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Abstract(s)
A atual situação económica com que nos deparamos e a consciencialização do problema de sustentabilidade ambiental, leva a que sejam, que cada vez mais, investigadas estratégias e soluções de baixo custo através de modelos computacionais, que permitam avaliar e melhorar a eficiência energética nos edifícios.
Assim, a presente dissertação tem como propósito avaliar o desempenho energético de armazém refrigerado, dedicado à distribuição de produtos alimentares, cujo consumo energético total seja maioritariamente apresentado pelos sistemas de refrigeração através da ferramenta computacional – Design Builder/Energy Plus.
Para se conseguir essa avaliação, foi construído um modelo computacional do edifício, no qual foi introduzida toda a informação recolhida nas visitas realizadas à empresa, a fim de se obter uma caracterização completa relativamente à sua localização, orientação, temperaturas de conservação dos produtos, tipo de materiais utilizados na construção, tipos de equipamentos elétricos, sistemas de refrigeração, iluminação, entre outros. Dado a importância da descrição destes parâmetros no software e o conhecimento de como estes são tratados pelos diferentes módulos de cálculo, foi realizada uma descrição detalhada da ferramenta como complemento ao trabalho desenvolvido, permitindo a posterior seleção das opções de cálculo consideradas pelo Energy Plus durante a definição do modelo.
Após caracterização do modelo, procedeu-se à sua simulação onde foi analisado o desempenho térmico do edifício nas diferentes zonas e se verificou que os consumos elétricos totais obtidos nas simulações anuais apresentavam uma discrepância comparativamente aos consumos apresentados pelas faturas elétricas do mesmo período homólogo, procedendo-se a uma análise de sensibilidade da influência de algumas variáveis em função do consumo do sistema de refrigeração. Dessas análises conclui-se quais as variáveis que apresentam maior efeito no consumo total de refrigeração e consequentemente do edifício são a temperatura de conservação, os materiais da cobertura e a localização do edifício.
The actual economic situation and the awareness about environmental sustainability problems, promotes the investigation for strategies and low cost solutions, using computational models, which assess and provide energy efficiency in buildings. Thus, the present dissertation aims to assess the energy performance of refrigerated warehouses devoted to foodstuffs storage, which electrical consumption are mostly due to the refrigeration systems. The energy performance assessment is performed using the computational tool – Design Builder/Energy Plus. A computational model of the building was developed, in which it is inserted the data collected in visits to the refrigerated warehouse. The data provided a wholly characterization relatively to its location, orientation, foods conservation temperatures, construction materials types, electrical equipment types, refrigeration systems, lighting and others. Due to importance of the description of these parameters in software and the knowledge how they are treated by different solvers, it was made a detailed description of the tool as complement to developed work, allowing further options selection considered by Energy Plus during the model definition. After model characterization, its simulation allowed analyzing the thermal performance of the building in different zones. It was verified that total electrical consumption obtained in annual simulation shows differences comparatively to electrical invoices in the same homologous period,. This situation allowed the development of sensibility analysis of some variables with influence in refrigeration system consumption. It was concluded that the variables with larger effect in the total refrigeration consumption and, consequently, in building consumptions are the air conservation temperature, the rooftop materials and the building location.
The actual economic situation and the awareness about environmental sustainability problems, promotes the investigation for strategies and low cost solutions, using computational models, which assess and provide energy efficiency in buildings. Thus, the present dissertation aims to assess the energy performance of refrigerated warehouses devoted to foodstuffs storage, which electrical consumption are mostly due to the refrigeration systems. The energy performance assessment is performed using the computational tool – Design Builder/Energy Plus. A computational model of the building was developed, in which it is inserted the data collected in visits to the refrigerated warehouse. The data provided a wholly characterization relatively to its location, orientation, foods conservation temperatures, construction materials types, electrical equipment types, refrigeration systems, lighting and others. Due to importance of the description of these parameters in software and the knowledge how they are treated by different solvers, it was made a detailed description of the tool as complement to developed work, allowing further options selection considered by Energy Plus during the model definition. After model characterization, its simulation allowed analyzing the thermal performance of the building in different zones. It was verified that total electrical consumption obtained in annual simulation shows differences comparatively to electrical invoices in the same homologous period,. This situation allowed the development of sensibility analysis of some variables with influence in refrigeration system consumption. It was concluded that the variables with larger effect in the total refrigeration consumption and, consequently, in building consumptions are the air conservation temperature, the rooftop materials and the building location.
Description
Keywords
Cargas térmicas Eficiência energética Design builder Energy plus