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C. Harreither, N. Morishita-Steffen, T. Bednar:
"Prediction of indoor climate based on questionnaires";
Talk: 10th Nordic Symposium on Building Physics, Lund, Sweden; 2014-06-15 - 2014-06-19; in: "NSB", Grafisk gruppen AB, (2014), ISBN: 978-91-88722-53-9; Paper ID 171, 8 pages.

The main goal of our study was the validation of a formerly presented model to calculate the indoor humidity. Indoor humidity is the most important boundary condition for the hygrothermal behaviour of building components. With the presented model, the durability and life-cycle costs of building components can be predicted. The presented work forms the basis for decision making during the
design process.
In this study, questionnaires from 38 households were collected regarding indoor moisture production and ventilation behaviour. The questionnaire answers and values from literature were used as inputs
in the formerly presented model. Temperature, relative humidity, and air tightness measurements were performed in parallel. The outcome was compared to the calculation results and used to validate and
refine the model.
The calculated results fit well to the measured values, if the humidity is in the low to average range. When absolute indoor humidity is very high, the calculation shows variance from the measured values. The calculated maximum is 15 g/m³, which exceeds the measured maximum of 11 g/m³. Theories for the variance have been postulated; however, specific questions for airtight buildings
should be included in future questionnaires to determine the reasons for the variance.
The work forms part of the Austrian contribution to IEA Annex 55.

indoor climate, relative humidity, indoor temperature, air tightness, questionnaire