Towards a more reliable characterisation of wind-driven rain spells: Analysis of actual drying intervals in the region of Murcia (Spain)

Authors

Javier Domínguez-Hernández¹ , José M. Pérez-Bella¹ , Rafael Tobajas-Alonso¹ , Alberto Ayensa-Pardos² , Lucas Sanso-Navarro¹

1. Department of Construction Engineering, Engineering and Architecture School, University of Zaragoza,
2. San Jorge University Foundation, Villanueva de Gállego, Spain

Conference / event

2nd International Conference on Moisture in Buildings (ICMB23), July 2023 (London, United Kingdom)

Poster summary

ISO standard 15927-3 allows to identify temporary exposures of wind-driven rain (WDR) on building façades by considering continued wetting intervals (named ‘spells’), separated by 96 hours or more without WDR. These 96 h are supposed presumably sufficient for evaporative losses to exceed prior rainwater ingress in façades but this assumption omits evaporation reliance on multiple local factors. Thus, it seems reasonable that the façades will take less than 96 h to dry in warmer and drier climates than the U.K., which would require to characterise WDR spells separated by shorter drying intervals. In this work, the potential evaporation losses in vertical façades with varied orientations are estimated, thus presenting a realistic estimate of the drying intervals, WDR spells and resultant temporary WDR exposures to be considered in the Region of Murcia (Spain).

Keywords

Wind-driven rain, ISO 15927-3, Method reliability, Potential evaporation, Façade design, Watertightness

Research areas

Meteorology and Atmospheric Sciences, Architecture, Design and Urban Planning, Civil Engineering

References

1. European Committee for Standardization. (2009). EN ISO 15927-3. Hygrothermal performance of buildings. Calculation and presentation of climatic data. Part 3: Calculation of a driving rain index for vertical surfaces from hourly wind and rain data. Brussels
2. Shuttleworth, W.J., Evaporation (chapter 4), in: D.R. Maidment (Ed.), Handbook of Hydrology, McGraw-Hill Inc, New York, 1993, pp. 4.1-4.53
3. Allen, R.G., Pereira, L.S., Raes, D., Smith, M. Crop evapotranspiration (guidelines for computing crop water requirements) - FAO irrigation and drainage paper No. 56. FAO - Food and Agriculture Organization of the United Nations, Rome, 1998
4. Walter, I.A., Allen, R.G., Elliott, R., Itenfisu, D., Brown, P., Jensen, M.E., Mecham, B., Howell, T.A., Snyder, R., Eching, S., Spofford, T, Hattendorf, M., Martin, D., Cuenca, R.H., Wright, J.L. The ASCE standardized reference evapotranspiration equation, ASCE-EWRI Task Committee Report, 2005
5. American Society of Heating, Refrigerating and Air-Conditioning Engineers. (2008). ASHRAE Standard 160P, Criteria for Moisture Control Design Analysis in Buildings. Atlanta

Funding

1. MCIN/AEI/10.13039/501100011033 and by ERDF A way of making Europe (No. Project PID2021-122203OB-I00)

Supplemental files

No data provided

Additional information

Competing interests

No competing interests were disclosed.

Data availability statement

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

Creative Commons license

Copyright © 2023 Domínguez-Hernández et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.