Heat Charging–Discharging Periods of Paraffin Wax

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Micromachines 2022, 13, 1456 4 of 10 Micromachines 2022, 13, x (a) 4 of (b) Figure 1. (a) Schematic of LHTES setup. (b) Schematic of fin arrangement. Figure 1. (a) Schematic of LHTES setup. (b) Schematic of fin arrangement. Table 3. Probe location. Table 4 presents the charging and discharging test parameters. The readings were recorded with an equal time interval of 15 min. Three trials were conducted under each Thermocouple Probe Probe Location testing condition to analyze the thermal behavior of the paraffin–steatite PCM. X-ray diffrac- T3, T6 T7, T10 150 mm from either side of the test section tion (XRD) analysis was used to determine the phases of the steatite. A scanning electron T4, T5,T8, T9 50 mm from either side of the test section microscope (SEM) (model JSM-6390LV, JEOL USA Inc., Peabody, MA, USA) equipped with an EDS was used to examine the microstructures of PCM composites. Table 4 presents the charging and discharging test parameters. The readings w recorded with an equal time interval of 15 min. Three trials were conducted under e Table 4. Experimental conditions during the charging and discharging cycles. testing condition to analyze the thermal behavior of the paraffin–steatite PCM. X- Condition Fluid Flow Rate diffraction (XRD) analysis was used to determine the phases of the steatite. A scann electron microscope (SEM) (model JSM-6390LV, JEOL USA Inc., Peabody, MA, U Discharging Hot fluid flow rate = 0.0055 kg/s Charging equipped with an EDS was used to examHiontefltuhide mtemicproersatrturcetu=r6e0s oCf PCM composites. Cold fluid flow rate = 0.0033 kg/s Cold fluid temperature = 30 ◦C Table 4. Experimental conditions during the charging and discharging cycles. ◦ 3. Results and Discussion 3.1. XRD Analysis Charging Condition Fluid Flow Rate Hot fluid flow rate = 0.0055 kg/s Hot fluid temperature = 60 °C Figure 2 depicts the XRD examinations of the steatite powder sample phase. Some Cold fluid flow rate = 0.0033 kg/s same phases were sDeeisnchinarthgeinXgRD analysis of steatite powders; these included the enstatite (JCPDS 86-0430), quartz (JCPDS 46-1045), and smectite families (JCPDS 13-0135). In an Cold fluid temperature = 30 °C e a r i S

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