Study the Performance of Nano-Enhanced Phase Change Material NEPCM in Packed Bed Thermal Energy Storage System
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International Journal of Engineering Trends and Technology (IJETT) |  |
| © 2016 by IJETT Journal | ||
| Volume-37 Number-2 |
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| Year of Publication : 2016 | ||
| Authors : Lubna A. Naeem, Tahseen A. Al-Hattab, Majid I. Abdulwahab |
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| DOI : 10.14445/22315381/IJETT-V37P213 |
Citation
Lubna A. Naeem, Tahseen A. Al-Hattab, Majid I. Abdulwahab"Study the Performance of Nano-Enhanced Phase Change Material NEPCM in Packed Bed Thermal Energy Storage System", International Journal of Engineering Trends and Technology (IJETT), V37(2),72-79 July 2016. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Abstract
The present work deals with an experimental investigation of charging and discharging processes in thermal storage system using a Nano-Enhanced phase change material (NEPCM). Paraffin wax was used as the phase change material, and nanoparticles of Cu and TiO2 used with (1%, 2%, 3%, and 5%) additive by weight that were added to melt paraffin wax and mixed with shear mixer to avoid the formation of aggregation and to form suitable NEPCM. Then, it was put in spherical capsules and packed in a cylindrical packed column which acted as an energy storage system. Air was used as the heat transfer fluid (HTF) in thermal storage unit. The effect of HTF flow rate and nanoparticles concentration on the time of charging and discharging process and on temperature hysteresis were studied. The results showed that the faster storage of thermal energy can be made by high flow rate of heat transfer fluid (HTF) and high concentration of nanoparticles. But it was found that at 65°C HTF inlet temperature, the melting and solidification processes higher accelerated at 3% weight fraction of nanoparticles than that at 1% concentration. Also, when the flow rate was increased from 9 to 24 L/s. the temperature hysteresis increases, but when the concentration of nanoparticles increase; the temperature hysteresis decrease.
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Keywords
Nano-enhanced phase change material NEPCM; paraffin wax; TiO2; Cu; heat transfer fluid HTF; thermal energy storage TES.