The operational and functional criteria of heating, ventilation, and air conditioning (HVAC) systems and associated control systems for cleanrooms and other similar critical applications impose very demanding requirements on both the installed systems and the system designers. Designers and facility operators often compromise original reliability criteria due to rule-of-thumb decision making processes. These processes do not usually include a truly determinant method of evaluating, in a quantitative manner, the advantages and disadvantages of alternative HVAC and control systems with respect to redundancy, reliability, and availability. A methodology as proposed here should help to enhance the decision making processes associated with defining availability criteria and predicting the effects of alternative HVAC and control systems on critical facility operations.

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