What is Reynolds Number

Supercritical CO2 has been given much attention to be a working fluid in a power cycle due to its unique properties. The supercritical CO2 solar Rankine cycle system was designed and developed by using the benefit of supercritical state of CO2 to generate electric power and supply heat energy in environmentally friendly manner. The development of main components in the system are introduced and discussed particularly by focusing on the properties of CO2 for obtaining higher performance. The properties of CO2 in near critical region are also discussed in this chapter. Operating the power cycle in the supercritical region of CO2 enhances the heat transfer in energy exchanging process and improves the cycle efficiency.