Parallel forced mode configuration of the solar still would produce higher yield than the other configurations and obtained as 7. For this purpose two double slope solar still of same size are used in the experimental work. For singlebasin singleslope active solar still, stepped still coupled to solar air heater is the most suitable design with 112% improvement in. Pdf in this communication, the technoeconomic analysis of double slope active solar still under natural circulation mode has been carried. Research article experimental investigation on single slope double basin active solar still coupled with evacuated glass tubes mitesh i patel 1, p m meena 2 and sunil inkia 3 address for correspondence 1 reaserch scholar, mechanical engineering department, m. They found that the productivity of the distiller with a vertical mirror is 20 % greater than that of the double slope still. The results clearly states that the productivity of the solar still is inversely proportional to the water depth. Decreasing the thickness of the water layer and adding the dye increase the amount of distilled water. The areas of double slope solar still and flat plate collector are 2 m 2. Phase change materials pcms for improving solar still.
An experimental investigation of the factors which affect. Analysis of double slope single basin solarstill using. Solar distillation system proves to be a promising technique for water purification. Pdf experimental investigation of double slope solar still for the. A project report on solar still submitted in partial fulfillment for the award of the degree of bachelor of technology in mechanical engineering from rajasthan technical university, kota session 2012 guided by. Performance investigation on double slope solar still. Design, fabrication, and performance evaluation of double slope. The hourly thermal and exergy efficiency of active solar still have also been evaluated for 0. Experimental investigation of double slope solar still for. Analytical characteristic equation of nanofluid loaded active double. This research work aims to build an experimental, numerical and theoretical model for active solar still to test the thermal performance behavior. In this article an attempt has been made to develop thermal model of double slope passive solar still on the basis of energy balance of east and west condensing covers, water mass and basin liner. Pdf technoeconomic analysis of double slope active solar still.
Therefore, an attempt will be made for estimation of economic study of the double slope type solar distillation unit. Design and fabrication of a single slope solar still with. Design, fabrication, and performance evaluation of double. Design, fabrication and performance evaluation of solar. Solar stills are systems of easy operation and low cost that, through the use of energy. A active double slope solar still coupled with series connected partially covered n photovoltaic thermal flat plate. The performance of the double slope solar still coupled with. In this study double slope active solar still under forced circulation mode was designed and fabricated, and distillate output and instantaneous thermal efficiency. Previous studies on enhancing the productivity of active and passive solar stills with pcm are also presented. Analytical expressions for water temperature, inner and outer condensing covers temperature and distillate yield have been derived as a function of climatic and design parameters.
Headley 1973, an inverted trickle solar still badran et al. Double slope type solar still department of mechanical engineering page 1 maharana institute of technology and sciences gaura, mohanlalganj, lucknow a project report on construction of double slope type solar still submitted in partial fulfillment for the award of the degree of bachelor of technology in. Dev and tiwari 2124 have also reported that the nonlinear characteristic curves are best fit to predict the behavior of solar stills. It has been observed that the cost of distilled water produced from double slope active solar still under natural circulation mode on the basis of energy analysis is rs. Most of the water resources are under the stage of depletion. Table 8b gives embodied energy of the proposed design as. In this research paper internal heat transfer coefficient of a new design of solar still known as double slope active solar still under forced circulation mode have been calculated by using the dunkle thermal model and kumar and tiwari model. It has been observed that the thermal efficiency of double slope active solar still is lower than the thermal efficiency of double slope passive solar still. Single slope solar still, cfd introduction now days, lack of drinking water is majour problem in most of the countries. The single slope and double slope solar stills are the conventional low temperature solar stills, operating at a temperature below 60oc. Evaporation and condensation are the basic principles used in solar still. Modeling and verification of double slope single basin solar still. Evaluation of internal heat transfer coefficient of double. Pcs are the chemicals which enhances the evaporation rate of water in solarstill in the presence of sunlight without reacting with water and without getting consumed.
A thermal model for predicting the performance of a solar still with. S429s438 hence, for same irradiance conditions, the performance of the still varies place to place and day to day due to. Dev and tiwari 1114 shows the characteristic equation for single slope passive solar still, hybrid photovoltaic thermal pvt active solar still, double slope solar still and inverted absorber solar still at different water depths, inclinations and climatic conditions. Double slope active solar still with a concentrator. Comparative output from newly developed solar still was low but it has several advantages that it is cheapest, cost efficient and easy to clean. Double slope step type solar still of area 1 m2 is constructed using a glass pieces. Read experimental validation of thermal model of a double slope active solar still under natural circulation mode, desalination on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Research article experimentalstudyonvarioussolarstilldesigns. Experiments were conducted in different water depth 1cm, 2cm, 3cm and 4cm.
Performance and numerical analysis of single basin solar. Pdf a single basin double slope solar still of 1 m2 basin area is. Evaluation of a preheating system for solar desalination. It is observed that water temperature plays a vital role in the distillate output the yield since it increases significantly with the rise of basin water temperature. Computer modeling of passiveactive solar stills by using. Solar still with cooling water flowing between a doubleglass cover. Experimental evaluation of a single slope solar still. The flat plate collector is integrated with double slope solar still in such a way that the hot water from collector plate enters into the basin under natural circulation.
