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39 Table 3-3. Comparison between the size of water and PCM storage. Storage: 411kWh = 1479600kJ Water PCM (RT-60) Heat Capacity Mass Density Volume 4.186 kJ/kg-K 35346 kg 983.2kg/m3 35.95 m3 144 kJ/kg 10275 kg 770 kg/m3 13.34m3 Paraffin waxes can be designed to be utilized in various geometries. One effective storage module is discussed in by Agyenim & Hewitt (2012). It consists of a horizontally mounted cylindrical storage shell containing Paraffin wax. A copper tube with longitudnal fins welded on the surface is placed in the center through which water to be heated passes. The fins are required to improve the heat transfer characteristics since paraffin wax has a low thermal conductivity (0.2W/m-K). A similar geometry will be beneficial in the sytem being discussed in this thesis. From, the above size comparision PCMs prove to be a better option. However, economic analysis is required to make an appropriate decision which is discussed in Chapter 5.PDF Image | CO2 HEAT PUMPS FOR COMMERCIAL BUILDING APPLICATIONS
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