Before a demand response event begins, an office building drops its cooling setpoint for one to two hours so that the interior is cooled below normal. When the event then starts, cooling is eased off and the setpoint is allowed to drift upward. The energy-management rationale for the pre-cool step is that:

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Accepted Answer

Thermal energy is stored in the building fabric before the event, and the cool mass carries the zone through the reduction without active cooling.

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The reduction is visually disguised from the grid operator, which typically results in a larger credited reduction after the event.

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The cooling work is shifted into a lower-price tariff window that immediately precedes the event and takes advantage of off-peak rates.

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The cooling equipment is stress-tested before the event begins so that any faulty component can be identified before the reduction.

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Before a demand response event begins, an office building drops its cooling setp...

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