It was essential to check whether the technology was economically viable or not. Characteristic equation of double slope passive solar still characteristic equation of double slope passive solar still dev, rahul. Isrn renewable energy 7 pressure head graduated tubes concentric tubes. A double slope single basin, passive type, still with basin area of 1. Experimental analysis of double slope solar still aniket kavlekar1 1department of mechanical engineering 1vit university vellore, tamilnadu, india abstractwith rising population, industrialization and environmental pollution, availability of portable water is. Heat mass transfer and thermophysical analysis for pyramid. The two main categories of basin stills are single and double sloped.
This system is designed with the aspects of cost, handling, maintenance and its effectiveness. Economic feasibility evaluation of solar distillation. Recently, elmaghlany 2015 optimized the glass cover inclination angle of double slope solar still and concluded that optimum cover tilt angle. For the present study, double slope active solar still. The present work aims to study the effect of preheating the water. Thermaleconomic analysis and comparison between pyramidshaped and singleslope solar still configurations have been presented by fath et al.
The function of solar still is to produce fresh water based on evaporation process, utilizing the solar energy. Modeling and analysis of unsteadystate thermal performance of a. Experimental validation of thermal model of a double slope. Exergy analysis of double slope active solar still under forced. Single slope versus double slope basin stills two configurations were proposed for basin type stills also referred to as simple, roof, conventional and greenhouse stills. The double sloped basin still has two sloped pieces of glass rather than one. Pdf technoeconomic analysis of double slope active. Therefore the raising of the productivity and efficiency of solar still represents the most important problems that need further research. The embodied energy of single and double slope solar still has been evaluated by multiplying mass of each component with their energy density as shown in table 8a. Faculty of engineering, computing and sciencemechanical engineering double slope active solar still with a concentratormohammad saad yousuf, mohammad shoaib faculty of engineering, computing and s. Annual energy and exergy analysis of single and double. Tiwari have reported that the thermal efficiency of double slope passive solar still is higher than the double slope active solar still 14. An experimental study was conducted to enhance the productivity of double slope solar still by storage of thermal energy in day time with the help of phase change materials pcm. Effect of glass inclination angle on solar still performance.
They are used in areas where drinking water is unavailable, so that clean water is obtained from dirty water or from plants by exposing them to sunlight. In this paper, the fabrication of seven solar still designs such as spherical solar still, pyramid solar still, hemispherical solar still, double basin glass solar still, concentrator coupled single slope solar still, tubular solar still and tubular solar still coupled with pyramid solar still and their performance evaluation in converting. Characteristic equation of double slope passive solar still. Thermal modeling and carbon credit earned of a double. In recent years, many people have been using solar still. Design and fabrication of a single slope solar still with variable collector angle.
The single basin solar still integrated with salt gradient solar. A doublebasin experimental solar still is fabricated as shown in figures 8, 9, and 10. A solar still distills water with substances dissolved in it by using the heat of the sun to evaporate water so that it may be cooled and collected, thereby purifying it. Design fabrication and performance of hybrid active pvt. Of the above two, single slope solar still is more versatile and efficient than double slope solar still. Solar stills are very effective way of water desalination method. In a passive still the distillation takes place purely by direct sun light.
Pcs are the chemicals which enhances the evaporation rate of water in solar still in the presence of sunlight without reacting with water and without getting consumed. The solar still is nonconventional, cheap, simple, easy to construct and is of low thermal capacity. The impure water in the solar still is heated by solar radiations. Performance correlation for singlebasin doubleslope. The conversion of raw water to purify water has been done by a double slope solar still system. Solar stills are systems of easy operation and low cost that, through the use of. Experimental validation of thermal model of a double slope active solar still under natural. Solar still,a water purifying technique project report 1. The annual yield for single and double slope solar still is given in table 3a. Solar still,a water purifying technique project report. Evaluation of a preheating system for solar desalination system with linear fresnel lens. Thermal model and characteristics of double slope solar still. Active still, basin still, collector, concentrator, diffusion still, multiwick still.
Studied both passive and active solar stills for different indian climatic conditions. The double slope active solar still under natural modes gives 51% higher yield in comparison to the double slope passive solar still the hourly thermal and exergy efficiency of active solar still have also been evaluated for 0. A double slope single basin solarstill with basin area 1 m2 is used for solar desalination. Double slope type solar still department of mechanical engineering page 46 components of solar still solar still is a simple device which can convert available water or brackish water into portable water by using solar energy. The main parts of still are basin, frame, glass cover and support structure. Experimental results on the performances of ten solar stills with different glass inclination angles are presented. Solar still is an economical and easy method for production of pure water. Solar energy is very useful in the process of desalination especially for areas that suffer from a lack of clean water resources.
The temperature of water surface is closely related to the incident solar radiation. Solar still type and yield still type yield lm2day angle 24. A cross sectional view and photograph of a double slope active solar distillation system under natural mode has been shown in fig. These studies show that a passive solar still with pcm shows a productivity improvement of up to 120% compared with a solar. Tiwari have reported that the thermal efficiency of double slope passive solar still is higher than the double slope active. The double slope active solar still under natural modes gives 51% higher yield in comparison to the double slope passive solar still the hourly thermal and exergy efficiency of active solar. The experiments were conducted for many days with different brine depths in the basin from january to. Research article experimental investigation on single. Abstract this work presents the development of a flexible, efficient, robust and low cost single solar still. On the basis of motion of the sun, in different seasons and. Performance and numerical analysis of single basin solar still.
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