Browsing by Autor "Idalberto Herrera Moya"

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An Assessment of Urban Wind Potential and the Stakeholders Involved in Energy Decision-Making
(2023) Alexander Vallejo Díaz; Idalberto Herrera Moya; Edwin Garabitos Lara; Cándida K. Casilla Victorino
Urban wind energy has emerged as an attractive source of distributed generation in cities to achieve sustainable development goals. The advance in technologies for the use of urban wind energy has turned this source into an attractive alternative for the decarbonization of cities and the energy transition. The objectives of this work are (1) to identify the potential of wind energy through numerical weather prediction (NWP) data tools and (2) to identify the roles and responsibilities of the stakeholders involved in the decision-making process. A methodology was developed in two phases and applied to a case study in the Dominican Republic. The first phase consisted of estimating the wind energy potential for the 32 provinces at a height of 10 m using open-access geographic reference systems tools provided by NASA. In the second phase, 28 stakeholders were identified through snowball sampling. The Responsible, Accountable, Consult, and Informed (RACI) matrix tool was applied to identify the roles of the 28 institutions addressed at the country level as relevant in the decision-making process for the energy sector. The annual average wind speed and energy potential for each province were determined. It was found 24 provinces have poor potential, below &amp;lt;4.5 m/s. In the northwest and east is where there is the greatest potential, between 4.83 - 6.63 m/s. The population density was established and was observed that the provinces with greater potential are less densely populated. Through 59 interviews 28 institutions were identified and evaluated due to their relevance in decision-making for the implementation of energy projects. The MEM has strongly categorized as “A”, electricity distribution companies as “R”, energy associations and universities as “C”, and educational and justice institutions as “I”.
Exergía del producto sólido obtenido por la pirólisis del marabú y el bagazo de caña de azúcar
(2007) Bárbaro Fidel Medina Álvarez; P. Roque Díaz; Ángel Rubio; Idalberto Herrera Moya; Rolando Zanzi
En este trabajo se presentan los valores de exergía química de marabú, bagazo de caña de azúcar y de los carbonizados de ambas biomasas, obtenidos a diferentes temperaturas de pirólisis. El método de cálculo empleado fue propuesto por Manfrida G, [1], Se determinó experimentalmente la composición elemental de las biomasas y sus carbonizados en un analizador Carlo ErbaFisons EA-1108, informándose los datos libres de humedad y cenizas. Posteriormente se calculó el calor específico de combustión superior Qs en el rango de temperatura comprendido entre 30 y 800oC, empleando la fórmula reportada por Cukierman, [2]. Los datos de exergía obtenidos son superiores a los del Qs para ambas biomasas y sus carbonizados; alcanzándose los máximos valores a la temperatura de 800oC, siendo de 33,4 y 34,6 MJ/kg para el bagazo de caña de azúcar y el marabú respectivamente. Se presentan los gráficos de destrucción de la exergía de la biomasa durante la pirólisis de la misma.
Techno-economic assessment of battery systems in the PV self-consumption without surpluses in the residential tariff of the Dominican Republic
(Elsevier BV, 2025) Edwin Garabitos-Lara; Alexander Vallejo Díaz; Carlos Napoleón Pereyra Mariñez; Idalberto Herrera Moya
This study develops a techno-economic model to evaluate the feasibility of battery energy storage systems (BESS) integrated into photovoltaic (PV) self-consumption schemes without surplus injection under the Dominican Republic's residential tariff. Hourly consumption data from three real households were analyzed, defining three representative demand levels—low, medium, and high. System sizing was optimized by maximizing net present value (NPV) while assessing internal rate of return (IRR), self-consumption ratio (SCR), self-sufficiency ratio (SSR), levelized cost of energy (LCOE), and a proposed parity index (PI). Results indicate that PV self-consumption is profitable only for high-demand users (≥ 701 kWh month −1 ), achieving grid parity (PI ≈ 1.0; IRR ≈ 10 %). Battery integration raises SCR from 73.4 to 98.3 % and SSR from 34 to 45 %, however reduces profitability because of higher capital investment. Profitability is highly sensitive to the hourly demand profile: redistributing identical daily consumption improved NPV by up to 16 %. Removing the residential subsidy slightly enhances profitability for low- and medium-demand users, while high-demand users lose competitiveness. A 30 % reduction in battery cost increases NPV by 18 % for high-demand profiles but remains insufficient for others. These results confirm that PV + BESS are technically and economically viable for high-demand consumers, strengthening energy autonomy and resilience in countries with similar tariffs and solar resources. • Develops a techno-economic model for PV + BESS non-export self-consumption systems • Finds PV self-consumption viable only for high-demand users (≥ 701 kWh month −1 ) • Integrating BESS raises SCR by 25 % and SSR by 11 % but reduces profitability • Profitability strongly depends on the hourly match between demand and generation • Proposes a parity index (PI) transferable to emerging economies with similar tariffs