Design Solution · HVAC & Energy
Design Solution · Dream about it
Setpoints that track real cooling demand to cut part-load energy.
Chilled water supply temperature and flow setpoints follow real cooling demand rather than worst-case design assumptions. Resetting setpoints to the actual call for cooling reduces pumping and chiller energy at part load, which is most of operating hours.
Resetting chilled water supply temperature and flow setpoints against actual cooling demand rather than worst-case design assumptions is the control counterpart to right-sizing plant: it recovers efficiency during the part-load conditions that dominate real operating hours, when a system locked to design setpoints is systematically overcooling and overpumping. The strategy is well documented, and supply temperature reset is a standard component of ASHRAE Guideline 36 sequences for high-performance buildings; the energy savings are measurable and the implementation cost is low relative to hardware alternatives. This record supplies no measured data — no before-and-after energy comparison, no quantified CoP improvement, and no account of the BMS logic or reset schedule used. The honest risk to flag is that demand-based reset requires accurate demand signals, which depend on well-functioning room sensors and zone-level controls; a building with poor BMS instrumentation or zones that routinely call for full cooling regardless of occupancy will see neither the efficiency gain nor the improved comfort response that the strategy promises.
#demand based control #setpoint reset #part load