Photovoltaic solar energy in the economic optimisation of energy supply and conversion

Delgado, Danielle Bandeira de Mello; Carvalho, Mónica; Coelho, Luiz Moreira; Abrahão, Raphael; Chacartegui, Ricardo

doi:10.1049/iet-rpg.2018.0090

Cited by 20 publications

(16 citation statements)

References 27 publications

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“…In Northeast Brazil, residential-commercial buildings have been the focus of the environmental and economic optimizations presented by Carvalho et al [5] and Delgado et al [6], respectively. A bicriteria synthesis and optimization was presented by Carvalho et al [7] for the city of João Pessoa.…”

Section: Introductionmentioning

confidence: 99%

Optimization and sensitivity analyses of a combined cooling, heat and power system for a residential building

2021

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In the quest for a better use of energy resources, energy integration and cogeneration strategies have been employed in the industrial and commercial sectors with considerable benefits realized. However, the residential sector remains underexplored. An optimization procedure should be carried out whenever there is a need to ensure or verify the economic viability of an energy system. This study uses Mixed Integer Linear Programming to optimize the energy supply to a residential building, with 20 floors and 40 apartments, located in the city of Jo?o Pessoa (Northeast Brazil). The equipment available includes gas engines, electric and natural gas boilers, heat exchangers, cooling towers, and absorption and mechanical chillers. The optimization establishes the optimal system configuration and operational strategy (operation throughout the year). Economic, technical, and legal aspects were considered in the minimization of the total annual costs associated with the building?s energy supply. The energy demands were calculated on an hourly basis, throughout one year, by the EnergyPlus software and corresponded to hot water (83 MWh/year), electricity (171 MWh/year) and cooling (242 MWh/year) demands. The optimal system was entirely reliant on the electric grid to meet the electricity demand directly and to satisfy heating and cooling demands by means of an electric hot water boiler and a mechanical chiller. The optimal solution is tested by varying, within reasonable limits, selected parameters: natural gas and electricity tariffs, the behavior of residents, amortization factor and relationship between the tariffs of electricity and natural gas.

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Section: Introductionmentioning

confidence: 99%

Optimization and sensitivity analyses of a combined cooling, heat and power system for a residential building

2021

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“…The majority of publications associated with photovoltaicbased energy systems refer to panel-based systems [3][4][5][6][7][8]. However, Jonhston [9] already mentioned in 2007 that if the system is integrated at an early design stage, it could entail in less costs and be more appealing.…”

Section: Introductionmentioning

confidence: 99%

Carbon footprint associated with a mono‐Si cell photovoltaic ceramic roof tile system

Carvalho

Menezes

Gomes

et al. 2019

Env Prog and Sustain Energy

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Photovoltaic roof tiles are aesthetic ceramic roof tiles with integrated photovoltaic solar panels, which could present economic, energy‐related or environmental characteristics that hinder their implementation. The objective of this study is to calculate the carbon footprint associated with a residential electricity supply system based on photovoltaic roof tiles, and compare with a photovoltaic panel‐based system. The Life Cycle Assessment (LCA) methodology was applied to quantify the carbon footprint using the SimaPro 8.4.0.0 software, Ecoinvent database, and IPCC 2013 GWP 100y environmental impact assessment method. Considering the design of a 0.52 kWp system, 1160 kg of CO2‐eq was emitted when photovoltaic mono‐Si roof tiles were installed, compared to 950 kg CO2‐eq for a traditional photovoltaic panel system. A sensitivity analysis verified that utilization of poly‐Si yielded a carbon footprint of 822 kg CO2‐eq but its inherent lower space‐efficiency was an issue, as a larger surface is required (which is not possible with roof tiles, rendering this option not viable). Despite the slightly unfavorable results presented herein, other strategies could be adopted to further reduce the overall carbon footprint of the building, as the use of photovoltaic roof tiles is better accepted from an architectural perspective as it harmonizes with the surroundings. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13120, 2019

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“…There is a constant search for better ways to utilize energy resources and manage costs [14][15][16][17][18][19][20][21][22][23]. Energy systems (sets of subsystems or processes) consume external resources by interacting with the environment to transform them into products.…”

Section: Introductionmentioning

confidence: 99%

Adaptation of the ascendency theory to industrial systems

Carvalho

Serra

2019

J Braz. Soc. Mech. Sci. Eng.

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Growth and development of ecosystems are subject to restrictions. Besides exergy, other properties, such as ascendency, have been described as goal functions that can inform about the health of ecosystems and synthesize information about the energy and matter flows in relation to an ideal theoretical state. Ascendency is an index that quantifies both the growth and the degree of organization in an ecosystem, in which several subsystems interact with mass and energy flows. Ascendency is quantified in terms of mass and energy exchanges among different subsystems constituting an ecosystem. Its value increases when the activity of the ecosystem increases (amount of mass and energy exchanges increase) and when the ecosystem evolves to a higher complexity of its structure (level of integration of the subsystems). Exergy provides information about the quality of energy and is therefore very appropriate for evaluating the thermodynamic efficiency of energy conversion processes. Growing concerns about energy efficiency have stimulated the development of techniques for the analysis, design, and diagnosis of complex energy systems based on the second law of thermodynamics. In this context, the set of methodologies called thermoeconomics was created, aimed at cost allocation (economic, thermodynamic, or environmental) and optimization of thermal systems based on thermodynamic concepts of system operation, which very often use exergy. Thermoeconomic analysis provides information on the interaction among the different components of energy systems and how energy resources are distributed throughout the internal mass and energy flows of the system. Herein the formulation of ascendency was adapted to industrial systems using exergy flows as the quantity of interest, employing the productive structure obtained from thermoeconomic analysis techniques to describe the production process of the system. Ascendency was then applied to a set of simple thermodynamic power systems based on the Rankine cycle to study the connection between energy (thermodynamic) efficiency and the "growth" and "development" of the power system. Four configurations with different interconnection levels between the equipment were studied, maintaining the final product of the power systems (net power) and the energy efficiency of the entire cycle constant, for comparison purposes. Moreover, different turbine efficiencies were also analyzed, maintaining a fixed system structure and constant net power produced, to obtain comparable results. It was verified that in the case of steam power plants based on the Rankine cycle, an increase in system complexity, maintaining the total plant production constant, increases ascendency as well as its potential for energy efficiency improvement. When different cases with the same interconnection level between equipment (same system structure), same net power production and different efficiencies are compared, the configuration with the highest ascendency value also presents a better potential for optimization.

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Photovoltaic solar energy in the economic optimisation of energy supply and conversion

Cited by 20 publications

References 27 publications

Optimization and sensitivity analyses of a combined cooling, heat and power system for a residential building

Optimization and sensitivity analyses of a combined cooling, heat and power system for a residential building

Carbon footprint associated with a mono‐Si cell photovoltaic ceramic roof tile system

Adaptation of the ascendency theory to industrial systems

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