Study of Hygrothermal Processes in External Walls with Internal Insulation
Being an important contributor to the final energy consumption, historic buildings built before 1945 have high specific heating energy consumption compared to current energy standards and norms. However, they often cannot be insulated from the outside due to their heritage and culture value. Interna...
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Online Access: | https://doi.org/10.1515/rtuect-2018-0002 |
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doaj-05ed2e0880f9423486d41bd8f9fe37ae2021-09-05T14:00:23ZengSciendoEnvironmental and Climate Technologies2255-88372018-03-01221224110.1515/rtuect-2018-0002rtuect-2018-0002Study of Hygrothermal Processes in External Walls with Internal InsulationBiseniece Edite0Freimanis Ritvars1Purvins Reinis2Gravelsins Armands3Pumpurs Aivars4Blumberga Andra5Institute of Energy Systems and Environment, Riga Technical University Azenes iela 12/1, Riga, LV-1048, LatviaInstitute of Energy Systems and Environment, Riga Technical University Azenes iela 12/1, Riga, LV-1048, LatviaInstitute of Energy Systems and Environment, Riga Technical University Azenes iela 12/1, Riga, LV-1048, LatviaInstitute of Energy Systems and Environment, Riga Technical University Azenes iela 12/1, Riga, LV-1048, LatviaInstitute of Industrial Electronics and Electrical Engineering, Riga Technical University, Azenes iela 12/1, Riga, LV-1048, LatviaInstitute of Energy Systems and Environment, Riga Technical University Azenes iela 12/1, Riga, LV-1048, LatviaBeing an important contributor to the final energy consumption, historic buildings built before 1945 have high specific heating energy consumption compared to current energy standards and norms. However, they often cannot be insulated from the outside due to their heritage and culture value. Internal insulation is an alternative. However internal insulation faces challenges related to hygrothermal behaviour leading to mold growth, freezing, deterioration and other risks. The goal of this research is to link hygrothermal simulation results with experimental results for internally insulated historic brick masonry to assess correlation between simulated and measured data as well as the most influential parameters. The study is carried out by both a mathematical simulation tool and laboratory tests of historic masonry with internal insulation with four insulation materials (mineral wool, EPS, wood fiber and granulated aerogel) in a cold climate (average 4000 heating degree days). We found disparity between measured and simulated hygrothermal performance of studied constructions due to differences in material parameters and initial conditions of materials. The latter plays a more important role than material parameters. Under a steady state of conditions, the condensate tolerating system varies between 72.7 % and 80.5 % relative humidity, but in condensate limiting systems relative humidity variates between 73.3 % and 82.3 %. The temperature between the masonry wall and all insulation materials has stabilized on average at +10 °C. Mold corresponding to Mold index 3 was discovered on wood fiber mat.https://doi.org/10.1515/rtuect-2018-0002energy efficiency in buildingshistoric buildingsinternal insulationmold growth |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Biseniece Edite Freimanis Ritvars Purvins Reinis Gravelsins Armands Pumpurs Aivars Blumberga Andra |
spellingShingle |
Biseniece Edite Freimanis Ritvars Purvins Reinis Gravelsins Armands Pumpurs Aivars Blumberga Andra Study of Hygrothermal Processes in External Walls with Internal Insulation Environmental and Climate Technologies energy efficiency in buildings historic buildings internal insulation mold growth |
author_facet |
Biseniece Edite Freimanis Ritvars Purvins Reinis Gravelsins Armands Pumpurs Aivars Blumberga Andra |
author_sort |
Biseniece Edite |
title |
Study of Hygrothermal Processes in External Walls with Internal Insulation |
title_short |
Study of Hygrothermal Processes in External Walls with Internal Insulation |
title_full |
Study of Hygrothermal Processes in External Walls with Internal Insulation |
title_fullStr |
Study of Hygrothermal Processes in External Walls with Internal Insulation |
title_full_unstemmed |
Study of Hygrothermal Processes in External Walls with Internal Insulation |
title_sort |
study of hygrothermal processes in external walls with internal insulation |
publisher |
Sciendo |
series |
Environmental and Climate Technologies |
issn |
2255-8837 |
publishDate |
2018-03-01 |
description |
Being an important contributor to the final energy consumption, historic buildings built before 1945 have high specific heating energy consumption compared to current energy standards and norms. However, they often cannot be insulated from the outside due to their heritage and culture value. Internal insulation is an alternative. However internal insulation faces challenges related to hygrothermal behaviour leading to mold growth, freezing, deterioration and other risks. The goal of this research is to link hygrothermal simulation results with experimental results for internally insulated historic brick masonry to assess correlation between simulated and measured data as well as the most influential parameters. The study is carried out by both a mathematical simulation tool and laboratory tests of historic masonry with internal insulation with four insulation materials (mineral wool, EPS, wood fiber and granulated aerogel) in a cold climate (average 4000 heating degree days). We found disparity between measured and simulated hygrothermal performance of studied constructions due to differences in material parameters and initial conditions of materials. The latter plays a more important role than material parameters. Under a steady state of conditions, the condensate tolerating system varies between 72.7 % and 80.5 % relative humidity, but in condensate limiting systems relative humidity variates between 73.3 % and 82.3 %. The temperature between the masonry wall and all insulation materials has stabilized on average at +10 °C. Mold corresponding to Mold index 3 was discovered on wood fiber mat. |
topic |
energy efficiency in buildings historic buildings internal insulation mold growth |
url |
https://doi.org/10.1515/rtuect-2018-0002 |
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