182 TDA-System The distance between the fans and a cold outside wall is 1/2 D to compensate for the cooling off of hot air in this area and the resulting reduction in buoyancy. Number of fans First, the selection diagram is used to determine the number of units per 1,000 m² and the size of the TDA units based on the room height. Starting on the vertical axis, find the relevant room height and move right until it intersects with the characteristic. From there, move vertically down to find the number of units required. In the colour transitions between two sizes, planners can choose between either size. Fan spacing For planning, it is necessary to find dimension D, the average distance between TDA units. This is calculated using the following formula: Indoor tennis courts Particular layout rules apply here. In halls used for tennis and badminton, fans should ideally be installed between the courts to avoid visually distracting the players. Two units should be installed 5 - 8 m away from each side of the net. The average air speed at approx. 1 m high should be set to between 0.15 and 0.40 m/s, depending on the players’ sensitivity (maximum speed limited on TDA-Control). Two TDA 1200 I units should be included for a hall with two courts, four units for a threecourt hall, six for a four-court hall, etc. Selection diagram for number of units/1,000 m²: Depending on the room height (ver tical axis), move horizontally right until the point of intersection with the red characteristic, then vertically down. The horizontal axis shows the number of TDA fans required per 1,000m². The fan size is indicated by the background colour at the point of intersection with the red line Room height (m) Number of TDA fans/1,000 m² Example A storage hall with a length of 41 m and a width of 24 m is to be fitted with a TDA system. The hall is 8 m high. The table is used to determine that approx. six units per 1,000 m² are needed (dotted line). The selection point lies between the blue and the green ranges; in this case the planner can choose between the TDA 1200 I and TDA 1400 I models. The actual size of the hall is 984 m²; i.e.: In our example, the average distance D is calculated as follows: This means that, in our example, six TDA 1400 I COURT 1 COURT 2 COURT 3 COURT 4 or TDA 1200 I units are needed for optimum warm air recirculation and to ensure sufficient ventilation. The average distance D is 12.8 m. This means that three fans are needed along the length of the hall (41 m) and two across its width (24 m). The distance to each external (cold) wall is 1/2 D = 6.4 m. Number of units required per 1,000 m2 1,000 12.8
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