Cit:Uno.etal:2021
| Autor | Uno, T.; Abuku, M.; Iba, C. |
| Jahr | 2021 |
| Titel | Environmental factors for salt weathering of modern Japanese brick chimney |
| Bibtex | @inproceedings { Uno.etal:2021,
title = {Environmental factors for salt weathering of modern Japanese brick chimney }, booktitle = {Proceedings of SWBSS 2021 – Fifth International Conference on Salt Weathering of Buildings and Stone Sculptures}, year = {2021}, editor = {Lubelli, B.; Kamat, A.A.; Quist, W.J.}, pages = {41-48}, publisher = {TU Delft Open}, note = {In this study, we investigated the factors affecting the salt weathering of a brick chimney in a historical building used as a Japanese s ake brewery.The mapping of the weathered areas, field measurements of the thermal environment and computational fluid dynamics (CFD) analysis of the airflow and temperature in the brick chimney flue were conducted. The salt observed on the chimney was determined to be sodium sulfate(Na2SO4). The exhaust gas of the boiler was the major source of water and sodium sulfate. The water vapour in the hot exhaust gas with salts would condense on the cold surface inside the chimney flue, resulting in salt solution penetration into the brick; subsequently, water evaporation at the outside surface would lead to salt crystallisation. Our field observation showed that salt crystallisation was concentrated at 1 m above the floor but did not occur above 2 m, at the level where an exhaust pipe of the boiler gas was connected to the brick chimney. According to the surface temperature measurement results, the temperature increase at non-weathered areas was larger than that at weathered areas. The CFD analysis showed that warmer air moved upwards above the exhaust duct, whereas colder air remained stagnant below the exhaust duct. This result suggested that both the airflow and the corresponding temperature distribution in the brick chimney flue influenced the spatial distribution pattern of salt weathering.}, key = {SWBSS 2021}, url = {https://predict.kikirpa.be/wp-content/uploads/2021/12/SWBSS2021_Procedings.pdf }, fulltext = {File:Tomoko-etal 2021 1.pdf}, author = {Uno, T. and Abuku, M. and Iba, C.} } |
| DOI | |
| Link | |
| Bemerkungen | in: Lubelli, B.; Kamat, A.A.; Quist, W.J. (Hrsg.): Proceedings of SWBSS 2021 – Fifth International Conference on Salt Weathering of Buildings and Stone Sculptures,TU Delft Open 41-48 |
Eintrag in der Bibliographie
| [Uno.etal:2021] | Uno, T.; Abuku, M.; Iba, C. (2021): Environmental factors for salt weathering of modern Japanese brick chimney . In: Lubelli, B.; Kamat, A.A.; Quist, W.J. (Hrsg.): Proceedings of SWBSS 2021 – Fifth International Conference on Salt Weathering of Buildings and Stone Sculptures,TU Delft Open 41-48, Webadresse. |   |
Keywords[Bearbeiten]
Field survey, environmental measurement, computational fluid dynamics (CFD) analysis
Abstract[Bearbeiten]
In this study, we investigated the factors affecting the salt weathering of a brick chimney in a historical building used as a Japanese s ake brewery.The mapping of the weathered areas, field measurements of the thermal environment and computational fluid dynamics (CFD) analysis of the airflow and temperature in the brick chimney flue were conducted. The salt observed on the chimney was determined to be sodium sulfate(Na2SO4). The exhaust gas of the boiler was the major source of water and sodium sulfate. The water vapour in the hot exhaust gas with salts would condense on the cold surface inside the chimney flue, resulting in salt solution penetration into the brick; subsequently, water evaporation at the outside surface would lead to salt crystallisation. Our field observation showed that salt crystallisation was concentrated at 1 m above the floor but did not occur above 2 m, at the level where an exhaust pipe of the boiler gas was connected to the brick chimney. According to the surface temperature measurement results, the temperature increase at non-weathered areas was larger than that at weathered areas. The CFD analysis showed that warmer air moved upwards above the exhaust duct, whereas colder air remained stagnant below the exhaust duct. This result suggested that both the airflow and the corresponding temperature distribution in the brick chimney flue influenced the spatial distribution pattern of salt weathering.