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Publikācija: Study of Hygrothermal Processes in External Walls with Internal Insulation

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity State funding for education
Defending: ,
Publication language English (en)
Title in original language Study of Hygrothermal Processes in External Walls with Internal Insulation
Field of research 2. Engineering and technology
Sub-field of research 2.7 Environmental engineering and energetics
Authors Edīte Biseniece
Ritvars Freimanis
Reinis Purviņš
Armands Grāvelsiņš
Aivars Pumpurs
Andra Blumberga
Keywords Energy efficiency in buildings; historic buildings; internal insulation; mold growth
Abstract 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.
DOI: 10.1515/rtuect-2018-0002
Reference Biseniece, E., Freimanis, R., Purviņš, R., Grāvelsiņš, A., Pumpurs, A., Blumberga, A. Study of Hygrothermal Processes in External Walls with Internal Insulation. Environmental and Climate Technologies, 2018, 22, pp.22-41. Available from: doi:10.1515/rtuect-2018-0002
Additional information Citation count:
ID 27997