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ABSTRACT
Performance testing of floating wick basin type vertical multiple effect diffusion solar still with waste heat recovery (FW-BVMED-HR) was done, under outdoor conditions. The cumulative efficiency of the four effect FW-BVMED-HR increases by 33%, when the gap between partition plates is decreased from 16 mm to 10 mm. The cumulative efficiency decreases by 27% as the feed rate increases from 0.27 g/m2/s to 0.38 g/m2/s. Increase of basin water depth had little effect on the cumulative efficiency of the still. The cumulative efficiency increased by 58% when the number of effects was increased from 2 to 7.
Nomenclature
| Ag | = | Area of glass cover, m2 |
| d | = | Depth of basin water, cm |
| f | = | Feed water flow rate per unit area of the partition plate, g/m2/s |
| Gg | = | Global solar radiation on glass cover, W/m2 |
| GHT | = | Hourly global solar radiation on glass cover per unit area, J/m2/h |
| GT | = | Total daily solar radiation on glass cover for experimental period, MJ/m2/day |
| Hfg | = | Latent heat of water, J/kg |
| md | = | Mass of distillate, kg/h |
| = | Steady-state evaporation flux from wick under constant solar radiation, kg/m2/s | |
| = | Feed rate per unit area, kg/m2/s | |
| n | = | Number of effects |
| P | = | Distillate productivity, kg/m2/day |
| Ta | = | Average daily ambient temperature, °C |
| Tf | = | Feed water temperature, °C |
| Vw | = | Wind velocity, m/s |
Greek letters
| δp | = | Gap between partition plates, mm |
| ηc | = | Cumulative efficiency |
Subscripts
| m | = | Mean |
Abbreviations
| FW-BVMED-HR | = | Floating wick basin type vertical multiple effect diffusion solar still with heat recovery |
| PVC | = | Polyvinyl chloride |
| VMED | = | Vertical multiple effect diffusion |
| TDS | = | Total dissolved solids |
Acknowledgments
The authors gratefully acknowledge that this work has been funded by Water technology initiative, Department of Science and Technology, Government of India vide letter no. DST/TM/WTI/2K13/122(G) dated 20/05/2014.