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Advisor(s)
Abstract(s)
A sensibilidade para as energias verdes e renováveis tem vindo a aumentar
exponencialmente e cada vez se procura mais a implementação de instalações que
respeitem, protejam o ambiente e reduzam a emissão de carbono/pegada ecológica. É
neste âmbito que se enquadra este projecto.
As praias do vasto litoral português fornecem inúmeras oportunidades de trabalho e lazer,
muitas vezes associadas a desportos náuticos, onde famílias e desportistas passam o dia.
Com o objectivo de facilitar a comodidade dos utilizadores para guardar os seus valores
e/ ou refrigerar os alimentos e bebidas enquanto disfrutam da praia, este trabalho propõe
a concepção de um espaço verde, de elevada eficiência energética, com capacidade de
refrigeração, alimentado por um sistema de painéis fotovoltaicos, auto-suficiente e com
respeito pelo meio ambiente.
Com a ajuda de softwares dedicados à energia fotovoltaica e ao ciclo frigorífico, foram
dimensionados ambos os sistemas de modo a que conseguissem ser auto-sustentáveis.
Obteve-se uma necessidade de consumo eléctrico de 5076,8 W e uma capacidade de
produção de 5440 W, o que permitem concluir que todo o circuito é auto-sustentável.
Fez-se o estudo de viabilidade económica do modelo de negócio do projecto, utilizando
indicadores financeiro. Foi feito um breve estudo de mercado relativamente aos preços
de cacifos, no entanto, foi necessário prever alguns valores, como por exemplo, o número
de horas de abertura da instalação para os utentes, a percentagem de cacifos em utilização,
etc. Com as premissas anteriores já definidas, e através dos indicadores económicos
conhecidos, chegou-se a valores muito positivos a nível de viabilidade económica.
Obteve-se um período de recuperação de capital de cerca de 1,44 anos, um valor actual
líquido a uma taxa de 8,51 % de 198 315,47 €, uma taxa interna de rendibilidade de
169,42 % e um índice de rendibilidade de 1,79 %, valores extremamente positivos e
apelativos.
É, portanto, um projecto exequível, quer a nível técnico, quer a nível económico.
Com os resultados obtidos, foi desenvolvido um pedido de modelo de utilidade para
salvaguardar este novo serviço que justa duas tecnologias já existentes.
Public awareness of the sources of energy leads to encouraging green and renewable energy as an option to protect the environment and reduce carbon footprint. This is the scope of this project. The vast Portuguese coastline provides countless work and leisure opportunities, often associated with water sports, where families and sportsmen spend the day at the beach. With the aim of easing the convenience of its users to store their valuables and/or refrigerate their food and drinks while at sea or on the beach, this work proposes the projection of a green space, with high energy efficiency and the capacity of a cooling system powered by a photovoltaic system that allows self-sufficiency and respects the environment. With the help of dedicated photovoltaic and refrigeration cycle softwares, both systems were scaled so that they could be self-sustaining, which was verified and confirmed after their sizing with a consumption of 5076,8 W and a production capacity of 5440 W. To understand the level of this project as if it is a good investment, a bench marketing study was done regarding the prices of lockers and it was necessary to foresee some values, such as the number of opening hours of the facility for users, the percentage of lockers in use, etc. With the previous assumptions already defined, and through the known economic indicators, very interesting values were reached in terms of economic viability. Values like 1,44 years of payback period, 198 315,47 € of net present value with a 8,51 % tax, 169,42 % of internal rate of return and 1,79 % of profitability index, are all proof that the investment is highly recommended. Through the combination of two pilot schemes, photovoltaic and refrigeration, the project achieves energy self-sustainability and economic viability in the short term. With the results achieved, a utility model request was made to save and protect this new idea of service that gathers two already known technologies such as photovoltaic energy and the refrigeration cycle.
Public awareness of the sources of energy leads to encouraging green and renewable energy as an option to protect the environment and reduce carbon footprint. This is the scope of this project. The vast Portuguese coastline provides countless work and leisure opportunities, often associated with water sports, where families and sportsmen spend the day at the beach. With the aim of easing the convenience of its users to store their valuables and/or refrigerate their food and drinks while at sea or on the beach, this work proposes the projection of a green space, with high energy efficiency and the capacity of a cooling system powered by a photovoltaic system that allows self-sufficiency and respects the environment. With the help of dedicated photovoltaic and refrigeration cycle softwares, both systems were scaled so that they could be self-sustaining, which was verified and confirmed after their sizing with a consumption of 5076,8 W and a production capacity of 5440 W. To understand the level of this project as if it is a good investment, a bench marketing study was done regarding the prices of lockers and it was necessary to foresee some values, such as the number of opening hours of the facility for users, the percentage of lockers in use, etc. With the previous assumptions already defined, and through the known economic indicators, very interesting values were reached in terms of economic viability. Values like 1,44 years of payback period, 198 315,47 € of net present value with a 8,51 % tax, 169,42 % of internal rate of return and 1,79 % of profitability index, are all proof that the investment is highly recommended. Through the combination of two pilot schemes, photovoltaic and refrigeration, the project achieves energy self-sustainability and economic viability in the short term. With the results achieved, a utility model request was made to save and protect this new idea of service that gathers two already known technologies such as photovoltaic energy and the refrigeration cycle.
Description
Trabalho final de mestrado para obtenção do grau de mestre em Engenharia Mecânica
Keywords
Sistema fotovoltaico Photovoltaic system Ciclo frigorífico Refrigeration cycle Sistema inovador Innovative system Energia renovável Renewable Energy Sustentabilidade Sustainability Viabilidade económica Economic viability
Citation
CALHA, António Monteiro Higss Miranda - COOLSPOT : auto-suficiência e viabilidade económica. Lisboa: Instituto Superior de Engenharia de Lisboa, 2019. Dissertação de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa