A Software for Calculating the Economic Aspects of Floating Offshore Renewable Energies

[Abstract] The aim of this work is to develop a software to calculate the economic parameters so as to determine the feasibility of a floating offshore renewable farm in a selected location. The software can calculate the economic parameters of several types of offshore renewable energies, as follows: one renewable energy (floating offshore wind—WindFloat, tension leg platform (TLP), and spar; floating wave energy—Pelamis and AquaBuoy), hybrid offshore wind and wave systems (Wave Dragon and W2Power), and combined offshore wind and waves with different systems (independent arrays, peripherally distributed arrays, uniformly distributed arrays, and non-uniformly distributed arrays). The user can select several inputs, such as the location, configuration of the farm, type of floating offshore platform, type of power of the farm, life-cycle of the farm, electric tariff, capital cost, corporate tax, steel cost, percentage of financing, or interest and capacity of the shipyard. The case study is focused on the Galicia region (NW of Spain). The results indicate the economic feasibility of a farm of floating offshore renewable energy in a particular location in terms of its costs, levelized cost of energy (LCOE), internal rate of return (IRR), net present value (NPV), and discounted pay-back period. The tool allows for establishing conclusions about the dependence of the offshore wind resource parameters, the main distances (farm–shore, farm–shipyard, and farm–port), the parameters of the waves, and the bathymetry of the area selecte

The Decarbonisation of Galicia Using Renewable Marine Energy

Paper: 19th International Conference on Renewable Energies and Power Quality (ICREPQ’21) Almeria (Spain), 28th to 30th July 2021[Abstract] The objective of this paper is to examine the importance of independent arrays in the offshore renewable energy farms. In this context, several scenarios have been contemplated for a floating offshore renewable energy farm: a farm only using floating wave energy; a farm only using floating offshore wind energy; and a farm composed by floating wave energy and floating offshore wind energy installed in independent arrays. The article proposes a method to calculate the main economic parameters and decide their economic feasibility. A hypothetic offshore renewable energy farm located in the Galicia region (Spain) has been studied as case of study. Results show which of the scenarios has the best economic results. This method is worthwhile to compare different floating offshore renewable energy technologies in economic terms and help in the decision making of this new emerging sector that can help to rebuild Europe in the post-pandemic period.This research was funded by Project PID2019-105386RA-I00 “Design of a tool for the selection of offshore renewable energy locations and technologies: application to Spanish territorial waters (SEARENEW)”, financed by Ministerio de Ciencia e Innovación – Agencia Estatal de Investigación/10.13039/50110001103

Evaluación del nivel de legibilidad de contratos EPC redactados en español e inglés para obras industriales

En el mundo de la obra industrial, los megaproyectos se gestionan y contratan de forma habitual utilizando contratos del tipo EPC (Engineering, Procurement and Construction), comúnmente denominados «llave en mano». A la complejidad técnica inherente a la ejecución y control de estos megaproyectos se une normalmente la dificultad de entender los términos y las condiciones que han fijado despachos de abogados, generalmente de prestigio en el momento de su negociación y firma. Con base en la experiencia de los autores en la gestión de varios megaproyectos, este estudio trata de poner en relevancia el nivel de legibilidad de estos contratos. Para ello se utiliza la formulación Flesch Reading Ease Score (FRES), analizando varias cláusulas de alguno de estos contratos tipo EPC, comparándolas con los tres modelos de contratación de referencia internacionales y evaluando el impacto del idioma en el que están redactados. El resultado obtenido en la determinación del nivel de legibilidad (readability en inglés) muestra que, en general, se requiere un nivel de formación específica y de capacitación profesional muy elevado para poder entender lo redactado. Además, el estudio concluye que las cláusulas escritas en español son más complejas que las cláusulas escritas en inglés, un déficit que parte de la propia naturaleza del idioma, que emplea en general más palabras en cada frase, y al que se suma al hecho de que la formación en expresión oral y escrita en las carreras técnicas impartidas en España es prácticamente inexistente

The Wear Responses of the Welded Joints of ASTM A335 Gr. P11 Steels Affected by Accelerated Flow Corrosion

