EBC Annex 24 Heat, Air and Moisture Transport

Status: Completed (1991-1995)

Operating Agent: Prof H Hens, KU-Leuven Laboratory for Building Physics, Belgium

Email: hugo.hens[at]bwk.kuleuven.be

 

Summary

The objectives of this annex were to model and study the fundamental physical phenomena behind and the consequences of heat, air and moisture transfer through new and retrofitted insulated envelope parts. A special emphasis will be put on the energy quality, depending on air tightness, on the hygric behaviour and on the durability aspects of the construction. The knowledge gained by this analysis was applied to performance formulation and to checking the design and production of new retrofitted parts. It was divided into the following five subtasks:

Subtask 1: Model and Algorithm Development

This task includes improving modelling techniques and testing simplified models for predicting the combined effects of HAM-transport on insulation quality, hygric behaviour and durability.

Subtask 2: Inside and External Environmental Conditions

This task includes selecting environmental parameters and a methodology of handling them and the development of exemplary sets of environmental conditions.

Subtask 3: Material and Layer Properties

This task includes data collecting on thermal hygric and air properties of materials and layers and substantial fresh measuring work, especially on the moisture and air properties.

Subtask 4: Experimental Verification

Experimental verification includes hot box and field tests on HAM- transport in envelope parts and comparing measurement results with model prediction.

Subtask 5: Performances and Practice

This task Includes the translation of HAM-knowledge in correct design and execution of highly insulated new and retrofitted envelope parts.

Participants: Belgium, Canada, Denmark, Germany, Finland, Italy, Netherlands, Sweden, Switzerland, UK

Observers: France, Norway, USA

 

Publications

Technical Synthesis Report on Heat, Air and Moisture Transfer in Highly Insulated Building Envelopes
Hens H
UK, Faber Maunsell Ltd., 2002, 21 pp.
Order Printed Copy £20.00 (Order Code: ANN 24 TSR)  Download (668 kb)

The following reports are summarised in the above Technical Synthesis Report

Modelling - Final Report,Volume 1, Part 1
Hens H
Belgium, KU Leuven, Laboratorium Bouwfysica, Departement Burgerlijke Bouwkunde, 1996, 90 pp
Order Printed Copy £25.00 (Order Code: ANN 24 1996:1)

Modelling (Addendum) - Common Exercises: Summary Reports. Final Report, Volume 1, part 2
Mohamed F A, Ed.
Belgium, KU Leuven, Laboratorium Bouwfysica, Departement Burgerlijke Bouwkunde, 1996, c200 pp
Order Printed Copy £35.00 (Order Code: ANN 24 1996:2)

Environmental Conditions - Final Report, Volume 2
Sanders C
Belgium, KU Leuven, Laboratorium Bouwfysica, Departement Burgerlijke Bouwkunde, 1996, 96 pp
Order Printed Copy £25.00 (Order Code: ANN 24 1996:3)

Material Properties - Final Report, Volume 3
Kumar Kumaran M
Belgium, KU Leuven, Laboratorium Bouwfysica, Departement Burgerlijke Bouwkunde, 1996, 135 pp. Download (24 Mb)

Performances and Practice. The Impact of Heat, Air and Moisture Transport on Energy Demand and Durability
Final Report, Volume 5. Task 5
Hagentoft C-E
Laboratorium Bouwfysica, Department Burgerlijke Bouwkunde, KU Leuven, Belgium, 1998, 56 pp
Order Printed Copy £15.00 (Order Code: ANN 24 1998:1)

Enquiry on HAMCAT Codes (Task 1: Modelling)
Hens H, Janssens A
Belgium, KU Leuven, Laboratorium Bouwfysica, Departement Burgerlijke Bouwkunde, 1992, 23 pp
Download                                                                                                                           

Design Parameters Used to Avoid Interstitial Condensation for a Range of Climates: Task 2: Environmental Conditions
Sanders C H
Belgium, KU Leuven, Laboratorium Bouwfysica, Departement Burgerlijke Bouwkunde, 1992, 30 pp
Download