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As shown in Figure 1, the hourly averaged local CO ppm rise becomes half the maximum CO ppm rise using the same ventilation flow rate with conventional piston or mixed ventilation strategies.
Consequently, if a high ACH is required and the ventilation can be designed to be close to a piston flow in a car park, the PRESEV strategy may have the potential to significantly reduce the ventilation flow rate requirement and the related energy use for CO dilution.
Case 1: Conventional Ventilation and case2: PRESEV Strategy