Abstract
The extraction of water from atmospheric air is a beneficial solution to solve the crisis of freshwater shortage. The usage of desiccant material to absorb water vapor from ambient air during the nighttime, followed by regeneration using a heat source during the daytime, is getting increased attention nowadays to produce potable water. In this study, the usage of short cylinder-type receiver along with a 16-m2 Scheffler-type solar concentrator system is experimented as a heat source for regeneration purpose. Silica gel is used as the desiccant material for performing the experiments. Tests are conducted on different radiation conditions to assess water extraction possibilities of the solar dish-receiver system. The experiment shows a maximum adsorption capacity of the silica gel as 0.25 g g−1 at a temperature of 25 °C and relative humidity of 80%. The results reveal that for the average beam radiation of 624 W m−2, the maximum receiver temperature is 132 °C and the corresponding water collection is 105 mL kg−1 of silica gel in a day with a total system efficiency of 10.9%. For a low value of average beam radiation of 370 W m−2, the maximum receiver temperature is observed as 109 °C and its corresponding water extraction is 64 mL kg−1 of silica gel in a day with a total system efficiency of 11.3%. The possible ways for performance enhancement of the system for increased yield are also presented. This system has the potential to be employed in the temperature range 30–340 °C, especially in remote and decentralized areas where there is no electricity.
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The authors declare that all the data supporting the findings of this study are available within the article.
Abbreviations
- \(A_{{{\text{ap}}}}\) :
-
Effective aperture area of reflector dish (m2)
- \(A_{{\text{f}}}\) :
-
Surface area of the elliptical frame of reflector dish (m2)
- \(A_{{\text{R}}}\) :
-
Aperture area of receiver (m2)
- \(I_{{\text{b}}}\) :
-
Solar beam radiation (W m−2)
- \(I_{{{\text{b}},{\text{t}}}}\) :
-
Total solar beam radiation (kJ m−2)
- \(Q_{{\text{D}}}\) :
-
Concentrated solar radiation power or dish power (kW)
- \(Q_{{\text{L}}}\) :
-
Overall rate of heat loss (kW)
- \(Q_{{\text{R}}}\) :
-
Receiver power (kW)
- \(Q_{{\text{S}}}\) :
-
Solar radiation power on the reflector dish (kW)
- \(m_{{\text{w}}}\) :
-
Mass of water evaporated (kg)
- L :
-
Latent heat of water at average bed temperature (kJ kg−1)
- \(\delta_{{\text{i}}}\) :
-
Solar declination angle (°)
- \(\eta_{{{\text{opt}}}}\) :
-
Combined optical efficiency of reflector dish (%)
- \(a\) :
-
Semi-minor axis of the elliptical frame of reflector dish (m)
- \(b\) :
-
Semi-major axis of the elliptical frame of reflector dish (m)
- \(n\) :
-
Day of the year
- A :
-
Initial cost of the system
- S :
-
Salvage value
- n :
-
Useful life of the system
- i :
-
Annual interest rate
- CRF:
-
Capital recovery factor
- SFF:
-
Sinking fund factor
- INR:
-
Indian rupees
- TGA:
-
Thermogravimetric analysis
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Acknowledgements
The authors like to thank the management of SRM Institute of Science and Technology, Kattankulathur, for the support and encouragement for carrying out this research work. The authors also like to thank the organizing committee of ICAME 2020 for motivation and support.
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Avipsita Das conceived the study. Avipsita Das, Rohan Sharma, and V. Thirunavukkarasu developed the experimental setup under the supervision of M. Cheralathan. Avipsita Das and Rohan Sharma carried out the experiments and data analysis under the supervision of V. Thirunavukkarasu and M. Cheralathan. V. Thirunavukkarasu, Avipsita Das, and Rohan Sharma wrote the manuscript with the inputs of all authors.
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Das, A., Sharma, R., Thirunavukkarasu, V. et al. Desiccant-based water production from humid air using concentrated solar energy. J Therm Anal Calorim 147, 2641–2651 (2022). https://doi.org/10.1007/s10973-021-10558-z
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DOI: https://doi.org/10.1007/s10973-021-10558-z