Optimal design of the ocean thermal energy conversion systems involving weather and energy demand variations

Hernández-Romero, Ilse María; Nápoles‐Rivera, Fabricio; Flores‐Tlacuahuac, Antonio; Fuentes-Cortés, Luis Fabián

doi:10.1016/j.cep.2020.108114

Cited by 12 publications

(4 citation statements)

References 44 publications

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“…OTEC systems require a minimum 20 K thermal gradient between surface and deep water to achieve maximum efficiency [36]. At both locations, a temperature differential of 20 K can be attained through the usage of cold seawater above 500 m. The thermocline is limited to a depth of 525 m to reduce the pressure drop of cold seawater through the CWP.…”

Section: -4-seawater Pipementioning

confidence: 99%

System Parameters Sensitivity Analysis of Ocean Thermal Energy Conversion

Rasgianti,

Adiputra,

Nugraha

et al. 2024

Emerg Sci J

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Ocean Thermal Energy Conversion (OTEC) is a technology to harvest the solar energy stored in the ocean by utilizing the temperature difference between warm surface and cold deep seawater. Considering that the OTEC system works in a low-temperature range, the present paper assessed the technical resources comprehensively by acquiring in-situ thermocline data and conducting a sensitivity analysis of the system parameters. The in-situ temperature profile data were measured in the waters of North Bali, Indonesia. The temperature gradient data based on field measurements were then compared with the HYCOM consortium model. The data were then used as input in the OTEC power and efficiency estimation through a single-stage ranking cycle. The analysis was conducted by varying the type of working fluid, the performance of the heat exchanger, and the location to investigate how the system parameters influenced the power produced. Using an unusual combination of parameters made it difficult to analyze the resulting data multiple times. However, with reference-based analysis and the formulation of calculations, the sensitivity of each parameter could be assessed at both locations. As a result, the ammonia working fluid provided the highest net power output of the system but had the lowest efficiency of all working fluids. The heat exchanger performance in terms of net power and efficiency cannot be separated from the seawater mass flow requirement. This referred to the results where the heat exchanger with a temperature difference of 3°C before and after the seawater passed through the heat exchanger and produced the highest net power and efficiency. Additionally, the net power output reached its convergence level at a water depth of 400m for the Bungkulan site and 450m for Celukan Bawang, which was proportional to the thermocline tendency. Doi: 10.28991/ESJ-2024-08-02-04 Full Text: PDF

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Section: -4-seawater Pipementioning

confidence: 99%

System Parameters Sensitivity Analysis of Ocean Thermal Energy Conversion

Rasgianti,

Adiputra,

Nugraha

et al. 2024

Emerg Sci J

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“…On the same note, researchers found the optimal design for a small-scale co-generation system using an ORC, maximizing electrical and cooling power whilst minimizing the overall conductance of the cycle [80]. Most of the works considered using the -constraint method to find the Pareto optimum for the problem [81][82][83].…”

Section: Application Of Moo To Energy Production Storage and Distribu...mentioning

confidence: 99%

Applications of Multi-Objective Optimization to Industrial Processes: A Literature Review

2022

Self Cite

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Industrial processes provide several of the products and services required for society. However, each industry faces different challenges from different perspectives, all of which must be reconciled to obtain profitable, productive, controllable, safe and sustainable processes. In this context, multi-objective optimization has become a powerful tool to aid the decision-making mechanism in the synthesis, design, operation and control of such processes. The solution to the mathematical models provides the necessary tools to asses the system performance in terms of different metrics and evaluate the trade-offs between the objectives in conflict. The number of applications of multi- objective optimization in industrial processes is ample and each application has its own challenges. In the present literature review, a broad panorama of the applications in multi-objective optimization is presented, including future perspectives and open questions that still need to be addressed.

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“…The Earth receives enough energy from the sun every year to supply its needs [1]. Ocean thermal energy conversion (OTEC) utilizes the temperature difference between warm surface seawater and deep cold seawater as the heat source to realize the utilization of ocean thermal energy [3], possessing the advantages of huge reserves [4], continuous stability, natural cleaning and other characteristics [5,6], with a power generation potential of about 150 million kW [7]. Compared with other ocean clean energy sources, OTE is considered to be the worthiest due to its advantages in terms of high energy density and small power generation fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Analysis of a 100 kW Radial Turbine for an Ocean Thermal Energy Conversion–Organic Rankine Cycle Power Plant

Feng,

Li,

Huang

et al. 2023

Processes

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In this paper, a 100 kW radial inflow turbine is designed for an ocean thermal energy conversion (OTEC) power plant based on the organic Rankine cycle (ORC) with ammonia as the working fluid. Based on one-dimensional (1D) and three-dimensional computational fluid dynamics (3D-CFD) modeling, the mechanical structure design, static and modal analyses of the turbine and its components are carried out to investigate its mechanical performance. The results show the stress and strain distribution in the volute, stator and rotor, and their maximum values appear, respectively, at the inlet cutout, the tip of the stator outlet and the connection position between the rotor and the shaft. After optimization, all the stresses in the above components are below the allowable values. The frequencies from the first order to the sixth order of the rotor and whole turbine were obtained through modal analysis without prestress and under prestress. The maximum frequency of the rotor and whole turbine is 707.75 Hz and 40.22 Hz, both of which are far away from the resonance frequency range that can avoid resonance. Therefore, the structure of the designed turbine is safe, feasible and reliable so as to better guide actual production.

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Optimal design of the ocean thermal energy conversion systems involving weather and energy demand variations

Cited by 12 publications

References 44 publications

System Parameters Sensitivity Analysis of Ocean Thermal Energy Conversion

System Parameters Sensitivity Analysis of Ocean Thermal Energy Conversion

Applications of Multi-Objective Optimization to Industrial Processes: A Literature Review

Structural Design and Analysis of a 100 kW Radial Turbine for an Ocean Thermal Energy Conversion–Organic Rankine Cycle Power Plant

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