Xin-Rong Zhang is a full professor of Department of Energy & Resources Engineering, College of Engineering, Peking University. He is also director of Beijing Engineering Research Center of City Heat, Director of Center for New Energy System of Peking University, Chairman of Beijing Energy Society. He worked 20 years in the field of using CO2 as working fluids and refrigerant in energy conversion systems, such as cooling and refrigeration, solar, heat pump, power generation etc.. He has been leading more than 10 projects on CO2 cooling, heating and refrigeration, both from science and industrial sections. Trygve Magne Eikevik is a full professor in Energy and Process Engineering at the Norwegian University of Science and Technology. He also owns a rich research experience from 20 years working at SINTEF Refrigeration and Air Conditioning. He was President of The Norwegian Society of Refrigeration. Refrigeration technology using CO2 originated fromNorwegian Societies. He worked more than 30 years in this field. He led many R&D projects on food and energy fields using CO2 as working fluids.

• Introduction.- Natural Refrigerants and Carbon Dioxide.- CO2 Vapor Compression Cycles related to Refrigeration.- Theoretical Analysis of Expansion Process and Components in CO2 (Transcritical) Refrigeration System.- Study on CO2 Evaporation and CO2 Evaporators+Gas Cooler.- CO2 Commercial Refrigeration Cycle and Systems.- CO2 Refrigeration System for Ice Rink and Snow Making.- CO2 Air-Conditioning System.- Industrial Cooling System.- CO2 Trans-triple-point Refrigeration Method.