Thermal Efficiency of Solar Volumetric Receivers Using Constant and Variable Fluid Properties

Lemos, Marcelo J. S. de; Ribeiro, Roberta dos R.

doi:10.1615/interjenercleanenv.2021036949

Cited by 12 publications

(2 citation statements)

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“…An irrigation system was built for a 50 km 2 olive tree farm. Following de Lemos and Ribeiro, 32 variable fluid properties are used in the thermal nonequilibrium approach to simulate volumetric solar receivers. The ratio of solid‐to‐liquid thermal conductivity increases efficiency at lower inlet velocities.…”

Section: Introductionmentioning

confidence: 99%

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Vyas,

Singh,

Agrawal

et al. 2024

Heat Trans

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In this article, a comparative study of different drying techniques, namely, open sun drying (OSD), desiccant drying, solar drying (SD), and solar drying with desiccant (SDWD) was done for drying potato and ginger. The thermal efficiency and air temperature differences of the solar dryer based on evacuated tube collectors were also examined. The average efficiency of the solar dryer was 29.01%. Average drying rates of OSD, desiccant drying, SD, and SDWD bed are 0.435, 0.435, 0.59, and 0.635 g/min. The moisture content of the potato was reduced from 79.6% to 32.9% by OSD, 32.6% by desiccant drying, 9.6% by SD, and 6.9% by SDWD. The moisture content of the ginger was reduced from its initial value of 82.3%–25.3% by OSD, 25% by desiccant drying, 10.1% by SD, and 3.2% by SDWD. SD assisted with a desiccant bed proved to be the best method for drying vegetables. Drying with desiccants is not feasible for drying in winter and spring seasons of the Indian climate.

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Section: Introductionmentioning

confidence: 99%

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Vyas,

Singh,

Agrawal

et al. 2024

Heat Trans

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show abstract

“…1, it is important to emphasize the contribution herein. It is well stablished that global change from carbon-based to carbon-free economy has driven the development of a number of innovative technologies for harvesting non-polluting sources of energy [20]. In parallel, a large number of oil wells are approaching the end of their productive life and will have to be plugged and abandoned by oil and gas operators around the world [21].…”

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confidence: 99%

Thermodynamics of thermite reactions for a new thermal plug and abandonment process

Souza

Lemos

Kawachi

2021

Continuum Mech. Thermodyn.

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Thermites are powerful energetic materials able to release large amounts of energy in a selfpropagating reaction. They have been widely applied in rail welding, pyrotechnics, and material synthesis, as they are highly exothermic. In recent years, there has been an increased interest on applying a thermite reaction in the plug and abandonment of wells due to the possibility of reducing the high cost of this process. However, some primary studies are required to understand these energetic materials and to select the most efficient thermite mixtures to be applied in a plug and abandonment scenario. Although they do not react as simple condensed-phase reactions because of all the complex physicochemical mechanisms involved, they can be characterized and understood by simple principles of thermodynamics. As so, this research presents the importance of the Gibbs free energy concept to determine the candidates of a thermite reaction, in addition to showing how important characteristics of these reactions such as adiabatic temperature and heat released can be calculated using thermodynamic principles. Lastly, the minimization of Gibbs free energy method for determining the final products of a reaction, considering chemical equilibrium, is presented and applied to predict the final products, as a function of temperature, for some of the most powerful thermite mixtures. The conclusion is that, although the 2Al-Fe 2 O 3 thermite reaction has the lower mass and volumetric heat of combustion in comparison with the 2Al-3CuO and 3Be-Fe 2 O 3 thermites, it can reach the highest adiabatic temperature observed due to the lower gaseous mass fraction in the products, which means fewer heat losses due to phase changes. So, the thermite mixture 2Al-Fe 2 O 3 is a promising candidate for the plug and abandonment of mature oil wells. KeywordsThermite • Aluminothermic reactions • Gibbs free energy • Thermodynamics Latin symbols a Chemical activity C p Heat capacity at constant pressure G Gibbs free energy H Enthalpy m Mass n Number of mols Communicated by Andreas Öchsner.

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Thermal Methods for P&A

de Lemos

2024

SpringerBriefs in Applied Sciences and Technology

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Thermal Efficiency of Solar Volumetric Receivers Using Constant and Variable Fluid Properties

Cited by 12 publications

References 0 publications

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Thermodynamics of thermite reactions for a new thermal plug and abandonment process

Thermal Methods for P&A

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