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CHAPTER 2: LITERA TURE STUDY is negligible because it is actually smaller than for conventional refrigerants. This leads to the possibility of designing compressors with a relatively larger efficiency than for conventional refrigerants. Figure 2.9: Slope of saturation pressure curve for different refrigerants. (Kim et ai, 2003). o -40 -20 o 20 40 T f'cl 60 100 The density of CO2 changes drastically near its critical point as a function of temperature and the density ratio is much less than for conventional refrigerants giving it a more homogenous two-phase flow. The above-mentioned is shown in figure 2.10. The density of CO2 in its gas phase can be very large, approaching or even exceeding the density of water in its liquid phase (Freund, s.a.). The high vapour density of CO2 gives it its unique high volumetric refrigeration capacity. The volumetric refrigeration capacity of CO2 increases as the temperature increases, but reaches a maximum at 20°C and then starts to decrease again (Kim et al., 2003). This is shown in Figure 2.11. A Techno-Economical Analysis of a COl Heat Pump. School of Mechanical Engineering, North-West University --R'-12 H-134PDF Image | CO2 HEAT PUMP Analysis
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