Eurovent introduces efficiency ratings in 2012 for fine-particle filters
05. July 2011 Delbag filters from GEA achieve efficiency Classes A and B
Beginning in 2012, buyers of fine-particle filters will find it simpler, in addition to choosing the correct filter class, to also choose the most cost-effective product. This is because, starting in January, manufacturers will be allowed to signify the efficiency of their fine-particle filters with a Eurovent energy label. Analogously to the energy classes for light sources, Class A stands for the lowest, and Class G for the greatest energy consumption. Delbag fine-particle filters from GEA will be among the first products to bear this efficiency label – and will shine at the same time with a good rating. Delbag Class F7 and F9 filters – used, for example, in office buildings and hospitals – will achieve Class A for efficiency: a guarantee for low operating expense.
Power costs are “stealth” filter costs
In the overall costs for operating a filter system, the purchase price itself plays a secondary role. The big money-gobbler, however, is difficult to determine: the power consumption to overcome the pressure drop. Up to approx. 90 % of filter costs arise from these energy expenses. Even a low initial pressure drop, though, will not always assure low operating costs. This is due to the fact that filter usage will cause the filter media to clog with separated impurities over time – with the resulting drastic increase in air resistance.
Rating results determined under realistic conditions
As a result, Eurovent takes full account of filter usage conditions in reality and tests whether fine-particle filters will also economically operate even after accumulation of separated pollutants. This involves determining the filter pressure drop for a defined filter dust burden. For example, Eurovent conventions require that 100 g of dust be applied to fine-particle filters in Classes F7 to F9 before measurement begins (in case of coarser filters, greater test burdens are stipulated). On the basis of the measured pressure difference, Eurovent calculates power consumption by a fan with 50 % efficiency, if this fan moves 3,400 m³/h of air for a period of 6,000 hours. The annual energy consumption calculated in this way then serves as basis for awarding an efficiency-class rating.
Rating criteria matched to filter classes
Since, as a rule, filter effectiveness can be achieved only with greater pressure drops, classifications are not always uniform. Filters in Class F8, for example, may for the same rating demonstrate a greater pressure drop than do Class F7 filters. Comparison of efficiency ratings therefore makes sense only within the same desired filter-quality group.
Unbiased examiners confirm credibility
As for other Eurovent ratings, Eurovent commissions independent institutes to verify whether manufacturers’ claims are indeed credible. Only once credibility has been established for the complete range – here, this means for all fine-particle filters in the product line – can these products carry the energyefficiency label.
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