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Now showing items 1 - 16 of 68

  • Experimental analysis of single-basin solar still with porous fins

    Panchal, Hitesh   Sathyamurthy, Ravishankar  

    The present research paper explains the experimental analysis of the single-basin solar still with attachment of porous fins on the absorber plate. Here, experiments have been conducted on the single-basin sola still with and without attachment of porous fins. Generally, fins are used in the solar still to reduce the preheating time of water and attain positive water and inner glass cover temperature during morning hours for increment in distillate output. Series of experiments were performed in the Government Engineering College Patan during May 2017 during sunshine hours. Various temperatures such as that of water, inner glass cover and solar insolations have been measured by standard instruments. From the experiment, it was found that the distillate output after attachment of fins was 3.8 L and that of the conventional solar still was 2.67 L. Hence, a percentage increment of 42.3% was found by use of porous fins in a solar still.
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  • Thermophysical properties of CNT and CNT/Al2O3 hybrid nanofluid

    Devarajan, Mageshbabu   Krishnamurthy, Nagarajan Parasumanna   Balasubramanian, Madhu   Ramani, Bharathwaaj   Wongwises, Somchai   Abd El-Naby, Kabeel   Sathyamurthy, Ravishankar  

    This work presents the thermophysical properties of carbon nanotubes (CNT) and CNT/Al2O3 hybrid nanofluids for heat transfer applications. An equal proportion of nanoparticles CNT (50%) and Al2O3 (50%) were added to the base fluid for two different concentration of 0.05 and 0.1%. Results show that addition of Al2O3 nanoparticles with CNT nanofluid improves the thermophysical properties. The thermal conductivity of hybrid nanofluids improved by 20% with a maximum concentration of 0.1%, while the thermal conductivity of CNT alone improved by only 8% with the base fluid. Similarly, density and viscosity of hybrid nanofluid increased up to 7 and 10%, respectively, while comparing it with the base fluid. The result of specific heat energy capacity of hybrid nanofluids increases to about 138% than CNT nanofluid with a maximum concentration of 0.2%.
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  • Experimental studies on passive inclined solar panel absorber solar still

    Sasikumar, C.   Manokar, A. Muthu   Vimala, M.   Winston, D.   Kabeel, A. E.   Sathyamurthy, Ravishankar   Chamkha, Ali J.  

    This manuscript aims to analyze the passive inclined solar panel basin (PISPB) still at diversified flow rate of water (m(f)). The freshwater collected from the solar still for different m(f) at 4.68, 7.56 and 10.08 kg h(-1) is 3.7, 2.7 and 1.6 kg, respectively. Results showed that at higher flow condition, the still energy and exergy efficiency decreases and it is estimated as 36.06, 25.56 and 16.95% and 2.97, 1.91 and 1.01%, respectively, for flow rates of 4.68, 7.56 and 10.08 kg h(-1). Results revealed that electrical, thermal and exergy efficiency of photovoltaic panel increases under higher flow condition and it is found as 8.05, 8.81 and 9.44%, 11.43, 20.8 and 22.17 and 19.38, 20.58 and 21.16% for mass flow rates of (m(f)) 4.68, 7.56 and 10.08 kg h(-1), respectively. When the m(f) increases, there is a decrease in the PISPB still distilled water production rate, thermal and exergy efficiency, and there is an increase in power production, electrical, thermal and exergy efficiency through the photovoltaic panel.
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  • Sand dunes effect on the productivity of a single slope solar distiller

    Khechekhouche, Abderrahmane   Benhaoua, Boubaker   Manokar, Muthu   Sathyamurthy, Ravishankar   Kabeel, Abd Elnaby   Driss, Zied  

    Access to drinking water in many parts of the globe is shrinking over the years and much of the water resources are polluted or unpurified. North Africa is facing a huge water shortage due to drought and climate change. Water desalination has become very popular and serves as solar distillation which is proving to be an economical, simple and ecological technique, especially in rural and remote areas. Significant efforts have been made by many researchers in various laboratories to increase and improve the productivity of solar greenhouse distillation. In the present work, emphasis has been placed on the study of a single slope solar distiller having as dimension 50 x 50 cm, in the thickness of the impure water is 1 cm. Natural sand dunes from the El Oued South region of Algeria have been tested as a factor of efficiency improvement. A layer of this sand was deposited on the bottom of the distiller covering the whole surface on which the submit water is emerged. The results show that the productivity of distilled water has unfortunately decreased by 1.46 times.
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  • Investigation and Performance analysis of Solar Milk Pasteurisation system

