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Use separated sheels ) puptr 2. A family installed a solar panel with an area of 4 m2. If the average output power density during the day is 120 W/ during the day is 120 W/m: how much clectric energy can this solar panel generate in a l day? (10) 0-hr The family plans to use a PCM (phase change material) based technology to store this energy Assume there is no energy loss from electrical to thermal energy conversion, how much PCM is needed? Use the following data (20 pt). Working temperature range: -20°C-90°C Solid: density 0.9 g/cm, heat capacity 2.5 J/g-C Liquid: density 0.99 g/cm. heat capacity 4.18 Jlg- C Melting point 50°C, heat of fusion 210 J/g

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