Typical examples include individual offices with On outdoor temperature, an occupancy sensor, a window (open or closed) sensor, The buildingĪutomation system may determine the mode of operating based The building “changes-over” between natural ventilation andĪir-conditioning on a seasonal or even daily basis. Zones may go to minimum air when sensor indicates that aĬhange-over (Same space, different times)Ĭhange-over designs are becoming increasingly common, where With standard VAV air-conditioning systems and operable windows, where perhaps perimeter VAV Typical examples include open-plan office space While occupants are free to open windows based on individual May serve as supplemental or “background” ventilation and cooling System and operable windows operate in the same space and Strategy in practice today, in which the air-conditioning Usually in terms of whether they exist in the same space, or operateĬoncurrent mixed-mode operation is the most prevalent design The integration of natural ventilation and air-conditioning control strategies, Yet there are a number of classification schemes that describe There does not seem to be a “standard” mixed-modeĪpproach in practice today – each building continues to be unique. How do the air-conditioning and operable windows work together?
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