[Abstract] This study shows the efects of wear on welded joints of ASTM A355 Gr. P11 “Seamless Ferritic Alloy-Steel Pipe for High Temperature Service” steels subjected to the welding procedures established by codes B31.1 and ASME III. The standard welding procedure establishes the following steps: a preheating process, welding and post-weld heat treatment. This generates a wear behavior that depends on the thermal cycles to which the diferent areas of the joint are subjected. The objective of this article was the study of the behavior against the flow-accelerated corrosion of the welded joints of a low alloy steel. There is the possibility of establishing welding procedures other than those established, while maintaining the safety ranges, depending on the field of application for the steel

Economic Aspects of a Concrete Floating Offshore Wind Platform in the Atlantic Arc of Europe

[Abstract] The objective of this paper is to examine the economic aspects of a concrete offshore wind floating platform in the Atlantic Arc of Europe (Portugal and Spain). The life-cycle cost of a concrete floating offshore wind platform is considered to calculate the main economic parameters that will define the economic feasibility of the offshore wind farm. The case of study is the concrete floating offshore wind platform Telwind®, a spar platform with a revolutionary way of installing using a self-erecting telescopic tower of the wind turbine. In addition, the study analyses thirteen locations in Spain and twenty in Portugal, including the Atlantic islands of both countries. Results indicate that the economically feasible location to install a concrete o shore wind farm composed of concrete platforms is the Canary Islands (Spain) and Flores (Portugal).European Commission; 344/2016 ARCWIN

Analysis of the Real Energy Consumption of Energy Saving Lamps

[Abstract] Light emitting diode (LED) and compact fluorescent light (CFL) lamps are widely used because they are associated with low energy consumption and a reduced environmental impact. In the present paper, a study of the real consumption of these devices has been carried out. To do this, the active, reactive, distortion and apparent power and electrical efficiency for various lamps have been measured and calculated. The distortions produced in the network provoke the consumed energy to be in the order of 50–75% higher than that which appears in the commercial characteristics. This situation means that for its operation, it is necessary to generate and distribute an amount of energy much higher than that which is declared as the consumption of these lamps, and so far, this amount of energy is neither quantified nor invoiced. Additionally, groups of lamps have also been studied to check whether, when working together on the same network, there is a compensation phenomenon that reduces the negative effects of individual lamps. We have found that this compensation effect does not occur for the type of devices evaluated

Characterisation of electrical power systems based on electrical curves and their properties

[Abstract]: Due to the proliferation of renewable energy systems, the study of voltage and frequency stability is a crucial aspect. Recently, this problem has been approached from a purely geometrical point of view with interesting results. The present work investigates the properties of the so-called electrical curves described by arbitrary voltage or current vectors in Euclidean spaces. Through the invariants of these curves, certain indices can be constructed to detect abnormal operation or irregular characteristics in electrical power systems. Different scenarios and examples have been solved in this work to support the proposed theory

La mujer en el campo científico, tecnológico y transferencia del conocimiento en Galicia: situación actual y actuaciones futuras

[Resumen] La publicación que se presenta pretende realizar un estudio cuantitativo de la situación actual de la mujer en el campo científico, tecnológico y de transferencia del conocimiento en Galicia y su tendencia previsible en los próximos años. Todo eso permitirá obtener un conjunto de resultados para la potencial aplicación de actuaciones que persigan una mayor igualdad de género en este campo en la comunidad autónoma gallega

DSUALMH-A new high-resolution dataset for NILM

[Abstract]: The optimisation of energy consumption requires a reasonably accurate measurement, so an appropriate and advanced monitoring system of the relevant electrical variables in the electrical installations is of paramount importance. In this context, interoperable and highly configurable devices play a crucial role. A clear example is the OpenZMeter (OZM) which is an open source, open hardware, multi-purpose precision smart meter that can measure a wide range of electrical variables at a high sampling rate and provide processed data on power quality. The aim of this work is to show the use and possible applications of the new high sampling frequency data provided by the OZM device, which are much richer and more accurate than those obtained with other low-cost electrical meters. For this purpose, the opensource tool NILMTK has been used and adapted. Likewise, the use of two of the best known and most widely used algorithms such as Combinatorial Optimisation (CO) and the Factorial Hidden Markov Model (FHMM) has been considered, analysing the results obtained in the experimental study and offering a detailed comparison of the performance of the two different disaggregation algorithms using metrics for the different cases, as well as the incorporation of transients, and the comparison with other public DatasetsMinisterio de Ciencia, Innovación y Universidades; PGC2018-098813-B-C33Universidad de Almería; UAL2020-TIC-A208