Influence of the location of discrete macro-encapsulated thermal energy storage on the performance of a double pass solar plate collector system

K. R. Arun, M. Srinivas, Ahamed Saleel Chandu Veetil, S. Jayaraj

Research output: Contribution to journalJournal articlepeer-review

16 Scopus citations

Abstract

In this work, an outdoor experimental analysis is conducted to determine the impact on the useful heat gain when discrete cylindrical energy storage units are directly integrated into the solar collector. The collector has a double-pass airflow channel pathway, and the storage is intended to serve only for a short-term. The location of storage inside the collector is always a major concern. This study seeks to determine whether the thermodynamic performance of the system is effective by the location of cylindrical energy storage (paraffin wax) capsules on the upper or the lower airflow channel pathway. The obtained results suggest that due to asymmetric channel depth, the thermodynamic performance of the collector was not greatly influenced by the placement of capsules, unlike with symmetric channel depths. The amount of useful heat gain when storage was placed in the upper (Case A) and lower (Case B) airflow pathways was 0.35 kW and 0.4 kW. For Case A and Case B, the average collector thermal efficiency was 62.9% and 73.7%, and the exergy efficiency was 44.3% and 47.5%. The energy payback time for the collector based on energy calculations is nine months, and that on exergy analysis is 34 months and 20 days.

Original languageEnglish
Pages (from-to)675-686
Number of pages12
JournalRenewable Energy
Volume146
DOIs
StatePublished - Feb 2020

Keywords

  • Energy storage
  • Macro-encapsulation
  • Paraffin wax
  • Solar collector

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