Enhancing the double-slope solar still performance using simple solar collector and floatable black wicks (original) (raw)
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2016
Water is essential for life and fresh water is a finite<br> resource that is becoming scarce day by day even though it is<br> recycled by hydrological cycle. The fresh water reserves are being<br> polluted due to expanding irrigation, industries, urban population and<br> its development. Contaminated water leads to several health<br> problems. With the increasing demand of fresh water, solar<br> distillation is an alternate solution which uses solar energy to<br> evaporate water and then to condense it, thereby collecting distilled<br> water within or outside the same system to use it as potable water.<br> The structure that houses the process is known as a 'solar still'. In this<br> paper, 'Modified double slope solar still (MDSSS)' & 'Modified<br> double slope basin type multiwick solar still (MDSBMSS)' have been<br> designed to convert saline, brackish water into drinking water. In thi...
Design and Experimental Studies on a Single Slope Solar Still for Water Desalination
Water
Gulf countries experience an imbalance between water supply and demand, which leads to a dramatic decline in the amount of groundwater. Solar energy for water desalination is an attractive option in this region, where the climate is sunny all year. A very basic solar device called a single basin solar still is commonly used to convert available seawater into drinkable water. The issue of producing drinking water may be resolved by using this technique, but because of its low productivity, it is rarely used. The experiments were carried out on a south-facing, single slope solar still with a 23-degree inclination of the condensing cover from October to November 2022, on different days for different water depths. According to the findings, the solar still with 4 cm of depth (as compared to 5, 6, and 7 cm) exhibited the maximum water productivity (2.680 L/day) with an efficiency of 30%. When the solar still was equipped with an external mirror, the temperature in the basin was raised, a...
Research and design of an improved solar still for desalination
Science and Technology Development Journal, 2018
Water is one of the most important resources on Earth because of its vital role for human beings and other living creatures. During the devastating drought in the Mekong Delta in 2016, millions of people had no access to the secure source of fresh water. This issue cautioned and influenced the Vietnamese government to find an effective desalination process for the coastal areas impacted heavily by salinization. However, desalination processes require large amounts of energy which can be a problem for the coastal areas due to the lack of energy and high cost. The main purpose of the study herein was to find an alternative solution for desalination by designing a desalination system using solar energy. The design was expected to provide a small size desalination system for households. The average output of the system was about 854 ml/day with the productivity at 2223.54 ml/day/m2. The average water capture efficiency was 80.5%, the salt elimination efficiency of the system was about 9...
Analytical Comparison and Evaluation of Single Slope Single Basin Stepped Type Solar Still
International Journal of Advance Research and Innovative Ideas in Education, 2017
Concern for environment and ever increasing demand for energy, combined with relentless advancement in renewable energy innovations, are interested in the new opportunities to accomplish in the field of use of renewable energy resources. Till date, solar energy is the most clean, cheap and inexhaustible among all renewable resources. The power from the sun is many times larger than the present rate of energy consumption on the earth. Solar still is one of the finest ways to harness the solar power. A simple and effective device which is applied for obtain distilled water from the saline water with the solar desalination process is known as solar still. The conventional still produces 2–3 l fresh water per day (9AM to 5PM) but the output of stepped solar still is quite high compared to the conventional. There are various scientists and researchers who investigated the effect of design parameters, climate parameters and operational parameters to review the effect of these parameters w...
Improved Pyramid Solar Still for Solar Water Desalination – A Case Study
International Review of Mechanical Engineering (I.RE.M.E.), 2020
Solar energy is considered as an available source of huge amount of thermal energy with low cost and it is environmentally friendly. Seawater desalination is the main source of freshwater in many countries using different technologies. Seawater desalination using solar thermal energy with passive techniques is vital for arid areas that have shortage in electricity grids or any other sources of energy. In this study, an experimental investigation for a solar still with pyramidal cover in the environmental conditions of arid regions in Saudi Arabia has been conducted. The pyramid surfaces have been designed and directed so that one of the faces receives sunlight directly for a period, which helps in the process of evaporation faster, and the other interface is away from the rays so that the temperature is low to help in the process of condensation of steam. In addition, a seawater feeding system is designed to maintain a constant level of water height within the basin. The accumulated freshwater productivity along sun shining period of the day has reached 3230 gm and the instantaneous productivity takes place at the maximum irradiance period and it has reached 472 gm. The energy and the exergy analyses for the system have indicated that the energy and the exergy efficiencies of the system have reached a maximum of 60% and 5%, respectively. The over day energy and exergy efficiencies of the system have been 31.6% and 2.35%, respectively. The produced freshwater cost from the system has been found out to be 0.1 $/L/m2.
International Journal of Photoenergy, 2023
This research work explored and compared the experimental performance of a solar still having novel octagonal-pyramid shape with a single slope solar still. It is found that the novel still provides twice distillation compared with conventional still. The experiments also evaluated the desalination productivity of octagonal-pyramid solar still by varying the depth of saline water inside the basin and angle of inclination of glass cover. It is observed that the optimum condition for high distillation is obtained when depth of water inside the basin is 5 cm with angle of inclination of glass cover which is 30°. Four types of water, i.e., underground borewell water, sea water, leather industry effluent, and plastic industry effluent were also used to see the effect on distillation. Results showed that underground borewell water provides high distillation due to low density. Furthermore, the performance of the octagonal-pyramid solar still is enhanced by adding different latent heat and sensible heat materials in the octagonal-pyramid solar still. Hence, the addition of brick to the octagonal-pyramid still yields the highest productivity compared to incorporation of paraffin wax. Hence, it can be concluded that the octagonal design of the solar still has shown an increased productivity when compared to a single slope solar still (conventional still) under all the conditions.