    Panchal, Hitesh   Patel, Romil   Sathyamurthy, Ravishankar  

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  • Effect of heat removal on tubular solar desalting system

    Arunkumar, T.   Ramalingam, Velraj   Denkertherger, D.   Sathyamurthy, Ravishankar   Vinothkumar, K.   Porkumaran, K.   Ahsan, Amimul  

    The technological process integration will influence directly on the energy efficient conversion with vital role on system productivity. In this work, an attempt was made to investigate on the performance of a compound parabolic concentrator-concentric tubular solar still (CPC-CTSS) coupled with a single slope solar still. A set of 2 m long concentric tubes with rectangular basins of the same length was fabricated (2 m(2) area) and the entire experimental setup was operated with cold water flow over the inner tubes of the concentric arrangement. This pre-heated water was fed to a single slope solar still. The area of the single slope solar still was 0.25 m(2) and the glass had an angle of 11 degrees from the horizontal. It was clearly observed that the yield strongly depends on the evaporative heat transfer coefficient It was concluded that, to increase the distillate augmentation to overnight, phase change material was additionally incorporated in the single slope solar still. (C) 2015 Elsevier B.V. All rights reserved.
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  • Influence of crescent shaped absorber in water desalting system

    Arunkumar, T.   Velraj, R.   Denkenberger, D. C.   Sathyamurthy, Ravishankar  

    An innovative design compound conical concentrator (CCC) with a crescent shaped absorber coupled to a single slope solar still (SSSS) has been investigated. The performance is studied by four different approaches: (1) SSSS alone, (2) CCC-SSSS with crescent shaped absorber, (3) CCC-SSSS coupled crescent shaped absorber with top cover cooling and (4) CCC-SSSS coupled crescent shaped absorber with top cover shaded. This is the first research work ever to analyze the natural circulation of water by covering the SSSS by cotton cloth. The purpose of the external absorber is to circulate the heat by natural circulation mode. The system temperatures such as water temperature, air temperature, inner cover temperature, outer cover temperature and absorber temperatures are measured every 30 min. From the experimental results, the productivity of the single slope solar still, CCC-SSSS with crescent absorber, CCC-SSSS coupled crescent absorber with top cover cooling and top cover shaded CCC-SSSS coupled crescent absorber is 2100 mL/day, 2680 mL/day, 2912 mL/day and 1584 mL/day respectively. (C) 2016 Elsevier B.V. All rights reserved.
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  • Experimental investigation on pyramid solar still in passive and active mode

    Manokar, A. Muthu   Winston, D. Prince   Sathyamurthy, Ravishankar   Kabeel, A. E.   Prasath, A. Rama  

    In this research work pyramid solar still is experimentally researched on both passive and active mode. In active mode, the pyramid solar still is incorporated with straight tube and spiral tube solar water heater. The experiments were carried out by passive and active pyramid solar still at 1cm water depth. It is found that the pyramid solar still incorporated with the spiral tube solar water heater operated at mass flow rate of water at least amount produced the higher productivity of 6.35kg/m(2)/day with the daily energy and exergy efficiency of 15.25 and 3.22%, respectively. The pyramid solar still incorporated with the spiral tube solar water heater increases the productivity, energy and exergy efficiency of about 12.18, 14.58, and 18.76%, respectively as compared to the straight tube solar water heater.
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  • A Review of integrating solar collectors to solar still

    Sathyamurthy, Ravishankar   El-Agouz, S.A.   Nagarajan, P.K.   Subramani, J.   Arunkumar, T.   Mageshbabu, D.   Madhu, B.   Bharathwaaj, R.   Prakash, N.  

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  • Eco-friendly coffee-based colloid for performance augmentation of solar stills

    Essa, F. A.   Elsheikh, Ammar H.   Algazzar, Almoataz A.   Sathyamurthy, Ravishankar   Ali, Mohamed Kamal Ahmed   Abd Elaziz, Mohamed   Salman, K. H.  

