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5.2 Thermodynamic Analysis of the Expansion Process in Transcritical CO2 Cycles 100 5.2.1 Thermodynamic Losses 100 5.2.2 Effect of Expansion Process 102 5.2.3 Real Transcritical CO2 Expansion 108 5.3 Theory of Ejector-Expansion Devices 111 5.3.1 One-Dimensional Ejector Flow Model 113 5.3.1.1 Critical Two-Phase Flow Model 114 5.3.1.2 Motive Nozzle Flow Model 116 5.3.1.3 Suction Nozzle Flow Model 116 5.3.1.4 Mixing Section Flow Model 117 5.3.1.5 Diffuser Flow Model 118 5.3.2 Ejector Efficiencies 118 5.4 Expansion Work Recovery Devices for Transcritical CO2 Systems 119 5.4.1 Positive Displacement Expanders 120 5.4.1.1 Reciprocating Expanders 120 5.4.1.2 Rolling Piston and Rotary Vane Expanders 121 5.4.1.3 Scroll Expanders 122 5.4.1.4 Screw Expanders 125 5.4.2 Turbine-Type Expanders 127 Nomenclature 131 Greek Symbols 132 Subscripts 132 References 133 6 Transcritical Carbon Dioxide Compressors 137 Xin-Rong Zhang 6.1 Introduction 137 6.2 Sliding Vane CO2 Compressor 138 6.3 Screw CO2 Compressor 140 6.4 CO2 Rolling Rotor Compressor 141 6.4.1 CO2 Compressors Developed by the Company 141 6.4.2 Two-Stage Rolling Piston CO2 Compressor 142 6.5 SCO2 Scroll Compressor 143 6.6 SCO2 Turbo-Compressor 145 6.6.1 SCO2 Turbo-Compressor Applications and Challenges 145 6.6.2 The Two-Phase Axial-Flow Turbine 146 6.6.3 Application of Transcritical Turbine to CO2 Refrigeration Systems 148 6.7 SCO2 Piston Compressor 149 6.7.1 CO2 Challenges from a Compressor Perspective 149 6.7.1.1 High Polytropic Exponent and Discharge Temperatures 150 6.7.1.2 Lubricant 151 6.7.1.3 Discharge Plenum 151 6.7.1.4 Pistons and Compression Rings 152 6.7.2 Design Pressures 153 Contents viiPDF Image | What is a heat pump
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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