Piljae Im

Piljae Im

R&D Staff

Bio

Dr. Piljae Im is currently serving as R&D staff in the Whole-Building and Community Integration (WBCI) 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.

Publications

Kim, D., S. Cox, H. Cho, and P. Im (2017) Evaluation of Energy Savings Potential of Variable Refrigerant Flow (VRF) from Variable Air Volume (VAV) in the U.S. Climate Locations. Energy Reports (In review)

Kim, Dongsu, S. Cox, P. Im, and S. Cox (2017) Modeling and Calibration of a Variable Refrigerant Flow (VRF) System with a Dedicated Outdoor Air System (DOAS), Proceedings of Building Simulation 2017. August 7-9, 2017.

Im, P. and X. Liu (2017) Energy Performance Evaluation of a Recycled Water Heat Pump (RWHP) System in Cool and Dry Climate Zone, 2017 IGSHPA Technical/Research Conference and Expo, Denver, CO, March 14-16.

Liu, X., M. Malhotra, and P.Im (2017) Performance Analysis of Ground Source Heat Pump Demonstration Projects in the United States. 12th IEA Heat Pump Conference, Rotterdam, Netherlands, May 15 – 18, 2017.

Im, P., M. Malhotra, J. Munk, and J. Lee (2017) Full and Part Load Performance Evaluation of Variable Refrigerant Flow (VRF) System Using an Occupancy Simulated Research Building, 2017 ASHRAE Winter Conference, Las Vegas, NV. Jan 28 – Feb 1, 2017.  

Kim, Dongsu, S. Cox, S. Cox, and P. Im (2016) Evaluation of Energy Saving Potential of Variable Refrigerant Flow (VRF) Systems Compared with Variable Air Volume (VAV) Systems in the U.S. Climate Locations, IBPSA Asia Conference (ASIM 2016), Jeju, South Korea, November 27 – 29, 2016.

Im, P., M. Malhotra, J. Munk, and J. Lee (2016) Cooling Season Full and Part Load Performance Evaluation of Variable Refrigerant Flow (VRF) System Using an Occupancy Simulated Research Building, 16th International Refrigeration and Air Conditioning Conference at Purdue, West Lafayette, IN., July 11 – 14, 2016.

Chaudhary, G., J. New, S., Jibonananda, P. Im, Z. O’Neil, and V. Garg (2016) Evaluation of “Autotune” Calibration Against Manual Calibration of Building Energy Models, Applied Energy, V(182) 115 -134.  

Im, P. and X. Liu (2015) Performance Evaluation of a Ground Source Variable Refrigerant Flow (VRF) System for a University Building in Cold Climate, The 24th IIR International Congress of Refrigeration, Yokohama, Japan, August 23 -28, 2015.

Im, P., J. Munk, and K. Song (2015) Evaluation of Variable Refrigerant Flow (VRF) Systems Performance in ORNL's Flexible Research Platform (FRP, The 24th IIR International Congress of Refrigeration, Yokohama, Japan, August 23 -28, 2015.

Liu, X., M. Malhotra, and P.Im (2015) Case studies for GSHP demonstration projects in the US, HPC Newsletter, Vol (33) 29-33.

Im, P., J. Munk, and K. Song (2015) Evaluation of Variable Refrigerant Flow (VRF) System Performance Using an Occupancy Simulated Research Building: Introduction and Summer Data Analysis Compared with a Baseline RTU System, 2015 ASHRAE Annual Conference, Atlanta, GA. June 27 – July 1, 2015.

Xia, J., T. Hong, Q. Shen, W. Feng, L. Yang, P. Im, A. Lu, and M. Bhandari (2014) Comparison of Building Energy Use Data between the United States and China, Energy and Buildings, Vol (78) 165-175.        

Im, P., and B. Bhandari (2014) Is Monthly And Whole Building Level Calibration Enough? : A Detailed Modeling And Calibration Study Of An Ultra-Efficient Occupancy Simulated House, 2014 ASHRAE/IBPSA-USA Building Simulation Conference, Atlanta, GA. September 10 – 12, 2014.

Im, P., and M. Malhotra (2014) Evaluating Energy Efficiency Retrofits in Multifamily Housing, 2014 ASHRAE/IBPSA-USA Building Simulation Conference, Atlanta, GA. September 10 – 12, 2014.

