Numerical and experimental study on metamaterials featuring acoustical and thermal properties
| Autor: | Edoardo Alessio Piana, Mariagrazia Pilotelli, Manuela Neri, Adriano Maria Lezzi, Elisa Levi |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
acoustic optimization
sound transmission loss History four microphone impedance tube Materials science comfort conditions thermal transmittance Acoustics sound absorption Metamaterial Computer Science Applications Education metamaterials Thermal metamaterials comfort conditions acoustic optimization four microphone impedance tube sound absorption sound transmission loss thermal optimization thermal transmittance transfer matrix transfer matrix thermal optimization |
| Popis: | Metamaterials can be defined as materials which, for their peculiar composition or structure, exhibit characteristics that are not normally found in nature. “Multifunctional” metamaterials could be used to optimise different characteristics at the same time. In this paper the authors try to apply them for thermal and acoustic optimization of external building walls. Thermal optimization consists in obtaining a low transmittance, important in winter, and a low periodic thermal transmittance, important in summer. Acoustic optimization consists in obtaining high sound transmission loss, to respect the law prescriptions, and a good sound absorption coefficient, if possible. In this way should be possible enhance the comfort conditions in buildings and reduce the energy demand for winter heating and summer cooling. The proposed solution consists of several layers with different suitable characteristics: the sequence of the layers has been chosen with particular care. The thermal analysis has been performed by means of a self-developed code based on the ISO 13786 standard. The acoustic behaviour of the single layers has been determined following the procedure given by the ASTM E2611-09 standard using a four-microphone impedance tube and the transfer matrix method has been used for the complete assembly. This preliminary combined study showed encouraging results. |
| Databáze: | OpenAIRE |
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