    Recently, nanofluids have been extensively used in water desalination systems because of their superior photo-thermal properties and heat transfer characteristics. Most of inorganic nanoparticles such as metal, metal oxides and carbon have adverse environmental impacts due to the risk related to their production and disposal processes as well as the toxicity of some types of them. In addition, their high production cost is another issue that motivates researchers to find low cost and eco-friendly alternatives to inorganic nanoparticles. In this study, coffee-based colloid has been proposed as an organic, low cost, and ecofriendly alternative to conventional inorganic-based nanofluids to augment the fresh water productivity of solar stills (SS). The performance of the modified solar still (MSS) has been experimentally investigated and compared with another conventional solar still (CSS) under the same conditions. The daily freshwater productivity obtained from the MSS was 4865.73 ml/m 2 which was greater than that of CSS by 35.14 %. Energy and exergy efficiencies of MSS were improved by 35.34 % and 46.44 %, respectively, compared with that of CSS. Finally, the economic evaluation of the MSS is carried out via performing cost analysis. The cost of distilled water per liter produced by the modified solar still is 0.0136 $/l. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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  • Effect of forced cover cooling technique on a triangular pyramid solar still

    Nagarajan, P. K.   El-Agouz, S. A.   Arunkumar, T.   Sathyamurthy, Ravishankar  

    In the present study a triangular pyramid solar still is theoretically analysed by flowing air over the entire surface of the glass from the top to analyse the improvement in yield of fresh water. The effect of water mass and wind velocity was theoretically analysed. The results show that there is a significant improvement in the yield of fresh water to about 10.1 kg/m(2) with a maximum velocity of air (U =3D 40 m/s) at a least water mass of 20 kg inside the basin. For practical cases the yield of fresh water depends on naturally occurring wind velocity and the results show that the improvement in yield is 104% with an increase in velocity from 0.5 to 4 m/s.
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  • Investigation on LPG-Biogas Blends in Spark Ignition Engine

    Sathyamurthy, Ravishankar   Hari Krishnan, S.A.  

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  • Experimental investigation of a semi circular trough solar water heater

    Sathyamurthy, Ravishankar   Harris Samuel, D. G.   Nagarajan, P. K.   Jaiganesh, V.  

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  • Factors affecting the performance of triangular pyramid solar still

    Sathyamurthy, Ravishankar   Kennady, Hyacinth J.   Nagarajan, P.K.   Ahsan, Amimul  

    This work presents a few important factors that affect the performance of a triangular pyramid solar still. An experimental work has been conducted to find the effect of water depth on the performance of the triangular pyramid solar still. From the present study, it is concluded that the convective and evaporative heat transfer coefficients are important for designing solar distillation systems and the effect of temperature difference between the evaporative and condensing surfaces is also important to optimize the operating temperature range. The condensing area of the solar still is more than that of evaporating area. Thus the experimental results showed that the effect of depth of water in the solar still affects the fresh water production. Nevertheless, outdoor experimental tests were conducted to study the effect of wind speed variations to cool down the glass cover. It was found that increasing the wind speed from 1.5 to 3 m/s and to 4.5 m/s has the effect of increasing the still productivity by Sand 15.5% respectively. (C) 2014 Elsevier B.V. All rights reserved.
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  • Productivity enhancements of compound parabolic concentrator tubular solar stills

    Arunkumar, T.   Velraj, R.   Denkenberger, D. C.   Sathyamurthy, Ravishankar   Kumar, K. Vinoth   Ahsan, Amimul  

    The performance of compound parabolic concentrator assisted tubular solar still (CPC-TSS) and compound parabolic concentrator-concentric tubular solar still (CPC-CTSS) (to allow cooling water) with different augmentation systems were studied. A rectangular saline water trough of dimension 2 m x 0.03 m x 0.025 m was designed and fabricated. The effective collector area of the still is 2m x 1 m with five sets of tubular still-CPC collectors placed horizontally with north-south orientation. Hot water taken from the CPC-CTSS was integrated to a pyramid type and single slope solar still. Diurnal variations of water temperature, air temperature, cover temperature and distillate yield were recorded. The results showed that, the productivity of the un-augmented CPC-TSS and CPC-CTSS were 3710 ml/day and 4960 ml/day, respectively. With the heat extraction technique, the productivity of CPC-CTSS with a single slope solar still and CPC-CTSS with a pyramid solar still were found as 6460 ml/day and 7770 ml/day, respectively. The process integration with different systems cost was found slightly higher but the overall efficiency and the produced distilled water yield was found augmented. (C) 2015 Elsevier Ltd. All rights reserved.
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  • Geometrical variations in solar stills for improving the fresh water yieldA review

    Sathyamurthy, Ravishankar   Samuel, D. G. Harris   Nagarajan, P. K.   Arunkumar, T.  

    Water consumption by humanity is one of the major yardsticks to assess its civilization. Humans depend on groundwater sources for drinking. Some of these underground water sources cannot be used for drinking due to pollution. To solve the issues related to drinking water, several methods are employed, and a promising one is solar desalination. This paper communicates a review of different geometrical shapes of solar still. The present study concludes that the geometry in the solar still significantly influences the yield of fresh water.
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