A carregar...
Publicação
Estudo térmico e medidas de promoção de eficiência energética numa nave oficinal
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 3.31 MB | Adobe PDF |
Autores
Resumo(s)
A adoção de práticas sustentáveis tem vindo a ser um tema crescente nos últimos anos. Num contexto nacional, a utilização racional de energia e o desempenho térmico dos edifícios é especialmente importante, dada a dependência energética que Portugal possui e a pobreza energética do parque habitacional. Esta pobreza estende-se a outras tipologias de edifícios como os industriais, muitas vezes devido à sua idade e práticas construtivas adotadas na época. A nave oficinal em estudo apresenta desafios em termos de conforto térmico e qualidade do ar interior, resultantes das suas características construtivas e da obsolescência dos sistemas de climatização. Foram propostas medidas para o aumento do conforto térmico e qualidade do ar interior tendo em conta a promoção da eficiência energética. Foi elaborada uma caracterização térmica do edifício no seu estado atual que levou a propostas de melhoria ao mesmo, sendo estas analisadas numericamente com recurso ao programa de simulação dinâmica HAP, desenvolvido pela Carrier. As melhorias consistem na aplicação de isolamento na cobertura, na fachada sul e a implementação de vãos envidraçados e portões de acesso que possuem um desempenho térmico superior. Para este efeito foi utilizado o EPS, variando a sua espessura, e vãos envidraçados e portões de acesso com um coeficiente global de transmissão térmica inferior. Foi determinado o caudal de ar novo mínimo necessário e dimensionada uma unidade de tratamento de ar para as duas medidas propostas com o maior impacto térmico para o edifício, assim como uma proposta para os pontos de insuflação, extração e extração localizada para a medida que apresenta o maior impacto térmico. Finalmente, analisou-se o consumo energético da instalação variando o caudal de ar novo a insuflar, contemplando os ventiladores, chiller e a bomba de calor, constatando que o menor consumo para o chiller acontece para 80% de ar novo devido ao free-cooling.
Abstract The adoption of sustainable practices has been a growing theme in recent years. In a national context, the rational use of energy and the thermal performance of buildings is especially important, given Portugal's energy dependence and the energy poverty of its housing stock. This poverty extends to other types of buildings such as industrial buildings, often due to their age and the construction practices adopted at the time. The workshop under study presents challenges in terms of thermal comfort and indoor air quality, resulting from its constructive characteristics and the obsolescence of the air conditioning systems. Measures were proposed to increase thermal comfort and indoor air quality, considering the promotion of energy efficiency. A thermal characterization of the building in its current state was carried out, leading to proposals for improvements, which were analyzed numerically using the dynamic simulation program HAP, developed by Carrier. The improvements consist of applying insulation to the roof and south façade and implementing glazed openings and access gates that have superior thermal performance. For this purpose, EPS was used, varying its thickness, and glazed openings and access gates with a lower overall coefficient of thermal transmission. The minimum outside air flow required was determined and an air handling unit was sized for the two proposed measures with the greatest thermal impact on the building, as well as a proposal for the supply, extraction and localized extraction points for the measure with the greatest thermal impact. Finally, the energy consumption of the installation was analyzed by varying the flow of outside air to be blown in, including the fans, chiller and heat pump, and it was found that the lowest consumption for the chiller occurs at 80% outside air due to free-cooling.
Abstract The adoption of sustainable practices has been a growing theme in recent years. In a national context, the rational use of energy and the thermal performance of buildings is especially important, given Portugal's energy dependence and the energy poverty of its housing stock. This poverty extends to other types of buildings such as industrial buildings, often due to their age and the construction practices adopted at the time. The workshop under study presents challenges in terms of thermal comfort and indoor air quality, resulting from its constructive characteristics and the obsolescence of the air conditioning systems. Measures were proposed to increase thermal comfort and indoor air quality, considering the promotion of energy efficiency. A thermal characterization of the building in its current state was carried out, leading to proposals for improvements, which were analyzed numerically using the dynamic simulation program HAP, developed by Carrier. The improvements consist of applying insulation to the roof and south façade and implementing glazed openings and access gates that have superior thermal performance. For this purpose, EPS was used, varying its thickness, and glazed openings and access gates with a lower overall coefficient of thermal transmission. The minimum outside air flow required was determined and an air handling unit was sized for the two proposed measures with the greatest thermal impact on the building, as well as a proposal for the supply, extraction and localized extraction points for the measure with the greatest thermal impact. Finally, the energy consumption of the installation was analyzed by varying the flow of outside air to be blown in, including the fans, chiller and heat pump, and it was found that the lowest consumption for the chiller occurs at 80% outside air due to free-cooling.
Descrição
Palavras-chave
Estudo térmico Nave oficinal Eficiência energética AVAC Consumo energético Thermal study Workshop Energy efficiency HVAC Energy consumption