Publicação
Renovation of a residential building for its certification as a nZEB
| Resumo: | In the European Union, 40% of the final energy consumption is used for heating and cooling buildings, which also accounts for 36% of CO2 emissions. Due to this high energy consumption, there has been given emphasis on reducing this consumption by constructing buildings whose energy needs are as low as possible, i.e., nZEB. However, reducing energy consumption is not only possible by constructing more efficient buildings. Much of the building stock in the European Union is old, so there has been a strong focus on renovating buildings. The aim of this work is therefore to analyze a traditional Portuguese residential building, assess its energy costs for air conditioning and analyze thermal comfort. Then apply improvement measures and carry out the same analysis. Two methods were used for this analysis: the seasonal method, which is currently used for energy certification of residential buildings in Portugal, and dynamic simulation, which, according to the text approved on 14th of March 2023 by the European Parliament, regarding the recast of the directive on the energy performance of buildings, will become mandatory. The seasonal method assumes a quasi-steady state, heat transfer occurs in a permanent regime, with external and internal temperatures remaining constant. Although this method allows buildings to be compared, which is its main use, it is inadequate when it comes to accurately determining a building's energy needs. In addition, the seasonal methodology does not allow for the determination of comfort, indoor conditions are constant, and the method does not allow for the calculation of parameters that influence comfort. Using a dynamic simulation program such as EnergyPlus has made it possible to determine energy needs more accurately due to its ability to detail diverse parameters over time. In addition, the ability to determine factors such as the temperature and relative humidity of spaces, surface temperature, among others, makes it possible to predict thermal comfort in the home. In this way, the renovation measures applied to the building have improved comfort conditions in the home, especially in summer, and reduced heating needs by 83% and cooling needs by 87%. |
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| Autores principais: | Gonçalves, Pedro Miguel Costa |
| Assunto: | Dynamic simulation Energy performance Thermal comfort nZEB Simulação dinâmica Desempenho energético Conforto térmico |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | In the European Union, 40% of the final energy consumption is used for heating and cooling buildings, which also accounts for 36% of CO2 emissions. Due to this high energy consumption, there has been given emphasis on reducing this consumption by constructing buildings whose energy needs are as low as possible, i.e., nZEB. However, reducing energy consumption is not only possible by constructing more efficient buildings. Much of the building stock in the European Union is old, so there has been a strong focus on renovating buildings. The aim of this work is therefore to analyze a traditional Portuguese residential building, assess its energy costs for air conditioning and analyze thermal comfort. Then apply improvement measures and carry out the same analysis. Two methods were used for this analysis: the seasonal method, which is currently used for energy certification of residential buildings in Portugal, and dynamic simulation, which, according to the text approved on 14th of March 2023 by the European Parliament, regarding the recast of the directive on the energy performance of buildings, will become mandatory. The seasonal method assumes a quasi-steady state, heat transfer occurs in a permanent regime, with external and internal temperatures remaining constant. Although this method allows buildings to be compared, which is its main use, it is inadequate when it comes to accurately determining a building's energy needs. In addition, the seasonal methodology does not allow for the determination of comfort, indoor conditions are constant, and the method does not allow for the calculation of parameters that influence comfort. Using a dynamic simulation program such as EnergyPlus has made it possible to determine energy needs more accurately due to its ability to detail diverse parameters over time. In addition, the ability to determine factors such as the temperature and relative humidity of spaces, surface temperature, among others, makes it possible to predict thermal comfort in the home. In this way, the renovation measures applied to the building have improved comfort conditions in the home, especially in summer, and reduced heating needs by 83% and cooling needs by 87%. |
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