Technical Brief

Investigation of Thermal Performance of a Solar Pond With External Heat Addition

[+] Author and Article Information
Sayantan Ganguly

Environmental Hydrogeology Group,
Department of Earth Sciences,
Utrecht University,
Princetonplein 9,
Utrecht 3584CC, The Netherlands
e-mail: s.ganguly@uu.nl

Abhijit Date

Energy Conservation and Renewable Energy Group,
School of Engineering,
RMIT University,
P.O. Box 71,
Bundoora 3083, Victoria, Australia
e-mail: abhijit.date@rmit.edu.au

Aliakbar Akbarzadeh

Energy Conservation and Renewable Energy Group,
School of Engineering,
RMIT University,
P.O. Box 71,
Bundoora 3083, Victoria, Australia
e-mail: aliakbar.akbarzadeh@rmit.edu.au

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received September 8, 2017; final manuscript received November 7, 2017; published online January 22, 2018. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 140(2), 024501 (Jan 22, 2018) (6 pages) Paper No: SOL-17-1372; doi: 10.1115/1.4038788 History: Received September 08, 2017; Revised November 07, 2017

This study addresses the method of adding heat to a salt gradient solar pond (SGSP) from external sources and investigates the thermal performance of the pond. In this case, the external heat source is solar heat collected by evacuated tube solar collectors (ETSC), and collected heat is transferred to the lower-convective zone (LCZ) of the SGSP by circulating fluid from the LCZ. Results show that heat addition from the external source enhances the thermal performance of the SGSP in terms of heat recovery and thermal efficiency but with certain constraints. The heat addition efficiency reduces with increase in aperture area of the ETSC. Also with increasing heat addition, the heat removal from the SGSP has to be increased; otherwise, the SGSP efficiency reduces rapidly. Heat removal from SGSP has to be performed keeping in mind the heat demand and the quality of heat. The latter reduces with an increase of heat extraction beyond a certain limit. Hence, optimizing the range of parameters in case of adding heat from external sources is very important for the best performance of a SGSP.

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Grahic Jump Location
Fig. 1

Schematic diagram of the hybrid system of salinity gradient solar pond coupled with ETSCs

Grahic Jump Location
Fig. 2

Schematic diagram showing the different zones and boundaries of SGSP with the numerical grid

Grahic Jump Location
Fig. 3

Monthly average of daily solar radiation on a horizontal surface and monthly average temperature in Melbourne

Grahic Jump Location
Fig. 4

Temperature development of the solar pond in Melbourne for different R values and for HEFF equal to (a) 0.0002 kg/m2/s, (b) 0.00025 kg/m2/s, and (c) 0.0003 kg/m2/s

Grahic Jump Location
Fig. 5

Heat removal from LCZ and instantaneous efficiency of the SGSP for different R values and different HEFF through LCZ

Grahic Jump Location
Fig. 6

The thermal efficiency of the ETSC and the heat addition from the ETSC to LCZ for different R values and different heat extraction from LCZ




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