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z] or Z), whereas, the outdoor air fraction in the SDCV strategy responds faster by increasing the airflow rate in order to maintain the supply air C[O.
This is the best case to demonstrate the advantage of the SDCV strategy.
From the above three tests, it could be concluded that the SDCV strategy is much better than the DCV strategy in terms of respecting indoor air quality (1000 ppm) when the thermal (airflow rate) and ventilation (occupancy) load distributions between zones are significant (Figure 6a and 7).
Outdoor air fractions determined by SDCV and DCV strategies tend to follow the C[O.
The steady-state performance of a VAV system working under DCV and SDCV strategies is now investigated.
z]) obtained from DCV and SDCV strategies are calculated.
z], and the critical zone could be slightly underventilated with the DCV strategy and slightly overventilated with the SDCV strategy.
The SDCV strategy on the other hand could overcome this problem by providing exact outdoor air (point b1) or slightly higher outdoor air (any point on the line between b1 and b2).
In the first test (in the case of SDCV strategy), the supply C[O.
2] concentration setpoint when the SDCV strategy is applied is constant during the investigated period (840 minutes).
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