Photovoltaicthermal and greenhouse type solar stills are also covered. Use of a heat storage system with 18 kg mass 2 cm thickness of paraffin wax beneath the absorber plate keeps the operating temperature of the still high enough to produce distillated water during. There was a significant difference in productivity of still with and without lhtess. The influence of depth and width of trays on the performance of the stepped solar still were investigated by kabeel et al. They reported that the inclined type solar still, with coral fleece and weir meshstepped absorber plate had, more productivity. Hydro power plants, an overview of the current types and. Two cascade solar stills with and without lhtess was constructed for comparison of the stills productivity in sunny and cloudy days. Dashtban and tabrizi 8 investigated weir type cascade solar still integrated with phase changing martial to keep latent heat during lake of sunshine also at night. Computational fluid dynamics cfd simulation of fluid flow in weirtype cascade solar stills with different geometries has been presented in this paper. Different designs of passive solar stills are fabricated and tested by various researchers to meet. Solar distillation dissertation evaporation purified. Comparative study of two weir type cascade solar stills with and without pcm storage using energy and exergy analysis. Thermal analysis of a weirtype cascade solar still integrated with pcm storage.
Weir type cascade solar stills recuperate the dry spot and channelization problems by forcing brine to flow over each step. Comparison between energy and exergy efficiencies in a weir. Recent advances in stepped and weir type solar still. A weir type cascade solar still, integrated with latent heat thermal energy storage system, was designed with the view of enhancing productivity. Experimental study of an integrated single basin solar still. In the present work, the performance of modified solar still mss with modified steps. In this paper, the comparative study of energy and exergy performance of two weir type cascade solar stills with and without pcm storage in sunny and semicloudy days is carried out. Tabrizi ff, dashtban m, moghaddam h 2010 experimental investigation of a weir type cascade solar still with builtin latent heat thermal energy storage system. The solar still was constructed using black stainless steel basin. This paper gives the details about parameters, performance of stepped and weir type solar still and. Performance study of an innovative heating technique for a. Two cascade solar stills were constructed with and. Researchers always desire to get maximum solar energy for their systems. The average efficiencies for ptc, cascade solar still and single basin solar still were about 50 %, 39% and 27 %, respectively.
Experimental investigation of a weir type cascade solar still with builtin latent heat thermal energy storage system. Solar still distillate productivity enhancement by using. Experimental investigation of a weir type cascade solar still with builtin latent heat thermal energy storage system article pdf available in desalination 260s. Previous studies on enhancing the productivity of active and passive solar stills with pcm are also presented. Performance evaluation o f a stepped solar still w ith. Energy analysis of a stepped cascade solar still connected. Solar still using phase change material paraffin wax. Single basin solar still was provided with various absorbing materials and fins on basin by v. Cascading solar water features cascade water feature. Different design and operational parameters researches on stepped solar stills. In this study, the exergy analysis of a weirtype cascade solar still connected to photovoltaic thermal pvt collectors is provided. The solar stills can be further subclassified into the following three categories.
Request pdf thermal analysis of a weirtype cascade solar still integrated with pcm storage a weirtype cascade solar still, integrated with latent heat thermal. This was designed to enhance the productivity of distillate. Thermal modeling, experimental validation, and comparative analysis of modified solar stills. They concluded that, productivity is increased by 31% for system with pcm. The paper presented the performance of solar still under tropical environment during monsoon period. Tabrizi ff, dashtban m, moghaddam h 2010 experimental investigation of a weirtype cascade solar still with builtin latent heat thermal energy storage system. The schematic diagram of weirtype solar still is shown in fig.
A weir type cascade stepped solar still was equipped with a paraffin waxenergy storage medium and was analysed by dashtban and tabrizi 78. Dunkles correlation, heat transfer coefficients, productivity. In addition to, by increasing the residence time, low thickness of the water layer increases water temperature within the still which will lead to higher efficiency. Energy analysis of a stepped cascade solar still connected to. Its main reasons are thin layer of brackish water, the forced mode of brackish water flow and higher evaporation rate in the stepped cascade solar still. This paper gives the details about parameters, performance of stepped and weirtype solar still and.
