Abstract
Solar still is one of the economic and eminent ways of desalinating the available sea/brackish water into potable water. However, the distillate output from the solar still is moderate and various researches are being conducted to improve the productivity of solar still. In this research, a novel bottom finned (solid and hollow) absorber basin is designed and developed to enhance the heat transfer between absorber and phase change material (PCM) which further improves the freshwater productivity from the solar still. The results of the investigation are compared with the conventional solar still. The three single-slope solar stills considered developed for evaluating the effect of modification on the freshwater productivity are (i) conventional solar still (CSS), (ii) solar still with hollow finned absorber inserted in energy storage (SSHFES), and (c) solar still with solid finned absorber inserted in energy storage (SSSFES). The investigation results reported that the SSHFES has greater productivity when compared with the SSSFES and CSS. The freshwater productivity from the SSHFES is 4085 mL/m2 day, whereas the freshwater productivity from SSSFES and CSS is 3485 mL/m2 day and 2885 mL/m2 day, respectively. The efficiency of SSHFES and SSSFES is increased by 41.67% and 20.81% relative to the CSS. It is observed from economic analysis that the cost per liter (CPL) freshwater produced by SSHFES, SSSFES and CSS is about ₹ 2.3 ($ 0.032), ₹ 2.5 ($ 0.034), and ₹2.6 ($ 0.036), respectively. The payback periods of SSHFES, SSSFES, and CSS is 6.3 months, 6.8 months, and 7.1 months, respectively. Also, the enviroeconomic analysis conferred that the carbon credit gained from the SSHFES is $189.28 whereas SSSFES and CSS gained only $158.2 and $132.02. Based on the current study, it is observed that the solar still with hollow finned absorber inserted in energy storage (SSHFES) is effective when compared to others and it is viable for potable water production at cheaper costs.
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Abbreviations
- CSS:
-
Conventional solar still
- SSHFES:
-
Solar still with hollow finned absorber inserted in energy storage
- SSSFES:
-
Solar still with solid finned absorber inserted in energy storage
- CPL:
-
Cost per liter
- CPVC:
-
Chlorinated polyvinylchloride
- PCM:
-
Phase change material
- FC :
-
First annual cost
- CF :
-
Capital recovery factor
- P :
-
Principal investment
- I :
-
Interest rate
- L :
-
The lifetime of solar still
- SF :
-
Annual savage factor
- FF :
-
Sinking fund factor
- S :
-
Salvage value
- MC :
-
Annual maintenance cost
- TC :
-
Total annual cost
- AY :
-
Average annual freshwater yield
- E in :
-
Embodied energy of the desalination setup
- E out :
-
Annual energy output
- M ew :
-
Annual freshwater yield
- λ fg :
-
Latent heat evaporation of water
- NCEM :
-
Net carbon dioxide mitigation
- CCG :
-
Carbon credit gained
- mL:
-
Milliliter
- Mm:
-
Millimeter
- Cm:
-
Centimeter
- M:
-
Meter
- W:
-
Watt
- kWh:
-
Kilowatt-hour
- °C :
-
Degree Celsius
- m w :
-
Mass of freshwater (yield)
- L w :
-
Latent heat of vaporization of water
- A :
-
Area of the absorber basin
- I :
-
Global solar radiation
- U :
-
Standard uncertainty
- u η :
-
Uncertainty of the efficiency
- u dw :
-
Uncertainty in instantaneous productivity
- d f :
-
Final instantaneous distillate output value
- d i :
-
Initial instantaneous hourly distillate output value
- u y :
-
Uncertainty of productivity measurement
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Subbarama Kousik Suraparaju: conceptualization, formal analysis, investigation, data curation, writing—original draft. Sendhil Kumar Natarajan: conceptualization, validation, resources, writing—review and editing, supervision, project administration.
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Suraparaju, S.K., Natarajan, S.K. Productivity enhancement of single-slope solar still with novel bottom finned absorber basin inserted in phase change material (PCM): techno-economic and enviro-economic analysis. Environ Sci Pollut Res 28, 45985–46006 (2021). https://doi.org/10.1007/s11356-021-13495-4
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DOI: https://doi.org/10.1007/s11356-021-13495-4
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