Dr. Piljae Im is currently serving as R&D staff in the Building Envelope & Urban Systems Research (BE&USR) Group in the Building Technologies and Research Integration Center (BTRIC). He received his Ph.D. and Masters of Science degree in Architecture from Texas A&M University. Since he joined ORNL in 2009, he has served as PI and Co-PI for numerous research projects sponsored by DOE’s Building Technologies Office (BTO), U.S. Department of Defense (DoD), and domestic and international industry partners. Dr. Im’s research has focused on detailed calibration of building energy simulation models based on field measured data, development of prototype building models, and validation and uncertainty characterization for energy simulations. He has been also very active in evaluation of Variable Refrigerant Flow (VRF) system performance in occupancy emulated research building, and development of enhanced control algorithm for VRF systems. Another area he’s been focused is measurement and verification (M&V) for numerous building systems such as micro combined heat and power (CHP) systems and Ground Source Heat Pump (GSHP) systems. He has more than 15 years of experience in building energy simulation modeling, and a user of numerous building energy and daylighting simulation software such as EnergyPlus, OpenStudio, eQuest, Radiance, and DOE-2.1e. He has authored and co-authored more than a dozen of peer-reviewed conference and journal papers. Dr. Im is active an member of International Building Performance Simulation Association (IBPSA) and American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), and a voting member of numerous technical committees including ASHRAE TC 8.6 Variable Refrigerant Flow (VRF) system, and ASHRAE GPC 41 Design, Installation and Commissioning of Variable Refrigerant Flow (VRF) Systems.