Malhotra, M. and P. Im, and (2014) Need for Systematic Retrofit Analysis in Multifamily Buildings, 2014 ACEEE Summer Study on Energy Efficiency in Buildings, Pacific Grove. CA. August 17-22, 2014

Spitler, J. & P. Im (2013) Foundation heat exchangers for residential ground source heat pump systems, International Energy Agency (IEA) HPC Newsletter, 31, 34-37

Im, P., P. Hughes, X. Liu (2012) Demonstration and Performance Monitoring of Foundation Heat Exchangers(FHX) in Ultra-High Energy Efficient Research Homes, 2012 ACEEE Summer Study on Energy Efficiency in Building, Pacific Grove, CA, August 12-17, 2012

Malhotra, M., P. Im (2012) Development of a Flexible, Multizone, Multifamily Building Simulation Model, SimBuild 2012, Madison, WI, August 1-3.

Im, P., M. Bhandari (2012) Use of Flexible Research Platforms (FRP) for BIM and Energy Modeling Research, Conference paper, 2012 ASHRAE Annual Conference, San Antonio, TX, June 23-27

Shonder, J., P. Im. (2012) Bayesian Analysis of Savings in Retrofit Projects, 2012 ASHRAE Transaction.

Im, P., X. Liu, J. Munk (2011) GSHP Value Rising, Solar Today, March 2011, pp 28-31 

Xing, L., J. Cullin, J. Spitler, P. Im., D. Fisher (2011) Foundation Heat Exchangers for Residential Ground Source Heat Pump Systems - Numerical Modeling and Experimental Validation, HVAC&R Research Journal, Vol. 17 (6): pp 1059-1074.

Im, P. and Haberl, J. (2010) Analysis of the Energy Savings Potential in K-5 Schools in hot and Humid Climates: Application of High Performance Measures and Renewable Energy Systems, Proceedings of the 2010 SIMBUILD Conference.

Spitler, J., L. Xing, J. Cullin, D. Fisher, J. Shonder, P. Im. (2010) Residential Ground Source Heat Pump Systems Utilizing Foundation Heat Exchangers. Proceedings of Clima 2010, Antalya Turkey, May 9-12.

Im, P. and Haberl, J. (2008) Development of a Simplified Simulation Tool for High Performance K-5 Schools in Hot and Humid Climates, Proceedings of the 2008 SIMBUILD Conference.

Malhotra, M.; Im, P.; Haberl, J.; Fisk, P.; Canez, J.; Schaider, N.; Feigenbaum, L.; Ramirez, E.; Cho, S. (2008) Design, Construction, Transportation, Operation and Post-Occupancy Analysis for the Texas A&M Solar Decathlon House, 16th Annual Symposium on Improving Building Energy Efficiency in Hot and Humid Climates, Plano, Texas, December 15-17.

Baltazar, J., Im, P., Haberl, J., Liu, Z., Mukhopadhyay, J., Culp, C., Kim, S., Gilman, D., Yazdani, B. (2007) A Methodology for Calculating Intergrated NOx Emissions Reduction From Energy Efficiency and Renewable Energy (EE/RE) Programs Across State Agencies in Texas, Proceedings of the 15.5 th Symposium on Improving Building Systems in Hot and Humid Climates.

Im, P. and Haberl, J. (2006) A Survey of High Performance Schools, Proceedings of the 15th Symposium on Improving Building Systems in Hot and Humid Climates.

Ahmad, M., Im, P., Mukhopadyay, J., Malhotra, M., Haberl, J., Culp, C., and Yazdani, B. (2006) , Impact of the Implementation of the 2000/2001 IECC on Residential Energy Use in Texas: Analysis of Residential Energy Savings. Proceedings of the 15th Symposium on Improving Building Systems in Hot and Humid Climates.

Kim, S., Ahmad, M., Im, P., Choncharoensuk, C., Haberl, J., Culp, C., and Yazdani, B. (2006) , Impact of the Implementation of the 2000/2001 IECC on Commercial Energy Use in Texas: Analysis of Commercial Energy Savings. Proceedings of the 15th Symposium on Improving Building Systems in Hot and Humid Climates.

Haberl, J., Im, P., Culp, C., Yazdani, B., Fitzpatrick, T., Bryant, J., Verdict, M., and Turner, D. (2005) A simulation methodology to estimate NOx emissions reductions from the implementation of the 2000 IECC/IRC Conservation Code in Texas., ibpsa NEWS, Vol. 15 no. 2.

