The quantity of air which has to be provided depends on the purpose to which the halls is put, i.e. if it is used purely as a training facility for a limited number of athletes, if sporting events with spectators are held there or, in the case of multipurpose halls, if large numbers of spectators can be expected at events.
Table below shows the most important dimensions of the commonest hall types. The individual areas or courts in multipurpose facilities are separated by means of curtains or sliding partitions and are therefore to be viewed individually from the point of view of ventilation. This means that as a rule, the areas for which air distribution has to be provided will measure 15 x 27 m or 22 x 22 m.
The quantity of air which has to be provided depends on the purpose to which the hall is put, i.e. if it is used purely as a training facility for a limited number of athletes, if sporting events with spectators are held there or, in the case of multipurpose halls, if large numbers of spectators can be expected at events. 60 m³/h of fresh air per athlete and 20 m³/h of fresh air per spectator are required. And as the number of people using such a hall varies greatly from day to day and at different times of day, it makes sense to consider installing a ventilation system which can adapt to suit these widely varying requirements in operation.
The sport hall in Goldbach (Germany), is a typical dual-purpose hall with a narrow spectator area. The supporting structure consists of wooden trusses, making the installation of ducting impossible. The operators therefore chose a decentralised ventilation system comprising one unit per court, each with energy recovery and an air flow rate of 5500 m³/h. These units also supply the heating for the hall. The integrated Air-Injector air outlets with high induction represent an extremely effective solution. In the occupied area of the courts, they provide intensive, draught-free air distribution which automatically ensures an even distribution of temperature. And with a measured stratification of only 0.15 K/m, they save energy as a result of the low temperature difference between floor and ceiling.
As the hall is a multipurpose facility which is also used for "quieter" events, the units are equipped with supply and extract air silencers. And the use of two-speed fans allows the system to be adjusted for varying numbers of people. The two-speed function can also be used to reduce the operating sound level where required.
Picture 3: The units are equipped with supply and extract air silencers.
The plant is controlled and regulated by means of a control system especially developed to meet the requirements of decentralised systems. It allows different operating modes in
the different areas of the hall, tailored to the varying uses to which the hall is put at different times. For example, it is possible to supply one court with
fresh air while the other is maintained at a lower temperature if it is not in use. Another important feature of the control system is the automatic adjustment of
the air outlets in dependence on the difference between supply and room air temperature.
The overall results are convincing. The people who use the hall enjoy the benefits of comfortable room air conditions, while the operators appreciate the low-maintenance, energy-efficient system.
Experience with other sports
halls has shown that an Air-Injector air outlet provides excellent ventilation and temperature distribution even for courts measuring 15 x 27 m.
Long-range nozzles do not perform so successfully in tests, as this method of air distribution cannot provide such even distribution of temperature.
The advantages offered by a decentralised system make it ideal for use in
sports halls and multipurpose halls. The fact that no ducting is required, the low weight and compact design of the units make for a considerable weight-saving of up to 70 % in comparison with a centralised unit, and this makes the overall supporting structure of the hall lighter. In particular, the low weight and compact design mean that the system is also easy to incorporate into the roof structure when carrying out conversion work on existing halls. There is no need for an additional equipment room.
The ventilation and heating units are supplied ready-to-connect, fully assembled and pre-wired, reducing the cost and time required for design. The same applies to their installation, which is also quick and easy.
In short, their high flexibility makes decentralised systems ideally suited to meeting the widely varying requirements of sports halls and multipurpose halls – and all that at a very competitive price.
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