillar height. They are tailored using the design of experiments for absorption effectiveness and robustness. The former requires enlarging absorption within the solar spectrum as well as diminishing re-emission loss at long wavelengths. The latter refers to independence of absorption effectiveness from noise interference. Studied noise factors include dimensional deviations and variation of sunlight orientation. Effects from individual design factor and interactions between two design factors are all investigated. The selected absorbers exhibit appealing wavelengthselective absorptance spectra. Absorption effectiveness and robustness of these absorbers are quantitatively illustrated by a large response variable Q and its small variation S, respectively.

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Section: Design Objectives and Factorsmentioning

confidence: 99%

Optimizing effectiveness and robustness for solar heat absorbers composed of a periodically nano-structured surface

Chen

2019

SN Appl. Sci.

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“…An excellent review on porous foam applications in solar systems was provided by Rashidi et al 5 More recently, Mousavi et al, 6 Lu and Chen, 7 Mohebbi et al, 8 Valizade et al, 9 Jouybari and Lundström, 10 and Tan et al 11 have contributed with some important findings in this field.…”

Section: Introductionmentioning

confidence: 99%

Porous foams and nanofluids for thermal performance improvement of a direct absorption solar collector: An experimental study

Hooshmand

Zahmatkesh

Karami

et al. 2021

Env Prog and Sustain Energy

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In this study, attention is focused to examine experimentally how utilization of porous foams, as well as nanofluids, may improve thermal performance of a residential-type direct absorption solar collector (DASC). The experiments are undertaken for SiC ceramic as the porous foam and SiC-water suspension as the nanofluid.Three levels are chosen for the reduced temperature difference, the porous foam, and the volumetric flowrate while four levels are selected for the nanoparticle concentration. To determine the relative importance of each of the involved parameters on thermal efficiency of the DASC, an ANOVA is undertaken. The best thermal performance is achieved in a case having both the metal foam and the nanoparticles.The maximum rises in thermal efficiency due to the insertion of the porous foam and the inclusion of the nanoparticles are recorded to be 14% and 37%, respectively. However, it is found that the volumetric flowrate is the dominant parameter in this system in a way that the inclusion of the porous foam or the nanoparticles deteriorates its role. Comparison of the results of the two porous foams demonstrates that the foam having higher porosity and pore density leads to higher thermal efficiency.

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“…It should be noted that in most of them, air and ceramic foams are used as the HTF and porous media, respectively. Few studies have considered the volumetric receiver occupied by a liquid saturated metal foam . Recently, Valizade et al investigated the application of copper metal foam in a direct absorption PTC at different mass flow rates, inlet temperatures, and porous insert configurations.…”

Section: Introductionmentioning

confidence: 99%

“…Few studies have considered the volumetric receiver occupied by a liquid saturated metal foam . Recently, Valizade et al investigated the application of copper metal foam in a direct absorption PTC at different mass flow rates, inlet temperatures, and porous insert configurations. It is found that using the full porous configuration, the efficiency of the collector increases by up to 171% compared to the porous‐free tube.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of a direct absorption solar collector using copper oxide porous foam and nanofluid

Esmaeili

Karami

Delfani³

2020

Int J Energy Res

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The current research proposes the idea of using water-saturated metal oxide foams and water-based nanofluids as solar absorber in the direct absorption solar collectors (DASCs). Specifically, the novel solar collector design utilizes copper oxide (CuO) porous foam and nanoparticle with high optical properties and is expected to have enhanced thermal performance than the conventional collectors utilizing pure water. The finite volume technique is used to solve the governing equations of flow and heat transfer in the radiative participating media. Also, to establish the reliability and accuracy of numerical solutions, the obtained results are compared with the corresponding numerical and experimental data. The computations are carried out for different nanoparticle volume fractions, foam pore sizes, working fluid mass flow rates, and both porous layer thicknesses and positions (inserted at the lower or upper wall of the collector). It is found that the efficiency of DASC partially/fully filled with metal oxide foam is maximized when the collector is completely filled with it. Compared with the water flow, the numerical results show that the collector efficiency using CuO nanofluid and metal oxide foam is improved by up to 26.8% and 23.8%, respectively. Moreover, considering the second law of thermodynamics, the use of CuO nanofluids in the DASC seems to be more effective than the use of CuO porous foam. K E Y W O R D Sdirect absorption solar collector, efficiency, metal oxide foam, nanofluid, second law of thermodynamics

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Experimental study of the thermal behavior of direct absorption parabolic trough collector by applying copper metal foam as volumetric solar absorption

Cited by 75 publications

References 26 publications

Optimizing effectiveness and robustness for solar heat absorbers composed of a periodically nano-structured surface

Optimizing effectiveness and robustness for solar heat absorbers composed of a periodically nano-structured surface

Porous foams and nanofluids for thermal performance improvement of a direct absorption solar collector: An experimental study

Performance enhancement of a direct absorption solar collector using copper oxide porous foam and nanofluid

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