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Produkte Buch Validation of hygrothermal material modelling under consideration of the hysteresis of moisture storage

Validation of hygrothermal material modelling under consideration of the hysteresis of moisture storage (E-Book)

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Details zum Buch

Gregor A. Scheffler
Bibliografische Angaben

236 Seiten, zahlr. Abb., Tab., Diagramme


Fraunhofer IRB Verlag

ISBN 9783816796497

The achievable accuracy of hygrothermal building component simulation is significantly dependent on the applied material functions. These functions are determined by the material modelling marking the connection between the basic storage and transport parameters which are obtained from basic measurements, and the storage and transport coefficients which are defined within the balance and flow equations. It is the aim of the present study to develop a flexible and widely applicable material model which is not restricted to the current level of the transport theory. Furthermore, limits and options of this model are to be validated by means of four building materials on the basis of special transient moisture profile measurements.
By the presented study, the material modelling has been decisively further developed, the set of basic measurement methods has been extended by a substantial experiment and the instantaneous profile measurement technique has been made applicable to Building Physics. Moreover, the influences of the process history and the process dynamics on the moisture transport and the resulting moisture profiles could be shown and proven. By that, not only a material model is now available which perfectly applies to the requirements of flexibility, applicability and extendibility. The obtained data provides also a powerful basis for further research and development.

Preface and Acknowledgement



Table of Contents

1 Introduction and Overview

2 Theory of material modelling

2.1 Heat and mass transport in porous media

2.1.1 Transport processes

2.1.2 Balance equations of heat, air and moisture

2.1.3 Constitutive equations for heat, air and moisture

2.1.4 Remarks on heat, air and moisture transport

2.2 Material Modelling in Building Physics

2.2.1 Diffusivity approaches

2.2.2 Conductivity approaches

2.3 Conclusions on material modelling

3 Experimental Methods

3.1 Basic hygrothermal material properties

3.1.1 Density and porosity

3.1.2 Thermal properties

3.1.3 Moisture storage

3.1.4 Vapour diffusion

3.1.5 Water uptake experiment

3.1.6 Drying experiment

3.1.7 Saturated and unsaturated flow experiments

3.1.8 Concluding basic experimental methods

3.2 Instantaneous profile measurements

3.2.1 Principle of instantaneous profile methods

3.2.2 Sensor technology

3.2.3 Concluding instantaneous profile measurements

3.3 Conclusions on Experimental Methods

4 Investigated Material

5 Development and Utilisation

5.1 Developments in Material Modelling

5.1.1 Moisture storage and pore structure

5.1.2 Liquid water and water vapour transport

5.1.3 Heat conduction

5.1.4 Concluding the developments in material modelling

5.2 Methodological Developments for the Drying Experiment

5.2.1 Basics of the drying process.

5.2.2 Drying apparatus – Concept and design

5.2.3 Derivation of a drying coefficient

5.2.4 Conclusions on the drying experiment

5.3 Instantaneous profile measurements

5.3.1 Measurement set-up for the hygroscopic moisture range

5.3.2 Measurement set-up for the overhygroscopic moisture range

5.3.3 TDR calibration and data evaluation

5.3.4 Conclusions on instantaneous profile measurements

5.4 Concluding Developments and Utilisation

6 Implementation and Application

6.1 Implementation of the material model

6.1.1 Program components

6.1.2 Adjustment and calibration procedure

6.2 Application of the material model

6.2.1 Building brick

6.2.2 Calcium silicate

6.2.3 Aerated concrete

6.2.4 Lime-sand brick

6.3 Implementation of TDR data evaluation

6.4 Application of the TDR models

6.5 Conclusions

7 Simulation and Validation

7.1 Hygroscopic moisture transport

7.1.1 Transient moisture storage data

7.1.2 Hygroscopic simulation results

7.1.3 Concluding hygroscopic assessment

7.2 Overhygroscopic moisture transport

7.3 Discussion and Conclusions

7.3.1 Observation summary

7.3.2 Discussion

7.3.3 Concluding assessment

8 Summary, Conclusions and Future Prospects

8.1 Content summary

8.2 Results and conclusions

8.3 Future prospects

List of Symbols and Abbreviations


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