Thermal analysis of a weirtype cascade solar still. Theoretical and experimental study of cascade solar stills. Performance evaluation of a stepped solar still with thermal. Experimental performance assessment of a photovoltaicthermal. The schematic diagram of weir type solar still is shown in fig. The device was consisted of a base frame made up of angle irons of size. A weirtype cascade solar still was designed and constructed by tabrizi et al. A new empirical model for water production in a double slope tiltedwick type solar still r. A weirtype cascade solar still, integrated with latent heat thermal energy storage system, was designed with the. Thermoeconomic assessment of a novel design of a solar. Pdf experimental investigation of a weirtype cascade. The main drawback of passive solar still is its lower efficiency and distillation output. Nov 11, 2015 the simplest and easily accessible type of solar distillation is passive solar still which utilizes freely and abundantly available sun energy for removal of salinityimpurity from salinebrackish water.
Hydro power plants, an overview of the current types and technology. These studies show that a passive solar still with pcm shows a productivity improvement of up to 120% compared with a solar still. The solar still consisted of an evaporating chamber, a condensing chamber and phase change material pcm in between them for heat recovery from solar intensity as well as the latent heat. Zoori et al 5 have investigated the effect of mass flow rate on energy and exergy of a weir type cascade solar still the results obtained showed that the maximum energy and exergy efficiencies are obtained at the minimum inlet brine flow. Pdf solar stills were used for water desalination in arid lands with lack of water in the fair climatic conditions. Pdf sustainable system for water desalination semantic. Modeling and experimental study of cascade solar still. In their experiment, they studied the system with and without pcm and recorded the productivity of both cases. The advantages of weirtype cascade solar stills is it do not suffer from dry spot.
The results show that the average energy and exergy efficiencies in tracking and fixed systems. By writing energy and exergy conservation equations for glass cover, brine, and absorber plate. A weir type cascade solar still, integrated with latent heat thermal energy storage system, was designed with the view of enhancing productivity 6. A perfect exergy analysis is used to obtain irreversibility rates, exergy fractions. Comparative study of two weir type cascade solar stills. Experimental study of an integrated single basin solar. Solar still, basin type solar still, vertical basin, weir type, stepped solar still, evacuated tubes. Experimental investigation of a weirtype cascade solar still with builtin. The total productivity of still without lhtess was slightly higher than the still with lhtess in sunny days. In this study, the exergy analysis of a weir type cascade solar still connected to photovoltaic thermal pvt collectors is provided. Efficiency of weir type cascade still was found 22% higher than stepped solar still. Modeling and analysis of unsteadystate thermal performance.
Due to the stored energy in the pcm, the water production period lasted much longer than the solar still without pcm, leading to a remarkable improvement of. Among them, the design of basin type double solar still murugaval and srithar 2011, a weir type cascade solar still tabiriz et al. In their experiment they studied the system with and without pcm and recorded the productivity of both cases. S439s450 s441 that the tiltedwick type solar with charcoal cloth as absorbing and evaporating material is good material to be used in the still and the efficiency of the still is about 53% on clear days in summer. Deepdyve is the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Research article experimentalstudyonvarioussolarstilldesigns. A new empirical model for water production in a double slope. Comparison between energy and exergy efficiencies in a weir type.
Comparative study of two weir type cascade solar stills with. Solar still using phase change material paraffin wax ijert. Deepdyve is the easiest way to get instant access to the academic journals you need. Pdf experimental investigation of a weirtype cascade solar. Velmurugan, et al, 2008 and found to improve the operational efficiency. Sep 16, 20 read comparison between energy and exergy efficiencies in a weir type cascade solar still, desalination on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Heat transfer enhancement of solar still using phase. Exergy analysis of a weirtype cascade solar still connected. Effect of water flow rate on internal heat and mass transfer and daily productivity of a weirtype cascade solar still. Various modes of heat transfer in the collector have been analyzed to develop the model. Exergoeconomic and energy efficiency analysis of cascade solar still using a sun tracking 61 assessment could be used to optimize the design of cascade solar still a sun with tracker. Experimental investigation of improving received radiation by an hourly sun tracking on a weir type cascade solar still, international journal of heat and technology.
