Investigation of coupled vapor and heat transport in hygroscopic material during adsorption and desorption
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Date
2022-04-15
Publication Type
Journal Article
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yes
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Abstract
Vapor sorption in hygroscopic porous materials is accompanied by latent heat release/storage, which can influence indoor thermal comfort and building heating and cooling energy consumption. There is a need to better understand the coupled vapor and heat transport during adsorption and desorption. In this study, longitudinal spruce samples are exposed to adsorption and desorption experiments. Neutron radiography provides accurate measurement of moisture content variations spatially and temporally. Wireless thermocouples provide accurate measurements of temperature at different locations. Large changes in moisture content and temperature are observed during both adsorption and desorption experiments. Both moisture content and temperature variations seen in experiments are well simulated with hygrothermal modeling. The latent heat associated with vapor sorption is found to be the source of the large variations in temperature. It is found that vapor permeability influences both vapor and thermal transport while thermal conductivity influences only thermal transport. The vapor transfer coefficient has a small influence on vapor transport while the convective heat transfer coefficient has an influence on heat transport. The validated hygrothermal model is further used to simulate the coupled vapor and heat transport occurring in moisture buffering tests. It is found that moisture buffering values are different by up to 14% depending on the presence or absence of thermal insulation around the samples. For more hygroscopic materials, the difference can be even much larger. It is recommended not only to seal and but also to insulate samples for moisture buffering tests.
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Publication status
published
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Journal / series
Volume
214
Pages / Article No.
108845
Publisher
Pergamon
Event
Edition / version
Methods
Software
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Date collected
Date created
Subject
Wood; Sorption; Latent heat; Moisture buffering; Thermal insulation; Neutron radiography
Organisational unit
03806 - Carmeliet, Jan / Carmeliet, Jan