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Salinity gradient solar pond: Validation and simulation model
Bernad, Francesc; Casas Garriga, Sandra; Gibert Agulló, Oriol; Akbarzadeh, Aliakbar; Cortina Pallás, José Luís; Valderrama Angel, César Alberto
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
This paper describes the development, validation and use of a design and simulation tool for modeling the performance of a salinity gradient solar pond. An experimental solar pond pilot plant was constructed in central Catalonia (NE part of the Iberian Peninsula). The body of the pond is a cylindrical reinforced concrete tank, with 3 m height, 8 m diameter and total area of 50 m2. The lateral tank wall has been insulated with 60 mm of rock wool. The gradient in the solar pond was settled and maintained since 30 September 2009 to date. The developed tool was validated by comparing simulation results to experimental data collected from the experimental solar pond from November 2009 until August 2011. The resulting first-order differential equations describing the overall energy balance in the pond were solved numerically using a finite-difference method. The temperature profiles of the pond were properly described, especially at lower subzones of the non-convective zone (NCZ) and the lower convective zone (LCZ). The higher errors between experimental and predicted values were found in the upper convective zone (UCZ). Once validated, successfully, the model was used to predict the thermal performance of pre-industrial solar pond to be constructed and operated in Granada, SW of Spain. The thermal profiles predicted temperature differences between surface and bottom of around 40 °C during summer time, with a maximum temperature of 75 °C. The energy efficiency of the LCZ was anticipated to range between 12% and 25% along one year operation, resulting in 16% of incoming radiation to be extractable for site application.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria química::Química del medi ambient
Solar energy
Renewable energy
Solar ponds
Finite difference numerical solution
Heat storage
Numerical prediction tool
Renewable energy
Solar energy
Solar pond pilot plant
Energia solar
Energies renovables
Estanys solars
Attribution-NonCommercial-NoDerivs 3.0 Spain
Article - Draft

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