Abstract
The reliability on air volume of ventilation system in volume adjustment by frequency conversion of fan was theoretically studied. Based on the law of large numbers, the probability could be transformed to frequency ratio with fully considering the fluctuation of air volume. Two conversion formulas for transforming air volume under normal working frequency into air volume under required frequency with or without considering natural ventilation pressure were deduced. On this basis, the reliability of air volume under required frequency can be predicted through measuring air volume under normal working frequency, then the unknown reliability can be predicted before volume adjustment by frequency conversion of fan. The reliability matrix and reliability value matrix on air volume of ventilation system were deduced and constructed. The relationship between the matrices and fan frequency was theoretically analyzed, as well as the forecast on reliability matrix and reliability value matrix of the required frequency based on the conversion formulas.
Published Version
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