A ventilation system is defined by making the exchange of air between the interior and the exterior environment with the declared purpose to creating favorable ambient conditions or technological as well. If in the case of environmental fans, industrial or otherwise, the environmental conditions may suffer some tolerances within quite lax limits, in the case of the fans for industrial use, speaking here mostly about technological fans which are creating the conditions for the proper functioning of an entire line of equipment, tolerances and relations flow-pressure must be calculated in tight limits.
Prior to installing an industrial fan any space to be used to its installation must be analyzed, the equipment that it serves directly or by effect, their energy or heating intake and the exhaust air compensation method. So in case of any type of industrial fan, the most important factors to be taken into account in choosing it are: the volume of the space, number of air exchanging shifts per hour required depending on the destination of the space, the heat releases, the amount of heat incoming from outside and other moisture releases. In addition to be analyzed air component, i.e. grain size distribution of dust in air transportation and the environment, explosive or normal. Also working environment should be analyzed from the perspective of chemical agents present to ensure an adequate corrosion protection or the choice of suitable materials for constructing the industrial fan.
Although fans are essentially simple equipment and in principle quite usual, regardless the size or their specific function, even in industry there is a tendency to underestimate the importance, enjoying our attention only when their performance is lacking, affecting, sometimes severely, the operation of other equipment. Therefore the calculation of the required air flow for ventilation and choosing of the right industrial fan can be a real challenge and a wrong choice can lead to its inefficiency.
The airflow can be calculated with the following formula:
room volume [m3] x number of shifts per hour [1 / h] = air flow [m3 / h].
In the case of fan duct is essential to take into account the available static pressure, as this determines the maximum length of the ventilation duct. Depending on the length of the tubing section miscarriages can occur and therefore a decrease in yield industrial fan duct on the farthest portion of the ventilation system, because its aspiration ability decreases as the distance increases.
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Lucian GOJ, Research & Development Director,
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