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The SPAB Research Report 3: The SPAB Hygrothermal Modelling

Front cover for The SPAB Research Report 3: The SPAB Hygrothermal Modelling Interim Report

Interim Report

By Dan Browne

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This report forms part of the SPAB's Building Performance Survey, a research project supported by English Heritage, that looks at the performance of a number of traditional buildings both before and after refurbishment designed to improve energy efficiency. This report concentrates on one of the case study houses from that survey, located in Shrewsbury.

Following a review of the British Standards the report presents findings from a study using BS 15026 advanced condensation risk analysis software. The advanced hygrothermal simulation of the case study house, both pre-refurbishment and post-refurbishment raises various issues and has serious consequences, especially for the Green Deal.

Methods for improving accuracy in modelling thermal upgrades are presented along with further research needed and other recommendations for the building industry.

Contents

1. INTRODUCTION
2. U-VALUE AND CONDENSATION RISK ANALYSIS TOOLS IN THE
BUILDING INDUSTRY
3. ENERGY EFFICIENCY AND TRADITIONAL BUILDINGS
4. CONDENSATION RISK ANALYSIS WITHIN THE BRITISH,
EUROPEAN AND INTERNATIONAL STANDARDS
BS 5250:2011 Code of practice for control of condensation in buildings.
BS EN ISO 13788:2002 Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods.
BS EN 15026:2007 Hygrothermal performance of building components and building elements - Assessment of moisture transfer by numerical simulation.
5. WUFI Pro 5.1 ONE-DIMENSIONAL HYGROTHERMAL
SIMULATION SOFTWARE
Hygrothermal Material Properties
Measurement of Material Properties
Climate Data
Thermal Transmittance (U-Value) and Calculation Standards
6. CASE STUDY - ABBEYFOREGATE, SHREWSBURY
Energy Efficiency Measures
Overview of the Study
One-dimensional Representation of the Walls with and without IWI
Establishing Material Inputs
Brick
Mortar Sensitivity Analysis
Brick Sensitivity Analysis
U-values
Climatic Variables
Results of climate sensitivity analyses
Water Content
Relative Humidity
7. DISCUSSION
General overview
Application to the Wider Context
Material Testing
Climatic Variables
Comparison with in situ Results
8. CONCLUSIONS
General
Case Study Conclusions
9. RECOMMENDATIONS AND FURTHER RESEARCH
Immediate Recommendations
WUFI
Standardised Approaches to Simulating Traditional Buildings
Communication
Material Testing and Public Material Database
Liability
In Situ Monitoring
APPENDIX A
Water content of IWI study, calculation summary
APPENDIX B
Climatic variables, calculation summary
APPENDIX C
BS 8104:1992 wind-driven rain calculation
REFERENCES

Additional Information

  • Publication Status: Completed
 
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