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

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Sayantan Ganguly ◽  
Abhijit Date ◽  
Aliakbar Akbarzadeh
Keyword(s):  
Thermal Performance ◽  
Heat Removal ◽  
External Source ◽  
External Heat ◽  
Heat Extraction ◽  
Heat Addition ◽  
Solar Pond ◽  
Heat Demand ◽  
External Sources ◽  
Evacuated Tube

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.

Effectiveness of Bottom Insulation of a Salinity Gradient Solar Pond

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Sayantan Ganguly ◽  
Abhijit Date ◽  
Aliakbar Akbarzadeh
Keyword(s):  
Temperature Distribution ◽  
Heat Loss ◽  
Thermal Performance ◽  
Salinity Gradient ◽  
Heat Removal ◽  
Optimum Thickness ◽  
Solar Pond ◽  
Before And After ◽  
Selection Of

This technical brief presents a study on the effectiveness of the bottom insulation of a salinity gradient solar pond (SGSP) in Melbourne, Australia. Insulation is applied at the bottom of a SGSP in order to minimize the heat loss from the SGSP to the ground underneath. But selection of optimum thickness of the insulation to extract the best thermal performance of an SGSP is a challenge as insulation involves significant investment. Hence, modeling heat loss from SGSP to the ground before and after applying the insulation is thus very essential. In this study, a layer of polystyrene is used as insulation at the bottom of SGSP. The temperature distribution in the SGSP and ground below it, the efficiency of the SGSP and the heat removal from SGSP are estimated for the SGSP without insulation and with insulation of different thicknesses. The results show that the insulation definitely reduces the heat loss from the SGSP to the ground, but to a certain extent. Insulation beyond a certain thickness is proved to be ineffective in increasing the efficiency or reducing the heat loss to ground and thus unable to enhance the thermal performance of the SGSP.

Thermal performance of shallow solar pond under open and closed cycle modes of heat extraction

Solar Energy ◽  
2013 ◽  
Vol 95 ◽  
pp. 30-41 ◽  
Author(s):  
A.A. El-Sebaii ◽  
S. Aboul-Enein ◽  
M.R.I. Ramadan ◽  
A.M. Khallaf
Keyword(s):  
Thermal Performance ◽  
Heat Extraction ◽  
Closed Cycle ◽  
Solar Pond

Thermal performance of shallow solar pond under open cycle continuous flow heating mode for heat extraction

2006 ◽  
Vol 47 (7-8) ◽  
pp. 1014-1031 ◽  
Author(s):  
A.A. El-Sebaii ◽  
S. Aboul-Enein ◽  
M.R.I. Ramadan ◽  
A.M. Khallaf
Keyword(s):  
Thermal Performance ◽  
Continuous Flow ◽  
Heat Extraction ◽  
Solar Pond ◽  
Open Cycle ◽  
Heating Mode

Inverse Optimization of Design Parameters in a Hybrid Solar Pond System With External Heat Addition

2019 ◽  
Author(s):  
Abhishek Kumar ◽  
Ranjan Das
Keyword(s):  
Solar Radiation ◽  
El Paso ◽  
Global Solar Radiation ◽  
External Heat ◽  
Forward Model ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Heat Addition ◽  
Model Based ◽  
Solar Pond

Abstract External heat supply to solar ponds from various types of solar collectors is a feasible alternative that significantly enhances its performance. In this work, various design parameters in a hybrid solar pond with external heat addition from Evacuated Tube Solar Collector (ETSC) are evaluated using an inverse approach. A forward model based on heat balance equations is solved for various zones of the solar pond to predict temperatures attained by its storage zone under a given climatic condition. Bryant and Colbeck’s relation is used to account for the diminution of the solar radiation as it travels from upper layers of the solar pond to its bottom layers. The relevant differential equations are solved using a Runge-Kutta fourth order scheme. The component of heat addition from ETSC is added to the forward model in the storage zone’s equation. Heat added from ETSC is considered proportional to the fraction of the aperture area to the pond’s base area, the thermal efficiency of ETSC and global solar radiation incident on ETSC. Both the forward model of the solar pond and combined solar pond and ETSC model were validated with previous experimental and numerical studies available in the literature for El Paso, USA, and Melbourne, Australia. An inverse model based on genetic algorithm is proposed for evaluating the set of geometrical parameters of ETSC and solar pond in order to derive a required performance from the combined solar pond-ETSC system.

Thermal Performance Enhancement of a Shallow Solar Pond Based on Nanofluids

2020 ◽  
Vol 12 (1) ◽  
pp. 01016-1-01016-5
Author(s):  
A. Terfai ◽  
◽  
Y. Chiba ◽  
M. N. Bouaziz ◽  
◽  
...  
Keyword(s):  
Thermal Performance ◽  
Performance Enhancement ◽  
Solar Pond
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