Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: ca
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Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: case study Ankur Geete1 · Devesh Kharve1 · Hemant Patel1 · Hansraj Karma1 · Ashok Prajapati1 · Shubham Sharma1 Received: 22 August 2019 / Accepted: 15 April 2020 © Springer Nature Switzerland AG 2020
Abstract In this research project two solar still plants have been fabricated; single and double slope still plants. The exergy and exergy efficiency concepts have been applied for the comparative analyses of both solar stills. Experimental readings, i.e. various temperatures, amounts of distilled water and solar radiations have been taken for solar stills at different time intervals in Indore (22° 43′ 4.51″ N and 75° 49′ 59.88″ E). The percentage variations in the different parameters, i.e. increments in temperature, increments in quantity of water, thermal efficiencies, rates of exergy at inlet/outlet and exergy efficiencies have also been calculated for stills at various solar intensities and time intervals. After experimental and comparative analyses, better outputs have been shown at 14:50 PM for double slope and 14:45 PM for single slope plant due to the cumulative effects of solar radiations on the still plants. During this period thermal/exergy efficiencies, i.e. 46.630/1.949% and 47.259/3.389% were found the best. The performance of single slope solar still has been found better, and 14:30 to 14:50 PM time interval has been recorded superior for the distillation of water through still plants where percentage increments of the performance evaluating parameters were enhanced. Keywords Single and double slope solar stills · Thermal efficiency · Rates of inlet and outlet exergy · Exergy efficiency · Solar radiation List of symbols C Specific heat of water (J/kg K) dTw Temperature difference which was achieved due to solar energy (K) IbRB Solar radiation which is available for single and double slope solar still (W/m2) L Length of the solar still (m) m Mass flow rate of pure water (kg/s) T0, Tw and Ts Ambient, water and Sun’s surface temperatures (K) W Width of the solar still (m)
Greek symbols η Thermal efficiency of the solar still (%) αg, ρg and τg Absorptivity, reflectivity and transmissivity of the glass Ψin and Ψout Exergy at inlet and outlet for single and double slope solar still (W)
1 Introduction A technology has been developed by the researchers for the purification of water which is simple, economical and also eco-friendly. This technology is based on the solar energy. Solar still plant is used to purify the water by heat of the Sun [1]. In this still plant the water evaporates and this water vapour goes upside where the tilted glass is placed. At the glass surface, water condenses and
* Ankur Geete, [email protected] | 1Mechanical Engineering Department, Sushila Devi Bansal College of Technology, Indore, Madhya Pradesh, 453331, India. SN Applied Sciences
(2020) 2:963
| https://doi.org/10.1007/s42452-020-2763-7
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