Design tool for optimizing the selection of ventilation plants.

The main goals for this design tool are: - A powerful, but simple to use, technical and economic tool for selecting a ventilation plant. - Guide and control the consultants in accordance with the owner's economic preferences. - The long run extra cost, if one is forced not to follow the guidelines of the method is calculated in order to get the economic backgrounds for a decision. - Creating a key-value for the cost of ventilation that can be understood by engineers and people with economic education. The three most important parts of the selection of this design tool are: 1. The representative or equivalent parameters called "the equivalent working condition". This operating condition has the same electric energy consumption as the sum of all running condition of the selected ventilation plant will run at. VAV system is transformed to a CAV system running at a fixed air flow rate. 2. Selecting key-values are presented, for the pressure drop in the plant, fan efficiency and the efficiency of the heatrecovery equipment and optimal specific fan power, to guide the designer. 3. When the selection is made the "specific total cost" of the selected plant is calculated and compared with the optimal cost. This "specific total cost" describes the cost for operation, maintenance and capital cost for the ventilation-function. * The kernel of this design tool (selection method) is " the database of performance and investment cost for manufactured ventilation plants" , " The general economic evaluation key-values stipulated by the owner " and "the equivalent conditions ". This kernel make it possible to find the best set of performance key-values similar to the ventilation plants that have the lowest Life Cycle Cost in the database.The performance sets with lowest Life Cycle Cost in the database, modified to suite "the equivalent working condition", are chosen to derive performance key-values diagrams.