Ocean exergy and energy conversion systems

Miguel, António F.; Aydın, Murat

doi:10.1504/ijex.2012.047507

Cited by 7 publications

(10 citation statements)

References 50 publications

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“…Numerous studies have been devoted in the last two decades to assess the exergy of different potential sources of energy, such as solar radiation (Edalati et al, 2016;Kurtgoz and Deniz, 2016), wind (Öztürk, 2011) or the various marine options (Bryden et al, 2007;Miguel and Aydin, 2012;Liberti et al, 2013). In this sense, tidal currents appear to be one of the most promising sources for green energy (O'Rourke et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Quantification of the tidal stream exergy in the ría de Vigo (NW Spain)

Mestres

Griñó

Sierra

et al. 2017

IJEX

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Abstract:The exergy of the tidal currents in the ría de Vigo area (NW Spain) is quantified using the results of a 28-day long simulation of the tidal flows. The results show that the northernmost strait connecting the ría with the Atlantic Ocean is a promising site for tidal energy tapping, in contrast with the energetically weaker estuary. On the basis of the average power density (APD), a 7.5 km 2 region is identified in this strait as the most advantageous area to install tidal energy converters (TECs), with a total annual exergy of around 2 M. Mestres et al.3865 MWh/m 2 . Similar analyses using only 14-day simulations change this value in 16%, depending on whether the tidal cycle considered is apogean or perigean. The study contributes to enlarge the inventory of sites along the NW Spanish coast at which tidal stream energy can be potentially extracted.

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Section: Introductionmentioning

confidence: 99%

Quantification of the tidal stream exergy in the ría de Vigo (NW Spain)

Mestres

Griñó

Sierra

et al. 2017

IJEX

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“…Nature also shows that work can be completely converted into heat, but heat can only be partially converted into work (second law of thermodynamics). Exergy is an extensive property, and represents the ability to produce work [9][10][11][12]30]. It decreases when work is produced, and thus exergy loss follows exergy transfer.…”

Section: Energy Entropy and Exergymentioning

confidence: 99%

“…Exergy is conserved for reversible processes, but is not conserved in irreversible processes. It is destroyed whenever an irreversible process occurs, and constitutes a measure of the non-equilibrium from system and the environment [10,11]. Exergy is consumed due to irreversibilities, and the Gouy-Stodola theorem states that the rate of loss of exergy in a process is proportional to entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Towards an Exergy Analysis of Diffusive and Non-Diffusive Processes in Living Organisms

Miguel

2016

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Living organisms are open dissipative thermodynamic systems that rely on mechano-thermo-electrochemical interactions to survive. Plant physiological processes allow plants to survive by converting solar radiation into chemical energy, and store that energy in form that can be used. Mammals catabolize food to obtain energy that is used to fuel, build and repair the cellular components. The exergy balance is a combined statement of the first and second laws of thermodynamics. It provides insight into the performance of systems. In this paper, exergy balance equations for both mammal’s and green plants are presented and analyzed.

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“…Nowadays, there are some central pilot installed in-loco. One of the most important projects with in-loco was the Central Pilot at Pico Island (Portugal) [8,9].…”

Section: Introductionmentioning

confidence: 99%

Constructal Design Applied to Geometric Shapes Analysis of Wave Energy Converters

Gomes

Salvador

Magno

et al. 2021

DDF

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This paper deals with numerical simulation and the geometrical analysis of an ocean Wave Energy Converter (WEC), which has as the operating principle the Oscillating Water Column (OWC). The goal was to evaluate the geometric shape influence of the OWC chamber in the hydropneumatic power available. Therefore, four geometric shapes were analyzed: i) Rectangle (RT), ii) Trapezium (TP), iii) Inverted Trapezium (TI) and iv) Double Trapezium (DT). For this, the OWC device was subject to a JONSWAP wave spectrum with peak period (TS) equal to 7.5 s and peak wave height (HS) equal to 1.5 m. To do so, Constructal Design was employed varying the Degree Of Freedom (DOF) H1/L (ratio between the height and length of the OWC chamber entrance). The problem constraints were the entrance area and the total area of the OWC chamber that were kept constant. For the numerical solution a Computational Fluid Dynamics (CFD) code, based on the Finite Volume Method (FVM),de0 was used. The multiphase Volume of Fluid (VOF) model was applied to tackle with the water-air interaction. The results indicated that when the Rectangle (RT) geometrical shape was employed an improvement of nearly 99% was achieved.

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Ocean exergy and energy conversion systems

Cited by 7 publications

References 50 publications

Quantification of the tidal stream exergy in the ría de Vigo (NW Spain)

Quantification of the tidal stream exergy in the ría de Vigo (NW Spain)

Towards an Exergy Analysis of Diffusive and Non-Diffusive Processes in Living Organisms

Constructal Design Applied to Geometric Shapes Analysis of Wave Energy Converters

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