These examples demonstrate the importance of engineers examining room or zone loads at conditions at which economizer operation is limited, with the expected internal loads (people, lights, etc.). The room-load process line then can be plotted on a psychrometric chart. Supply-air conditions under economizer operation fit into one of three cases: Blended outdoor and return air, as shown in figures 4 and 7. 100-percent outdoor air when room load equals the capacity of the economizer ...

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