Fast selection now possible of energy-saving air-handling units
29. July 2009 GEA design software L|plus| assigns models in the GEA CAIR|plus| range to the new Eurovent energy-efficiency classes
plus is now the very first company to assign air-handling units to the new Eurovent energy-efficiency classes A to F. With this program Lplus, customers can now not only individually configure the models in the GEA CAIRplus range, but can also check them for energy-efficiency according to the latest criteria. Life-cycle cost calculations complete the selection process. These calculations allow conclusions on the cost-effectiveness of the models under planned conditions of use.
Before ordering of actual systems, Lplus provides planners and decision-makers with reliable data on how energy-efficient the configured model is. The program assigns a model being considered to the new Eurovent efficiency classes on the basis of 3 criteria: the air speed in the internal cross-section, the heat-recovery coefficient and pressure drop of the heat-recovery units, as well as the power consumed by the fan. Eurovent classification takes place in accordance with the new procedure, the new features of which include significantly more precise gradation than earlier (see text in box below).
If the configured model does not satisfy the requirement of the required efficiency class, the user enjoys various modification options: e.g., enlargement of the model cross-section, selection of a different energy-recuperation unit, or use of a more efficient fan. The current version of Lplus, 5.37, allows selection, for example, of EFF-1 motors that have efficiencies up to 10% greater than EFF2 drives. One of the benefits of the ECOPLAT-TWIN double-plate heat exchanger is its high heat-recovery coefficient and, in turn, the good Eurovent classification that it enables. Most recently, moreover, the plate spacing that can now be selected for ECOPLAT double-plate heat exchangers enables greater design leeway. Proper selection of plate spacing (“S”) allows good heat recovery – as well as greater pressure drops, which require the use of efficient fans. “M” stands for mean values, and “L” is the optimal solution when low pressure drops are more important than a high heat-recovery coefficient.
New energy-efficient classes in accordance with Eurovent – these have now changed
The new Eurovent energy-efficiency classes A to F, presented this year at the specialist trade show ISH, replace the old scale of A to C. Calculation of the classes is now based on the revised version of DIN EN 13053 (not yet published). Also new are the compensation options between the criteria. Now, not all limit values of an efficiency class must be simultaneously fulfilled to achieve a certain class. For example, a more efficient fan or an enhanced heat recovery can compensate for increased air speed in the model. An additional new requirement is that all models in classes A to E must be equipped with heat recovery. Class F places no requirements on the energy efficiency of the models, but verifies conformity with the other tests in the Eurovent program (e.g., model box test and output tests).
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