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CHAPTER 2: STUDY 30 necessary for heat transfer, smaller pipe sizes are required and its safety aspect is advantageous (Neksa al., 1998). By using CO2 in the transcritical high temperature side of a cascade system a large temperature glide can be attained with a low volume flow resulting in small pipe dimensions. Waste heat from the high temperature side could be implemented towards the use of tap water heating. According to Neksa et al. (1998), a comparison of a CO2 system and a conventional R-22 system has resulted in a decrease of up to 32% in energy consumption. The Coca Cola Company and McDonalds has also announced that CO2 as refrigerant is a good alternative to HFCs in the use of their systems (Neksa et a/., 1998). Figure 2.19 shows the principle diagram for a cascade system used in supermarket refrigeration (Danfoss, 2002b). Figure 2.19: Principle diagram CO2 cascade system with 2 temperature levels (Danfoss, 2002b). +30~ OX-system I -30 Q~C C02 In 2008 Australia implemented their first full CO2-based supermarket installation. The system was operated under the worst summer conditions in Australia having A Techno-Economical Analysis of a CO, Heat Pump. School ofMechanical Engineering, North-West University R717 , R404, R134a, ...PDF Image | CO2 HEAT PUMP Analysis
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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
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