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Bionda, D (2006) Modelling indoor climate and salt behaviour in historical buildings: A case study. ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Eidgenössische Technische Hochschule ETH .

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Indoor climate is a key factor determining the development of damage inside historical buildings. Processes like salt weathering are largely controlled by the temperature and the relative humidity of the environment. In the present work hygrothermal simulations of the indoor climate of a church were performed with a novel hygric model used in combination with the HELIOS thermal code. The applicability of these models to a real, historical building was to be tested. The combination of HELIOS with the hygric model proved to be a viable method for hygrothermal simulations in historical buildings, provided that thermal simulations are as accurate as possible. Considerations on the quality of the relevant building parameters required for modelling are provided. The applicability of indoor climate models to historical buildings provides the opportunity to use these tools to perform risk assessment and investigations of the climatic conditions over a period of many years, without having to rely on long-term in situ measurements. The behaviour of hygroscopic salts in relation to indoor climate was investigated. The principal salt species observed in the study building were mirabilite (Na2SO4-10H2O), thenardite (Na2S04), epsomite (MgS04-7H20), trona (Na3H(C03)2-2H20)and niter (KN03). No other activity in response to climate fluctuations than the phase transition between mirabilite and thenardite was observed. The ECOS thermodynamicmodel, which predicts the behaviour of salt mixtures in relation to climate, was tested by comparing simulation results with the observations of salt species growing on plasters. Results are presented for plasters on which efflorescences of mirabilite, thenardite and epsomite were detected. Saturation indexes for the relevant soluble salt species in the pore solutions were calculated. A correlation between efflorescences on the plasters and calculated saturation indexes has been observed.

Item Type: Thesis (["eprint_fieldopt_thesis_type_phd" not defined])
Uncontrolled Keywords: Salt; Monitoring; Church; Modelling; Simulation; Indoor climate
Subjects: ?? Salt ??
?? case ??
English > Damage functions > Salt damage
?? monitor ??
Depositing User: Anna Samuelsson
Date Deposited: 10 Jun 2008 07:54
Last Modified: 04 Apr 2017 12:59

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