Encapsulation surface roughness effect on the performance of cool storage systems

Ahmed Altohamy, Ismail Elsemary*, Saber Ragab Abdallah, M. A. Adbelrahman, Ahmed Attia, R. Y. Sakr

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
86 Downloads (Pure)


Cool Storage is a well-known technique that been used to increase the energy efficiency of cooling systems. This paper represents a novel experimental work for the effect of internal capsules surface roughness on the performance of encapsulated cool storage systems. In this study, distilled water was used as a phase change material inside capsules. Internal surface roughness of 0, 3, 7 and 12 μm were tested using the same heat transfer fluid Characteristics. Heat transfer fluid (HTF) composed of 50–50 wt. of (water–ethylene glycol) was used with a fixed volume flow rate of 12 L/min LPM and four different inlet temperatures of −6, −8, −10 and −12 C. The solidified mass fraction, charging rate and energy storage were calculated and plotted versus the charging time to determine the surface roughness effect on the cooling performance of the system. Results showed that the internal surface roughness of capsules had adverse effect on the system performance through increasing the total freezing (charging) time. Results also indicated that the charging time increased by 14–17% at inlet flow temperature of −12 and −6 ̊C, respectively at the higher roughness values compared with the smooth surface capsule e.g. zero roughness parameter.

Original languageEnglish
Article number101279
JournalJournal of Energy Storage
Early online date20 Feb 2020
Publication statusPublished - 1 Apr 2020


  • Cool storage
  • Surface roughness
  • Solidification
  • PCM


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