Experimental charging and discharging performance of alumina enhanced pentaerythritol using a shell and tube TES system. (November 2019)

• Record Type: Journal Article
• Authors: Venkitaraj, K.P.; Suresh, S.; Praveen, B.
• Is Part Of: Sustainable cities and society. Volume 51(2020)
• Publication Date: 2019-11
• Subjects: PCM phase change material -- HTF heat transfer fluid -- PE pentaerythritol -- DSC Differential Scanning Calorimetry -- LPM liter per minute -- TES thermal energy storage -- SSPCM solid–solid PCM -- TEM transmission electron microscope -- SEM scanning electron microscope -- XRD X-ray diffraction -- EDX Energy Dispersive X-ray -- FESEM field emission scanning electron microscope; Pentaerythritol -- Solid–solid PCM -- Al2O3 nanoparticles -- Charging and discharging -- Energy efficiency -- Exergy efficiency; Sustainable urban development -- Periodicals; Sustainable buildings -- Periodicals; Urban ecology (Sociology) -- Periodicals; 307.76
• DOI: 10.1016/j.scs.2019.101767
• Languages: English
• ISSNs: 2210-6707

Abstract

Highlights: Shell and tube type TES system using nano alumina enhanced solid–solid PCM for energy storage. Pentaerythritol (PE) blended with Al2 O3 nanoparticles as solid–solid PCM. Charging and discharging efficiencies increased by 22.2% and 22.4% respectively by adding 1.0 wt.% Al2 O3 to PE. Enhancement of about 20.2% in overall efficiency by using PE + 1.0 wt.% Al2 O3 . Exergy analysis of PE based shell and tube TES. Abstract: The work presented in this paper is the results of an experimental study conducted on the thermal energy storage (TES) performance of pentaerythritol (PE) added with alumina (Al2 O3 ) nanoparticles. The charging and discharging experiments are performed using PE added with 0.5 and 1.0 wt.% of Al2 O3 in a shell and tube type thermal energy storage system. The experimental data are analyzed to obtain the charging/discharging efficiencies and the overall efficiency of the TES system at different flow rates 2, 4, 6 LPM of the heat transfer fluid (HTF, Therminol-55). Exergy analysis based on the 2nd law of thermodynamics is also carried out in this experimental work. The results indicated that charging and discharging time is reduced due to the addition of Al2 O3 with PE at all volume flow rates of HTF. The maximum charging and discharging powers of 289.3 W and 230.8 W respectively are observed in the case of PE + 1.0% Al2 O3 corresponding to the flow rate of 6 LPM. The efficiencies of charging and discharging showed maximum values of 86.8% and 75.0% respectively at 6 LPM. The overall energy efficiency of the thermal energy storage system found increased from 38.3% obtained in the case of PE to 50.5% and 58.5% obtained for PE added with 0.5 wt.% and 1.0 wt.% of Al2 O3 nanoparticles respectively.