THERMAL ENERGY STORAGE USING PARAFFIN WAX

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THERMAL ENERGY STORAGE USING PARAFFIN WAX ( thermal-energy-storage-using-paraffin-wax )

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provides EG-water as HTF at desired temperatures for both charging and discharging. The outlet of the thermal bath is connected to a three-way ball valve which allows for adjustment of the flow rate of the HTF. The flow rate of the HTF is monitored using a flow meter connected to the inlet line of the storage unit. The excess amount of HTF is directed back to the thermal bath through a bypass line. The outlet pipe connected to the top of the storage merges with the bypass line going back to the thermal bath. The thermocouples and flow meter were connected to the DAQ system to record measured data on the computer. Six T-type thermocouples were used for tracking the temperature profile within the storage unit. Three thermocouples were located at three different heights in the center of the container while two thermocouples were used for monitoring the inlet and outlet HTF temperature (Figure 3.2-(b)). The bottom thermocouple was positioned 2.22 cm (0.875 in) above the bottom plate in the center. The middle thermocouple was attached to the same rod as the bottom center thermocouple at 17.46 cm (6.875 in) height. The top thermocouple was placed just an inch (2.54 cm) above the middle thermocouple due to significant shrinkage upon solidification. The last thermocouple was also inserted at the same height as the bottom center thermocouple but 6.35 cm apart from it to measure the radial temperature difference. The thermocouples were calibrated by comparing the measured values with the pre-manufactured thermocouple’s measurements. The uncertainty was found to be ±1 °C, which is acceptable for this experimental study. 36

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