Describe a condenser water reset strategy and how it saves energy in a chiller plant.

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Condenser water reset uses outdoor conditions to adjust the condenser water supply temperature, letting the condenser operate more efficiently as ambient conditions change. On cooler days, the outside air can reject heat more easily, so the condenser water can be run colder. Lower condenser water entering the condenser reduces the condensing temperature and the condenser pressure, which in turn lowers the work the compressor must do. Since the compressor is the major energy user in most chiller plants, this leads to meaningful energy savings. As outdoor conditions rise, the reset curve raises the condenser water setpoint to avoid overworking the cooling tower and to keep heat rejection reliable, preserving system stability. In short, by matching the condenser water temperature to the ambient, the plant often runs the compressor at a lower head pressure, cutting energy use overall. Keeping the condenser water temperature fixed misses these efficiency opportunities, and trying to increase the temperature all days would degrade performance on hot days; eliminating cooling towers isn’t a practical or accurate description of what reset does.