The performance of trapezoidal glass cover solar still. Different designs of stepped solar still with low cost modifications are tabulated in table 1. Heat transfer enhancement of solar still using phase change. Weir type cascade solar still 6 figure 4 shows the weir type cascade solar still.
Design and development of solar desalination plant matec. A modified basin type singleslope multiwick solar still mbssmwss was proposed and fabricated to increase the productivity and improve the low efficiency of the recently designed modified basin type singleslope solar still mbssss. Phase change materials pcms for improving solar still. Comparison between energy and exergy efficiencies in a weir type cascade solar still halimeh aghaei zoori, farshad farshchi tabrizi, faramarz sarhaddi, fazlollah heshmatnezhad chemistry.
This type of solar still possess two significant qualities i. The pictorials view with different component of wick type solar still is shown in plate1. Pdf experimental investigation of a weirtype cascade solar still. Solar stills are one of desalination devices for brackish water distillation using the solar energy. In this paper, a theoretical and experimental study of the energy and exergy efficiencies of cascade solar still is presented. The design of a wick type solar still is presented in fig. Zoori et al 5 have investigated the effect of mass flow rate on energy and exergy of a weir type cascade solar still the results obtained showed that the maximum energy and exergy efficiencies are. Experimental investigation of a weirtype cascade solar. However, the need for an external electrical source for water circulation is the main deficiency of the stepped cascade solar still.
After few improvements have been made, todays stateoftheart singleeffect solar stills have an efficiency of about 3040% 5. Also pcm is effective for lower masses of basin water during winter season. Aug 14, 2012 more specific studies include a hemispherical solar still 7, 8, pyramid solar still 9, 10, doublebasin solar still 1115, triple basin solar still, multiple basin solar still 17, 18, inverted absorber solar still 1922, tubular solar stills 2326, compound parabolic concentrator cpc solar still, weirtype cascade solar. Experimental investigations on a portable atmospheric. Comparison between energy and exergy efficiencies in a. Cfd simulation and second law analysis of weirtype cascade solar. Seawater or brackish water desalination process using reverse osmosis as one of the current treatment technologies is expensive.
The effect of flow rate was also investigated on the total productivity of stills during. Experimental investigation of a weirtype cascade solar still with builtin latent heat thermal energy storage system article pdf available in desalination 260s. Astandard weir type with rubber weir, bderivation including accumulation cascade. The results show that the average energy and exergy efficiencies in tracking and fixed systems reached about 36 % and 14 %, for fixed system 33 % and 11%, respectively. But the most solar system designis ed as a fixed model without any sun tracker. Tabrizi, et al, 2010 carried out experiment on a weir type cascade solar still with built in latent heat thermal energy storage.
Solar stills aston publications explorer aston university. Farshad farshchi tabrizi, mohammad dashtban and hamid moghaddam, 2010. Thermal modeling, experimental validation, and comparative. They reported that the inclined type solar still, with coral fleece and weir mesh stepped absorber plate had, more productivity. By formulating the energy balance for different components of solar still system, the governing equations were obtained as a set of nonlinear ordinary differential equations. Wick type solar still wick type solar still was fabricated at the central workshop of the college of agricultural engineering and technology, dapoli. Two cascade solar stills were constructed with and without latent heat thermal energy storage system by suing stearic acid as phase change material in their study. Dashtban and tabrizi 8 investigated weirtype cascade solar still integrated with phasechanging martial to keep latent heat during sunshine hours on the lake till nightfall. This study presents theoretical and experimental exergoeconomic and thermal efficiency of weir type cascade solar still using sun tracking. Different designs and parametric study of solar water. Dashtban and farshchi 2011 used an integrated weir type cascade solar still with a latent heat thermal energy storage system to enhance the still productivity. The efficiency of weir type solar still was increased by 35% with the use of pcm 22.
They used 18 kg mass of paraffin wax 2 cm thickness beneath the absorber plate which keeps the operating temperature of still high enough to produce the distillated water in. Citescore is the number of citations received by a journal in one year to documents published in the three previous years, divided by the number of documents indexed in scopus published in those same three years. It consists of a dull black painted absorber plate of 15 steps each with a weir of 5 mm in height and 59 cm in length increasing the time of residence of water in the still. A new empirical model for water production in a double. Measured data for the average production obtained as 4.
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