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1.2 - Well known thermodynamic properties - Stability - Non-toxicity - Abundance - Low molecular leak due to higher molecular mass - Low cost Real Gas Behavior Compression near the critical point requires less compressor input work. It is caused by a rapid increase of CO2 density at pressure slightly above the critical pressure (pseudo-critical pressure). The change of compressor work can be seen on Figure 1.1 where is drawn the work needed to compress the fluid from various inlet pressure to compressor outlet pressure 20MPa. For a comparison on the same figure is drawn turbine work produced by expansion for the same pressures (pressure losses are neglected). It shows that the turbine is acting such as for an ideal gas and the highest net work is achieved for the inlet pressure about 7.7MPa. Figure 1.1 Compressor and turbine work Another phenomenon of CO2 is a strong dependency of heat capacity on pressure and temperature (see Figure 1.2), therefore in certain condition a pinch point can occurs somewhere within the heat exchanger not just on the cold or hot end. Heat capacity plays an important role in design of heat exchangers. As “pinch point problem” is called a place where the minimum temperature difference is not satisfied (see Figure 1.3). In order to reach high cycle thermal efficiency detailed analysis of heat exchanger is necessary to prevent the pinch point problem.PDF Image | 2009 TECHNOLOGY INNOVATION WINNERS
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