In the study, the main reliability parameters of the components of the HVAC system considered, were evaluated. This was possible thanks to real failure data, gathered during 1200 hours of plant operation. These were the available data: expanding the observation period or increasing the sample taken as a reference for the empirical calculation of the reliability parameters, could improve the analysis presented in this paper. In the absence of more data, however, it seemed consistently better to use such information, rather than relying on anonymous and less significant generalist databases.
Table 4.1 shows the failure data for the filters of the air-handling unit: from these real data, fault functions were evaluated. The same was done for the other two components analysed here.