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ICTAMDMES'20 IOP Publishing IOP Conf. Series: Materials Science and Engineering 923 (2020) 012066 doi:10.1088/1757-899X/923/1/012066 4.2 Hot Water Supply Tank for Charging The hot water supply tank is located at top of thermal storage device in order to avoid pumping. An electric heater is installed in the hot water tank to heat the water and maintain the water temperature. This tank serves as a source of heat which is like solar water heating system. The main reason for using the electric heater is to simulate the process of solar heater in order to maintain constant temperature of hot water. It also incorporated with control valves and thermocouple to regulate and measure the hot water temperature. 4.3 Cold Water Supply Tank for Discharging The cold-water supply tank is located at the bottom of thermal storage device to enable the entry of cold water at bottom of thermal storage tank. The cold water takes the heat energy stored by the PCM and leaves at top. A pump is used to circulate the cold water through the PCM storage tank. 4.4 Pump A centrifugal pump of small discharge is used to pump the cold water from cold water tank to thermal storage tank. 4.5 Control Valves Spherical ball type control valves of 12 mm size are used to regulate the hot and cold-water entry and exit. 4.6 Flexible Hoses Flexible hoses are used to carry the water from hot and cold-water tank to thermal storage tank. 4.7 Thermocouple There are 6 number of T type thermocouple used to obtain temperature values. These thermocouples are connected to a six-channel temperature indicator to get digital output. 5. Experimental Procedure The experimental procedure consists of the following four steps 1. Charging 2. Draining the hot water 3. Discharging 4. Temperature data acquisition 5.1 Charging The electric heater provided in the hot water tank is switched on and the temperature of hot water is observed. When the temperature reaches to a predetermined level, the control valves are opened, and the water is allowed to enter into the thermal storage tank. This hot water increases the temperature of PCM and then melts it. The charging process continues until the PCM attains a steady state. 5.2 Draining the Hot Water The hot water available in the thermal storage tank is drained so that the storage tank is ready for discharging process. 5.3 Discharging The cold water available in the cold-water tank is pumped into thermal storage tank. The heat energy stored in PCM is released and this heat is absorbed by the cold water and hence the cold-water temperature rises. The discharging process continues until the PCM reaches to its original temperature. 5PDF Image | Thermal Energy Storage using Paraffin Wax Phase Change Materials
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