Increasing the storage capacity of a solar pond by using solar thermal collectors: Heat extraction and heat supply processes using in-pond heat exchangers

Alcaraz, A, Montala, M, Valderrama, C, Cortina, J, Akbarzadeh, A and Farran, A 2018, 'Increasing the storage capacity of a solar pond by using solar thermal collectors: Heat extraction and heat supply processes using in-pond heat exchangers', Solar Energy, vol. 171, pp. 112-121.


Document type: Journal Article
Collection: Journal Articles

Title Increasing the storage capacity of a solar pond by using solar thermal collectors: Heat extraction and heat supply processes using in-pond heat exchangers
Author(s) Alcaraz, A
Montala, M
Valderrama, C
Cortina, J
Akbarzadeh, A
Farran, A
Year 2018
Journal name Solar Energy
Volume number 171
Start page 112
End page 121
Total pages 10
Publisher Elsevier
Abstract In this study, an experimental investigation of the performance of a salinity gradient solar pond (SGSP) integrating solar collectors is presented. The SGSP is located in Barcelona (Spain) and has a cylindrical tank 3 m in height and 8 m in diameter with a total area of 50 m2. For this purpose, four solar thermal collectors (10 m2) are integrated, as an external source of heat, with the solar pond pilot plant in order to increase the storage capacity and its overall efficiency. The aim of this study is to evaluate heat extraction and heat supply processes from and to the SGSP under different seasonal conditions. Two in-pond heat exchangers are used, a conventional one situated on the bottom of the pond and a second one covering the lateral wall area of the pond. Heat extraction and supply experiments are performed using both heat exchangers individually or both at the same time. The experiments are conducted under two different seasonal temperature conditions: winter (February and March) and summer (July). The variations of the temperature inside the pond during the heat extraction/supply tests are monitored and analyzed. The results have indicated that the use of solar collectors as an extra source of heat for the solar pond led to a 50% increase in the daily efficiency during the cold season tests, while heat extraction only appeared as the best option during the warm season tests. Higher daily efficiency and heat supply results can only be obtained if large amounts of heat are extracted, otherwise, the daily efficiency of the solar pond could decrease. Finally, the solar collectors can be considered a good alternative for avoiding a significant decrease in solar pond temperatures (especially during the cold season), which would not only result in a significant energy storage efficiency improvement but also increase the capacity of the solar pond to supply heat to an external application.
Subject Built Environment and Design not elsewhere classified
Engineering not elsewhere classified
Keyword(s) Efficiency
Energy storage
Heat extraction/supply
Pilot plant
Salinity gradient solar pond
Solar collectors
Solar radiation
DOI - identifier 10.1016/j.solener.2018.06.061
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0038-092X
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