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Category: Gilberts Weather Louvres High Performance Louvres
Gilberts (Blackpool) Ltd High Performance Weather Louvre Selection - WH SeriesTable 1In order to effectively size a high performance louvre one must
firstly establish the parameters that are important to the system
design. These may be:- EXAMPLE 1If the maximum pressure drop that can be accommodated is 16 Pa, then
the ventilation rate per m² of louvre area that can be handled from
Table 1 would be 1.5m³/s. EXAMPLE 2If the effectiveness or water repellent nature of the louvre is paramount and a 99% efficiency is important, then from Table 2 a 1m/s face velocity or 1m³/s per square metre of louvre area would be the maximum volume that can be accommodated. This would then give a pressure drop from Table 1 of 7.5 Pa. CLASSIFICATIONFrom the New European Standard EN 13030, louvres will be classified
using both the COEFFICIENT OF ENTRY or DISCHARGE (CE or CD) and a water
penetration rate. EXAMPLE LOUVRE SIZING Required louvre with an effectiveness of no less than 0.99 and a maximum pressure drop of 16 Pa. TOTAL INTAKE VOLUME 5M³/S From Table 2 maximum ventilation rate per m² of louvre area that will
give 0.99 effectiveness = 1m³/s. ALTERNATIVE If an effectiveness of 0.98 would suffice, then from Table 2 a volume
of 1.5m³/s per m² face area would be allowed. PENTHOUSE LOUVRESFor Penthouse louvres the face area of all sides should be calculated and the addition related to the above calculations for total face area. TEST RESULTSAll Gilberts louvres have been subject to simulated weather
conditions on the BSRIA Test Rig, which follows the requirements and
specification of the new European Standard EN13030. All graphs and
information are developed from test results.
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