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Abolfazl Hayati, Ph.D., University of Gävle
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Magnus Mattsson, Dr.Ing., University of Gävle
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Mats Sandberg, Dr.Ing., Indoor Environment, University of Gävle, Gavle, Sweden
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In churches, intentional airing may be a measure to evacuate temporarily high levels of contaminants that are emitted during services and other occasions. Crucial contaminants include moisture and other emissions that may deteriorate and/or soil surfaces of paintings and other precious artefacts. Most churches do not have any mechanical ventilation system or any purpose provided openings for natural ventilation, but the ventilation is governed by air infiltration. Enhanced airing may be achieved by opening external windows or doors. Thus, models provided in energy simulation programs should predict this kind of air flows correctly, also in order to get a proper estimation of the total energy use. However there might be some limitations for airing in historical ancient buildings regarding moisture transfer, since at some conditions the outdoor air might be too humid. IDA-ICE is examined here and the models for humidity used in the program are investigated. In the present study, field measurements are performed for airing rate and moisture transfer in a historical church and the results are compared with modelled results from IDA-ICE energy simulation program.
