University of Tehran

A new exhaust ventilation system design software

By industries development, the amount of air contaminants that are released in workplace has grown increasingly. To reduce these contaminants, there are several methods that, one of which is control at source. Industrial ventilation is perhaps the most powerful tool available for environmental professionals to control workplace pollution. Exhaust ventilation can capture contaminants at source, refine and eliminate them, and as a result reduces workplace pollution and work related diseases caused by them (ACGIH, 2001; Burton, 1994). It is estimated that tens thousand of new industrial exhaust ventilation systems are installed annually. If we assume that the average capacity is 1000cfm with installation costs of 5$ per cfm and yearly expense of 2$ per cfm, it is apparent that this presents a considerable investment. However, many of these systems are improperly designed, are not installed according to plans, leading to tremendous loss as a result of inefficiency. All ventilation systems must be designed so perform adequately for all conditions. (William et al., 2004). If designer is not very experienced in system balance or is not familiar with air flow behavior in ducts, branch entrances, and fittings, an error in loss coefficient selection and manual calculations may cause system to be unbalanced and as a result be inefficient. As computers are getting faster, powerful, more reliable, cheaper and more accessible, their areas of application are also becoming widespread.

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