Haberl, J., Culp, H., and Im, P. (2004) Methodology to Calculate NOx Emissions Reductions from Implementation of the 2000 IECC/IRC Conservation Code in Texas, Proceedings of the 14th Symposium on Improving Building Systems in Hot and Humid Climates.

Haberl, J., Im, P., Culp, C., Yazdani, B. and Fitzpatrick, T. (2004) NOx Emissions Reductions from Implementation of the 2000 IECC/IRC Conservation Code to Residential Construction in Texas, Proceedings of the 14th Symposium on Improving Building Systems in Hot and Humid Climates.

Haberl, J., Lewis, T., Im, P., and Carlson, K. (2004) Development of a Measurement and Verification (M&V) Costing Toolkit, Proceedings of the 14th Symposium on Improving Building Systems in Hot and Humid Climates.

Haberl, J., Im, P., Culp, C., Yazdani, B., Fitzpatrick, T., Bryant, J., Verdict, M., and Turner, D. (2003) Calculation of NOx Emission Reduction from Implementation of the 2000 IECC/IRC Conservation Code in Texas, Proceedings of International Conference for Enhanced Building Operations.

Haberl, J., Im, P., Culp, C., Yazdani, B., Fitzpatrick, Turner, D., and Verdict, M. (2003) Procedure for Calculation of NOx Emission Reduction from Implementation of the 2000 IECC/IRC Conservation Code in Texas, Proceedings of Eighth International IBPSA Conference.

Technical Reports

Im, P., M. Bhandari, and J. New (2017) Calibrated EnergyPlus Model of Flexible Research Platform (FRP) with Baseline RTU-VAV Reheat System, Technical Report, ORNL/TM-2017/4.

Im, P., and J. New (2017) Updated OpenStudio Large Office Prototype Model, Technical Report, ORNL/TM-2017/1.

Im, P., and H. Buckberry (2016) Market Assessment for Non-Invasive Thermal Flow/BTU Metering Using Heat Flux Sensors, Technical Report, ORNL/TM-2016/697.

Im, P., X. Liu, and H. Henderson (2016) Case Study for the ARRA-Funded Ground Source Heat Pump Demonstration at Ball State University, Technical Report, ORNL/TM-2016/644.

Im, P., M. Malhotra, and J. Munk (2016) Evaluation of Variable Refrigerant Flow Systems Performance on Oak Ridge National Laboratory’s Flexible Research Platform: Part 1 Cooling Season Analysis, Technical Report, ORNL/TM-2016/364.

Im, P., M. Malhotra, and J. Munk (2016) Evaluation of Variable Refrigerant Flow Systems Performance on Oak Ridge National Laboratory’s Flexible Research Platform: Part 2 Heating Season Analysis, Technical Report, ORNL/TM-2016/365.

Im, P., H. Cho, D. Kim, and S. Cox (2016) Evaluation of Variable Refrigerant Flow Systems Performance on Oak Ridge National Laboratory’s Flexible Research Platform Part 3 Simulation Analysis, Technical Report, ORNL/TM-2016/386.

Im, P., M. Bhandari, and J. New (2016) Multiyear Plan for Validation of EnergyPlus Multi-Zone HVAC System Modeling using ORNL’s Flexible Research Platform, Technical Report, ORNL/TM-2016/286.

Im, P., J. New, and M. Bhandari (2016) Validation Plan for EnergyPlus Multi-Zone HVAC System using ORNL’s Flexible Research Platforms, Technical Report, ORNL/TM-2016/101.

Malhotra, M., M. Bhandari, P. Im., and H. Buckberry (2015) DOE ESPC Lessons Learned Report, Technical Report ORNL/TM-2015/481.

Im, P., and X. Liu (2015) Case Study for the ARRA-funded GSHP Demonstration at Denver Museum of Natural and Science, Technical Report, ORNL/TM-2015/473.

Im, P., J. Munk, and A. Gehl (2015) Evaluation of Variable Refrigerant Flow Systems Performance and the Enhanced Control Algorithm on Oak Ridge National Laboratory’s Flexible Research Platform, Technical Report, ORNL/TM-2015/225.

Im, P., and X. Liu (2014) Case Study for ARRA-funded Ground- Source Heat Pump (GSHP) Demonstration at Oakland University, Technical Report, ORNL/TM-2014/712.

Bhandari, M., P. Im., and H. Buckberry (2014) ORNL One Story Flexible Research Platform Test Building Air Leakage Study, Technical Report, ORNL/TM-2014/445.

