TY - JOUR
T1 - Performance evaluation of delta-nabla channel configuration in a solar absorber with thermal energy storage
AU - Khan, Farooq
AU - Cheema, Taqi Ahmad
AU - Tariq, Muhammad Hasnain
AU - Abbas, Ahmad
AU - Amber, Khuram Pervez
AU - Park, Cheol Woo
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/8/15
Y1 - 2023/8/15
N2 - 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.
AB - 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.
KW - Domestic water heating system
KW - Phase change material
KW - Solar water absorber
KW - Thermal energy storage
KW - Thermal performance
UR - http://www.scopus.com/inward/record.url?scp=85152386129&partnerID=8YFLogxK
U2 - 10.1016/j.est.2023.107355
DO - 10.1016/j.est.2023.107355
M3 - Article
AN - SCOPUS:85152386129
SN - 2352-152X
VL - 65
JO - Journal of Energy Storage
JF - Journal of Energy Storage
M1 - 107355
ER -