Demand Controlled Ventilation. A Detailed Study of Energy Usage by Simulation

Detailed mathematical models of VAV equipment and subsystems have been developed and used tocompose larger DCV systems with a large degree of detail. The models and systems take intoaccount both flow/pressure distribution and thermal/contaminant dynamics. The models have beenvalidated against measurements. A number of detailed simulation cases have been conducted. Theresults show that energy usage depends strongly depends on occupancy, flow rates, chosen setpoints as well as the outdoor temperature. This study shows that savings between 30 and 45% ofenergy usage for equivalent CAV systems can be expected, and that even better results may beobtained if further optimising the control strategy.