Im, P., and K. McAllister (2014) Combine Heat and Power Assessments for Fort Bragg, Technical Report, ORNL/TM-2014/205.

Im, P., and R. Jackson (2014) Probabilistic Reliability Assessment of Predicted Energy Savings in Residential Buildings, Technical Report, ORNL/TM-2014/148.

Buckberry, H., M. Bhandari, and P. Im., and H. Buckberry (2013) Research and Development Roadmap for the Metal Building Industry, Technical Report, ORNL/TM-2013/419.

Im, P., C. Castello (2013) Central Heating Modernization at Misawa Air Base, Japan. Technical Report, ORNL/TM-2013/96.

Im, P., C. Castello (2013) Central Heating Modernization at Yokota Air Base, Japan. Technical Report, ORNL/TM-2013/95.

Im,P., X. Liu (2013) Feasibility Study of Using Ground Source Heat Pumps at Dahlgren Division, Naval Support Activity, South Potomac. Technical Report, ORNL/TM-2013/25.

Im, P., E Kim, M. Malhotra, R. Stephenson, and S. Roberts. (2012). Case Study of the Maplewood Park Multifamily Retrofit for Energy Efficiency. Technical Report, ORNL/TM-2012/592.

Im, P., M. Bhandari (2012) Validation of the Technologies Installed in the ZEBRAlliance Homes Using a Calibrated Simulation. Technical Report, ORNL/TM-2012/590.

Im, P. (2010) American Recovery and Reinvestment Act (ARRA): FEMP Technical Assistance, U.S. Naval Bases Sasebo, Misawa, Japan & Whidbey Island, Lemoore, U.S. Project 253 U.S. Navy Design Study of GSHP Systems at Japan, Technical Report, Oak Ridge National Laboratory, Oak Ridge, TN.

Im, P. (2010) American Recovery and Reinvestment Act (ARRA): FEMP Technical Assistance, U.S. Air Force Hill Air Force Base (AFB) Project 121 Energy Security for Hill AFB, Technical Report, Oak Ridge National Laboratory, Oak Ridge, TN.

Im, P., J. Shonder (2009) Feasibility Study of Using Ground Source Heat Pumps at the Sullivan Elementary School, Yokosuka, Japan, Technical Report, Oak Ridge National Laboratory, Oak Ridge, TN.

Im, P., J. Shonder (2009) Feasibility Study of Using Ground Source Heat Pumps in Two Buildings at Whidbey Island Naval Air Station, Technical Report, Oak Ridge National Laboratory, Oak Ridge, TN.

Diem, A.; Mulholland, D.; Yarbrough, J.; Baltazar, J. C.; Im, P.; Haberl, J. S. (2008) Estimation of Annual Reductions of NOx Emissions in ERCOT for the HB3693 Electricity Savings Goals, United States Environmental Protection Agency (EPA); ESL-TR-08-12-04, Energy Systems Laboratory, Texas A&M University

Im, P., Cho, S., and Haberl, J. S. (2005) Literature Review on Underfloor Air Distribution (UFAD) Systems, ESL-TR-05-05-01, Texas Engineering Experiment Station, Texas A&M University System.

Cho, S., Im, P., and Haberl, J. S. (2005) Literature Review of Displacement Ventilation, ESL-TR-05-05-01, Texas Engineering Experiment Station, Texas A&M University System.

Haberl, J., Zhu, Y., and Im, P. (2004) Reduction of NOx Emissions in Alamo Area Council of Government Projects, ESL-TR-04-05-01, Texas Engineering Experiment Station, Texas A&M University System.

Haberl, J. S.; Powell, T.; Carlson, K.; Im, P.; Turner, W. D., U. S. Army Measurement and Verification (M&V) Costing Toolkit, ESL-TR-03-12-01, Energy Systems Laboratory, Texas A&M University.

Haberl, J, Im, P, Culp, C., Yazdani, B., Fitzpatrick, T.,  Verdict, M., Turner, W. D. (2003) Procedure to Calculate NOx Reductions Using the Emissions & Generation Resource Integrated Database (E-Grid) Spreadsheet, ESL-TR-03-07-01, Texas Engineering Experiment Station, Texas A&M University System.

Im, P., Haberl, J., and Ahmad, M. (2002) Detailed Description of Data for Texas' Senate Bill 5 Legislation for Reducing Pollution in Non-Attainment and Affected Areas, ESL-TR-02/11-01, Texas Engineering Experiment Station, Texas A&M University System. 

 

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