Reliability analysis of ventilation systems

Abstract

1. The reliabiity of devices switching the standby units by means of trapdoors in channels with unit-by-unit duplication is insufficient, because of the ineffective structure (series connections), difficult operational conditions, and impossibility by duplicating the components of the system. 2. The calculated probability of failure-free operation of an equivalent device for activating redundancy on systems with block-by-block duplication (scheme D), where the components are duplicated, and operational conditions are less demanding, is higher by 7.5 times than the reliability of the activating the redundancy unit with scheme A (VTsD fans); it is higher by a factor of 4.0 than the probability of failure-free operation of unit switching devices with scheme B (VOD fans). 3. The reliability of units with block-by-block redundancies (scheme D), where the units have separate backup duplication and the switching devices have a higher reliability, is greater by a factor of 2.4 than the reliability of systems based on scheme A (with VTsD fans), and by a factor of 1.5 than the scheme B (systems with VOD fans). 4. The reliability of systems based on schemes C and C′ is high, but their applications are limited by technological and engineering considerations, since the power of their drives is limited by the size of the fan sleeve, requiring a single-stage execution and low adaptability of the machine.