Impacts of Duct Leakage on Central heating and Cooling of Outdoor Air
This study seeks to develop an accurate means of estimating impacts of supply duct-system leakage on energy use in commercial buildings with VAV systems, focusing on central-system cooling and outdoor air (OA) preheating. The project team developed a simplified method for characterizing impacts of weather on cooling and preheating outdoor air. The study accounted for duct-system leakage upstream and downstream of VAV boxes, as well as the fraction of OA drawn into the supply fan. The team calculated the required cooling and preheating of outdoor air with and without duct leakage for three California locations, categorized as hot (Palm Springs) and moderate (Riverside and Sacramento).