Performance evaluation of delta-nabla channel configuration in a solar absorber with thermal energy storage

Farooq Khan, Taqi Ahmad Cheema, Muhammad Hasnain Tariq, Ahmad Abbas, Khuram Pervez Amber, Cheol Woo Park

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A novel configuration of solar absorber containing water channels of triangular cross-section in a delta-nabla arrangement, has been experimentally investigated. Traditionally, the triangular channeled solar absorbers are in use for space heating, but their effectiveness in solar water heating systems is yet to be explored. In addition to the performance investigation of the absorber, the effect of an integrated phase change material (PCM) based thermal energy storage (TES) has also been examined under solar and off-solar conditions. The highest temperature of 80 °C is obtained on the right side of the absorber containing hot water outlet in contrast to the left side where the cold-water inlet is located. Moreover, the average temperature gradient exists along the surface normal from the channel contours to the outside glazing. Integration of paraffin-based TES provides 62 L of water above 30 °C during off solar conditions. The efficiency of TES increases with smaller delays after charging and for higher flow rates because of reduced heat losses from the storage to the atmosphere. A delta-nabla configuration comparison with a conventional flat plate type solar absorber shows a prominent improvement in the overall performance.

Original languageEnglish
Article number107355
JournalJournal of Energy Storage
Volume65
DOIs
StatePublished - 15 Aug 2023

Keywords

  • Domestic water heating system
  • Phase change material
  • Solar water absorber
  • Thermal energy storage
  • Thermal performance

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