An Assessment of the Probability of Failure of Air-to-Air Heat Exchangers when Operating Air-Conditioning Systems

The air conditioning system of aviation equipment contains several air-to-air heat exchangers. Air heat exchangers are characterized by maximum intensification of heat exchange, minimum overall dimensions and hydraulic resistance. This justifies the use of thin-walled elements in their design and, consequently, more complex manufacturing technology. This article presents a statistical analysis of failures of air-to-air heat exchangers that constitute part of the air conditioning system of aviation equipment that provide comfortable microclimate on board. The operating life of air-to-air heat exchangers of various design is determined and an analysis of failures during the operation period is performed. The probability of failure due to leakage of units and structures of air-to-air heat exchangers is used as an indicator to assess the efficiency of heat exchangers.

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