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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rate between the heat transfer fluid and PCM is desired. Therefore, the heat exchanger type plays a crucial role in the design of thermal storage units. Maximized contact area between the PCM and heat exchanger surface is required due to the poor heat transfer performance of the PCM. Another factor to be considered in the design is the pressure drop developed from frictional losses through the heat exchanger. The optimal design will aim to limit the local pressure drop while not compromising the device’s performance. Among the several heat exchanger designs, the helical coil configuration stands out due to the increased heat transfer surface area. Therefore, some of the researchers chose to use a helical coil design in their studies (Huang et al., 2011; Kabbara et al., 2014; Korti & Tlemsani, 2016; Sundaram et al., 2016; Dinker et al., 2016; Tayssir et al., 2016; Zhang et al., 2017; Yang et al., 2017). The types of experimental setups vary depending on the energy sources. The majority of experimental studies used thermal baths to provide the desired operational conditions (Korti & Tlemsani, 2016; Dinker et al., 2016; Tayssir et al., 2016; Zhang et al., 2017). Yet, other studies utilized solar energy through solar panels to perform real-time charging/discharging tests (Kabbara et al., 2014; Yang et al., 2017). Thermocouples are usually placed in the storage unit at various locations and data are recorded through data acquisition (DAQ) systems. In terms of the geometry of the storage unit, vertical cylindrical containers are widely preferred (Huang et al., 2011; Kabbara et al., 2014; Korti & Tlemsani, 2016; Dinker et al., 2016; Tayssir et al., 2016; Zhang et al., 2017; Yang et al., 2017). There are also studies that have used horizontal cylindrical (Sundaram et al., 2016) and rectangular containers (Dinker et al., 2017). 7

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