Showing papers by "Ravishankar Sathyamurthy published in 2019"
TL;DR: In this paper, the absorber plate of a pyramid basin type solar still is coated with TiO2 nanoparticles doped in black paint on the basin to analyze the performance under the various depth of water.
189 citations
TL;DR: In this article, the authors presented a mini-review of a new type of solar still named tubular solar still (TSS), its working method, thermal analysis, performance and method of enhancement.
130 citations
TL;DR: In this article, an attempt is made to analyze the present status of different designs in the inclined solar still (ISS) to motivate further research in ISS technology for meeting the demand of fresh water.
Abstract: The current challenge of human society is to meet the large demand of freshwater, which is depleting at a faster rate due to a rapid rise in human population and fast urbanization. Solar still is the economical way to obtain fresh water since it solely requires the energy from the sun alone for its operation, which is abundantly and freely available in nature. The major constraint in conventional solar still (CSS) is to maintain a large surface area of water with a minimum water depth. The best solution for the above constraint is to prefer inclined solar still (ISS) in which the surface area of water is large with a minimum water depth. In order to improvise the performance and efficiency of ISS, numerous works have been incorporated by increasing the free surface area of water. The distillate yield collected from the passive ISS was found as 1000–8100 mL/m2 whereas active ISS produced the distillate yield of 1045–9000 mL/day. In this review, an attempt is made to analyze the present status of different designs in ISS to motivate further research in ISS technology for meeting the demand of fresh water.
66 citations
TL;DR: In this article, the use of MgO and TiO2 nanofluids at different concentrations was investigated annually to evaluate the distillate output of stepped solar stills.
Abstract: The use of MgO and TiO2 nanofluids at different concentrations was investigated annually to evaluate the distillate output of stepped solar stills. Nanofluids concentrations ranged from 0.1 to 0.2% in the present research work. Results confirm that the stepped solar still distillate output is increased by 45.8%, 33.33%, 20.4% and 4.1% with use of MgO nanofluids (0.2% and 0.1% concentrations) and TiO2 nanofluids (0.2% and 0.1% concentrations). The reason for higher distillate output of MgO nanofluid over TiO2 in stepped solar still is lower specific heat capacity and higher thermal conductivity. Finally, the energy payback time was also calculated, and it was still only 3 months for stepped solar stills with the use of 0.2% nanofluid concentration.
64 citations
57 citations
TL;DR: In this paper, the detailed exergy and economic investigation of triangular pyramid solar still under passive and active mode of operation is presented, and experiments are carried out to validate the results.
Abstract: This paper presents the detailed exergy and economic investigation of triangular pyramid solar still under passive and active mode of operation. For validation, experiments were carried out...
54 citations
TL;DR: In this paper, an optimization cooling technology for improving the performance of a PV module with reflector under Egyptian conditions was determined, in which three different cooling techniques were experimentally studied as follows: use air forced cooling technology in the presence of reflectors (case-I, case-II, and case-III).
51 citations
TL;DR: In this paper, the authors present the experimental studies on the effect of mass stream rate of water (mf), phase change material and cover cooling of an inclined solar panel basin solar still (ISPBSS).
Abstract: This work presents the experimental studies on the effect of mass stream rate of water (mf), phase change material and cover cooling of an inclined solar panel basin solar still (ISPBSS). Experimental results revealed that cooling the entire surface of the glass cover of ISPBSS with fully opened flow of water produced the maximum distilled water. On varying mf, the glass temperature is higher during the minimum mf. With increased mf from 7.35 to 13.32 and from 7.35 to 17.72 kg h−1, the glass temperature is almost equivalent to the ambient temperature with fully opened flow cover cooling technique. The reduced glass temperature enhanced the rate of condensation. Similarly, the hourly instant efficiency of the ISPBSS with fully opened cover cooling is higher as compared with the similar ISPBSS without and with partially cover cooling condition. The highest hourly instantaneous efficiency of ISPBSS with partially and fully opened cover cooling is found as 85% and 88%, respectively.
44 citations
42 citations
38 citations
TL;DR: In this article, the pyramid solar still was experimentally researched on both passive and active mode and it was found that the pyramid still incorporated with the spiral tube solar water heater operated at mass flow rate of water at least amount produced the higher productivity of 6.35 kg/m2/day with the daily energy and exergy efficiency of 15.25 and 3.22%, respectively.
Abstract: 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 1 cm 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 6.35 kg/m2/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.
TL;DR: A solar still is very simple device to convert available brackish or saline water into drinkable water by use of solar energy as mentioned in this paper. But due to its lower distillate output, it is not used widely for drinking.
Abstract: A solar still is very simple device to convert available brackish or saline water into drinkable water by use of solar energy But due to its lower distillate output, it is not used widely for indu
01 Jan 2019
TL;DR: In this article, the authors studied the impact of insulation on energy and exergy effectiveness of a solar photovoltaic panel incorporated inclined solar still, focusing on the studies of the solar still performance from the different parameter such as solar still yield, thermal efficiency, exergy efficiency, solar panel electrical, ex-ergy and thermal efficiency.
