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Vapor compression technologies heavily reply on high-efficient compressors to meet the heating and cooling load requirements. Advances in manufacturing techniques and computational resources along with refrigerant and energy efficiency requirements are driving the hunt for the next generation compressors. This seminar will focus on design optimizations and challenges of both positive displacement and turbo-compressors for heat pumping applications with particular emphasis on low-GWP refrigerant solutions and alternative integrated solutions.

1. Turbo Compressors and Low-GWP Refrigerants in Large Commercial and Heat Pump Systems
   Drew Turner and Leping Zhang, Danfoss Turbocor Compressors, Inc., Tallahassee, FL
2. The Thermodynamic Behaviour of Low-GWP Zeotropic Mixtures on Water-Source Heat Pump Equipment
   Saad Saleem, Student Member1 and Craig Bradshaw, Ph.D., Member2, (1)Oklahoma State University (OSU), Stillwater, OK, (2)Oklahoma State University, Stillwater, OK
3. The Case for DC Powered Residential Heat Pumps
   Jonathan Ore, Student Member, Davide Ziviani, Ph.D., Member and Eckhard Groll, Dr.Ing., Fellow ASHRAE, Purdue University, West Lafayette, IN