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available PCMs, paraffin wax (RT 60) seems to be the best fit, taking into consideration its melting point temperature range. The properties of RT-60 provided by the manufacturer are listed in Appendix B. The melting temperature range of the TES is 55°C-61°C. This suites the application perfectly, since water is required for district heating at 62°C and the CO2 heat pump system can provide water at ~65°C. This is shown in the schematic diagram Figure 3-11. 38 65°C 62°C TES Melting range: 55°C - 61°C (RT 60) CO2 Heat Pump 55°C Figure 3-11. Schematic diagram of the system with PCM (RT-60) as the storage. The major advantages of using Paraffin waxes are: Four to five times higher heat capacity by volume or mass, than water, thus making them more compact. Non water endangering substances (if melting above 27 °C) 100 % recyclable. Neither toxic nor dangerous to health Table 3-3 gives a comparison between the size of water and PCM as storage for this application. PCM reduces the size of the storage by one-third. This is a significant decrease in the size and potentially an important factor since storage has to be placed inside a building in this application. However, Paraffin waxes are up to four times more expensive than water storage (He & Setterwall, 2002). 52°C Building Heating LoadPDF Image | CO2 HEAT PUMPS FOR COMMERCIAL BUILDING APPLICATIONS
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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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