Abstract: This manuscript brings out with an impact of insulation on energy and exergy effectiveness of a solar photovoltaic panel incorporated inclined solar still. This research is mainly focuses on the studies of the solar still performance from the different parameter such as solar still yield, thermal efficiency, exergy efficiency, solar panel electrical, exergy and thermal efficiency and overall daily thermal and exergy efficiency of the solar panel integrated inclined solar still. The maximum distilled water of 6.2 kg was achieved as the solar panel integrated inclined still with the bottom and the sidewall insulation. The daily yield of 3.3, 4.1 and 6.2 kg, the daily energy effectiveness of 31.32, 38.81, and 57.88 and the daily exergy effectiveness of 1.72, 2.21, and 4.61% was obtained from the solar panel integrated solar still without, with the sidewall, and with the bottom and sidewall insulation, respectively.
TL;DR: In this paper, the impact of nanofluids in the behavior of the engine fueled with waste cooking oil biodiesel (WCOBN50) using ethylene glycol as a suitable emulsifier.
Abstract: Vegetable oil is considered as one among the promising alternatives for diesel fuel as it holds properties very close to diesel fuel. However, straight usage of vegetable oil in compression ignition (CI) engine resulted in inferior performance and emission behavior. This can be improved by modifying the straight vegetable oil into its esters, emulsion, and using them as a fuel in CI engine showcased an improved engine behavior. Waste cooking oil (WCO) is one such kind of vegetable oil gained a lot of attraction globally as it is generated in a large quantity locally. The present investigation aims at analyzing various parameters of single cylinder four stroke CI engine fueled with waste cooking oil biodiesel (WCOB), waste cooking oil biodiesel water emulsion (WCOBE) while the engine is operated with a constant speed of 1500 rpm. Furthermore, an attempt is made to study the impact of nanofluids in the behavior of the engine fueled with WCOB blended with nanofluids (WCOBN50). This work also explored a novel method of producing nanofluids using one-step chemical synthesis method. Copper oxide (CuO) nanofluids were prepared by the above mentioned method and blended with waste cooking oil biodiesel (WCOBN50) using ethylene glycol as a suitable emulsifier. Results revealed that brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) of WCOBN50 are significantly improved when compared to WCOB and WCOBE. Furthermore, a higher reduction in oxides of nitrogen (NOx), carbon monoxide (CO), hydrocarbon (HC), and smoke emissions were observed with WCOBN50 on comparison with all other tested fuels at different power outputs. It is also identified that one-step chemical synthesis method is a promising technique for preparing nanofluids with a high range of stability.
TL;DR: The present data study deals with the experimental analysis of performance, emission and combustion characteristics of CI engine fuelled with corn oil methyl ester biodiesel blend as alternative fuel.
27 Feb 2019
TL;DR: In this paper, a Hybrid Metal Matrix Composite (HMMC) with Aluminium Alloy AA2219 reinforced with various weight fractions of Silicon Carbide (SiC), Aluminium Oxide (Al2O3), and Wollastonite (CaSiO3) in varying proportions to achieve better wear properties and weight reduction for applications like cast iron disc brake rotor.
Abstract: Composite materials are extensively being employed in the aerospace and automobile industries where they could have replaced conventional materials owing to their high strength/weight ratio. In this direction, research has been vigorous to help turn out composite materials of superior quality with enhanced capabilities. Hence, this paper presents an attempt at fabricating a Hybrid Metal Matrix Composite (HMMC) with Aluminium Alloy AA2219 reinforced with various weight fractions of Silicon Carbide (SiC), Aluminium Oxide (Al2O3) and Wollastonite (CaSiO3) in varying proportions to achieve better wear properties and weight reduction for applications like cast iron disc brake rotor. A two-step Stir Casting process is selected to prepare the composites. Standard Orthogonal Array is used to determine the number of experiments that need to be conducted in order to study the impact of the reinforcement materials using interaction effect plots. Pin-on-Disc wear tests and hardness tests were carried out on all the samples and the effect of the reinforcements studied from the test data. SEM is carried out on the composition with the best wear behaviour.
Journal Article•
TL;DR: In this article, Sago palm bark (SPB) is used for preparation of activated carbons (AC) using physicochemical activation techniques comprising dual carbonisation and activation phases. And the morphologies of AC surfaces were assessed via scanning-electron microscopic methods (SEM) combined with energy-dispersive X-ray spectroscopic techniques (EDX).
Abstract: Unprocessed sago palm bark (SPB) is a material that has been newly utilised for preparations of activated carbons (AC), using physicochemical activation techniques comprising dual carbonisation and activation phases. Activations have been conducted utilising three agents: sulphuric acid (H2SO4), potassium hydroxide (KOH), and zinc chloride (ZnCl2). Characterisations of the porosities of AC preparations were performed using N2 adsorption-desorption to ascertain BET and micropore surface areas as well as micropore volumes and pore-size distributions. Existing groups on the AC surfaces were resolved using Fourier Transform Infrared Spectroscopy (FTIR) analyses. The morphologies of the activated carbons were assessed via scanning-electron microscopic methods (SEM) combined with energy-dispersive X-ray spectroscopic techniques (EDX). The maximal surface areas (1639.34 m2/g), pore volume (0.649 cm3/g), micropore volume (0.335 cm3/g), and micropore surface area (1,148.58 m2/g) of the prepared AC using sago palm bark were discovered at activation temperatures of 700oC and with chemical impregnation ratios of 1.51/ zinc chloride to precursors. In the instance of KOH and H2SO4 utilisation, the surface areas of the AC preparations corresponded to 970.38 m2/g and 630.73 m2/g with pore volume of 0.458 and 0.196 cm3/g, respectively.