Abstract
In this chapter, thermal energy storage performances of different models of insulated solar pond are analyzed. Solar ponds were built on the ground in cylindrical and rectangular types. The cylindrical solar pond has a surface area of 2.0096 m2 and a depth of 1.90 m. The rectangular shaped solar pond has a surface area of 4 m2 and a depth of 1.5 m. The thicknesses of the heat storage zones (HSZ) of the cylindrical and rectangular model solar ponds are determined as 80 and 90 cm, respectively. Similarly, the thicknesses of the non-convection zones (NCZ) called the thermal insulation one are 60 and 80 cm, and the thicknesses of the upper convective zone (UCZ) were 10 and 20 cm. Thus, thanks to three different regions of the solar pond (HSZ, NCZ and UCZ), the sun rays pass through UCZ and NCZ and are absorbed in the storage area and stored in the form of heat. Thus, heat loss of the thermal energy stored in the HSZ is significantly reduced thanks to the non-convection zone (NCZ) and sidewall insulations. Thus, the storage performance of the solar pond has been improved. Temperature distributions throughout the layers of the ponds are measured experimentally. Thus, energy storage performances of solar ponds have been calculated. As a result, it is seen that much more thermal energy can be stored with the increase in the surface area rather than the shape of the pond. Moreover, industrial process water can be produced and stored at low temperatures from solar energy. Consequently, it has been observed that solar ponds are one of the important renewable energy systems for thermal energy storage.
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Abbreviations
- A :
-
Surface area (m2)
- CSP:
-
Cylindrical solar pond
- E :
-
Heat energy
- F :
-
Absorbed energy fraction at a region of
- h :
-
Solar radiation ratio
- HSZ:
-
Heat storage zone
- \(\dot{I}\) :
-
Incident solar radiation (W/m2)
- k :
-
Thermal conductivity (J m−1 °C−1)
- L:
-
Width of the RSP
- n :
-
Refractive index
- NCZ:
-
Non-convection zone
- UCZ:
-
Upper convective zone
- Q :
-
Heat energy
- r:
-
Inner radius of the CSP
- R:
-
Thermal resistance of the side-walls (°C/J)
- RSP:
-
Rectangular solar pond
- T :
-
Temperature (℃ or K)
- X :
-
Thickness of inner zones (m)
- η :
-
Efficiency
- Δ :
-
Difference
- δ :
-
Thickness where long-wave solar energy is absorbed (m)
- θ :
-
Angle (rad)
- Δx :
-
Thickness of horizontal layers (mm)
- a:
-
Ambient
- b:
-
Bottom
- dw:
-
Down
- in:
-
Input
- L:
-
Layer
- m:
-
Mean
- out:
-
Output
- p:
-
Paint-wall
- ps:
-
Painted metal sheet for first layer
- r:
-
Reflection
- s:
-
Sheet-iron thickness (mm)
- salt,w:
-
Salty water
- sol:
-
Solar
- st:
-
Stored
- sw:
-
Side wall
- p:
-
Paint-wall
- ps:
-
Painted metal sheet for first layer
- r:
-
Reflection
- up:
-
Just above zone
- w:
-
Width
- wa:
-
From water to air
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Acknowledgements
The authors are thankful to University of Cukurova for financial support of the present work (Grant No. FEF2004 BAP4, FEF2009D2, FEF2010BAP5 and FEF2013D32).
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Karakilcik, M., Atiz, A., Bozkurt, I., Erden, M., Cilogullari, M., Abhishek, S. (2022). Thermal Energy Storage Performance Analysis of Different Model Solar Ponds. In: Uyar, T.S., Javani, N. (eds) Renewable Energy Based Solutions. Lecture Notes in Energy, vol 87. Springer, Cham. https://doi.org/10.1007/978-3-031-05125-8_20
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