Drainage and Evaporation from Window Sill Trays
Bassett, M., Mcneil, S., Bennett, J.
2009
Journal of Building Physics, Vol. 32, No. 4, 319-333
windows ? sill tray ? ventilated cavity ? tracer techniques ? water management.
Bassett, M., Mcneil, S., Bennett, J., (2009), "Drainage and Evaporation from Window Sill Trays", Journal of Building Physics, Vol. 32, No. 4, 319-333.
| Abstract: |
| Flat sill trays can be attractive where trim cavity depths are too narrow for a sloped sill tray, but their effectiveness in managing water leaks is sometimes questioned. This research contributes to the debate on sloped versus flat trays in windows used in temperate New Zealand. Ventilation rates are measured in each trim cavity with a constant and uniform emission tracer method and are found to fall in the range 0.04¡ª0.13 L/s. Equivalent ventilation rates calculated using a duct flow model and local climate data were in the same range (0.09¡ª0.13 L/s) and this allows the model to be used to estimate ventilation rates and consequential evaporation over a longer period. During artificial irrigation with water, the sloped trays are found to drain effectively but the flat trays only intermittently drain to outside. The evaporated loss from the two sloped sill trays (30 and 41 g/day) is comparable to calculated evaporation rate for the period, but both flat sill trays lose water into the framing below the windows due to installation faults. |
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This publication in whole or part may be found online at:  here. |
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