IMPACT : International Journal of Research in Engineering & Technology

Number 5-7, 2017

1-10
Maintenance and Retrofitting Basic Trainer R12 To Hidro Carbon

Authors: Edie Sasito Sarwodidoyo

Abstract

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Number of views: 1185

ABSTRACT Maintenance and Retrofitting always busy to be the subject of discussion because the topic is related to the replacement of refrigrant materials, Although it will not replace materials and tools but in terms of his refrigeration science many interesting things. In terms of basic sciences the working principle of the system is still fixed, only the refrigerant is changed. In fact, there can be no changes in components and equipment. The existence of compressors, condensers, evaporators, and expansion valves still exist. In the case of retrofitting carried out as the initial determination is refrigerant R12 and in its place is refigerant Hydro Carbon In case retrofiting is treated as the initial determination is refrigerant R12 and its replacement is refigerant Hydro Carbon (HC). It is found that the Coeffisient of Performance COP R12 refrigerant is still higher than COP Hydrocarbon, but the refrigerant HC is more economical (the use of refrigerant and electric power is cheaper)

11-18
Design and Performance Evaluation of Direct Mode Solar Dryer

Authors: Chendake A. D, Patil S. B, Mane S. S, Anuse P. A, Ghadge S. B, Nalawade R. T & Shete A. A

Abstract

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Number of views: 697

ABSTRACT Now a day, drying becomes one of the important post harvest operation for fruits, to increase shelf life. Sun drying is one of the oldest, but the cheapest and widely used methods. So the Direct Mode Solar Dryer is constructed and investigated experimentally, for the drying efficiency at a geographic location of Talsande, in the city of Kolhapur. The highest daily solar radiation, obtained at 12:00 p.m. was 857 W/m2. The highest ambient temperature was obtained at 12:00 p.m. i.e., 39.8ºC as well as the highest inside temperature was obtained at 13:30 p.m. & 14:30 pm i.e., 74.5ºC. The maximum temperature difference ΔT was observed, i.e., 40.5°C at 14:00 p.m. The time required to dry sapota from moisture content i.e., 52.38% to 2.22% is 9 hrs. The maximum efficiency of the dryer was obtained at 61.61%, for drying of sapota.

19-26
A Comparative Investigation of 5-Level, 9-Level and 11-Level Conventional Cascaded H-Bridge Multilevel Inverters by Using Simulink/Matlab

Authors: Dodda Satish Reddy, Biks Alebachew Taye, Diress Tilahun Antalem & Ch Krishna Prasad

Abstract

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Number of views: 1439

ABSTRACT This paper aims to extend the knowledge about the performance of different Cascade H-Bridge multilevel inverters (CHB-MLI) through harmonic analysis. Large utility applications require advanced power electronics converter to meet the high power demands. As a result, multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations. A multilevel converter not only achieves high power ratings, but also improves the performance of the whole system in terms of harmonics, dv/dt stresses, and stresses in the bearings of a motor. Multilevel inverters are becoming more popular in the power conversion systems for high power and power quality demanding applications. The MATLAB based simulation on SIMULINK platform is presented for Cascade H-Bridge multilevel inverter (CHB-MLI) topology of Single Phase cascaded H-bridge Multilevel Inverter for 5, 9, and 11-levels. A detailed comparison of Cascade H-Bridge multilevel inverters (CHB-MLI) are presented in the paper based on number of power devices used, Total Harmonic Distortion.

27-30
Studies on Properties of Polypropylene Filled Sebs/Mica/Silica Blends (Foamed/Unfoamed) For Automotive Application

Authors: HarekrishnaPanigrahi, M.P Singh & AvinashNathTiwari

Abstract

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Number of views: 740

ABSTRACT The purpose of this work is to compare the effects of different types of filler (silica, mica) loadings and elastomeric content on interfacial properties, morphology and mechanical properties of polypropylene blends modified by 5, 10, 15, and 20 Vol % of poly (styrene-b-ethylene-co-butylene-b-styrene) SEBS added to the total blend volume. We considered the effect of foamed and informed blends properties to understand how the changes occur between adhesion, the filler and the matrix. The blends samples were homogenized in a twin screw extruder. The compatibility of PP and fillers focused on this study and further the foaming nature. The morphology of ternary polymer blends revealed by light and scanning electron microscope was compared with morphology predicted models based on interfacial properties. The results indicated that the general morphology of blends systems was determined primarily by interfacial properties, whereas the spherulitic morphology of the polypropylene matrix was a result of two competing effects: nucleation effect of filler and solidification effect of elastomer. Tensile and impact strength properties were mainly influenced by combining competitive effects of stiff filler and tough SEBS elastomer. Spherulitic morphology of the polypropylene matrix might have affected some mechanical properties additionally.

31-36
A Study of Authorship Patterns and Collaborative Research in Planner, 2010-2016

Authors: Jyotirmay Sarkar

Abstract

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Number of views: 433

ABSTRACT This paper presents a bibliometric study of PLANNER (Promotion of Library Automation and Networking in North Eastern Region) during the period of 2010-2016. It is a series of conventions and has completed 10th convention last year (2016). This paper deals with 7th, 8th, 9th and 10th conventions; those are organized in 2010, 2012, 2014 and 2016, respectively. A total of 187 research contributions and 362 others were examined by growth of contributions by year, growth of authors by year, authorship patterns, author productivity and degree of collaboration. Average number of authors per paper is 1.936. The highest number of author productivity, i.e., 0.517. The average degree of author collaborated in this study is 0.690, which clearly indicates its dominance upon multi authored contributions.

37-44
Information and Communication Technologies in India: A Review

Authors: C. Srikanth & A.Usha Rani

Abstract

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Number of views: 559

ABSTRACT This article discusses the development of Information and Communication Technologies (ICT) in libraries. This Article highlights the use of ICT services for the Library Oriented Services like Internet, E-Resources, RFID, etc.. Types of networking used in libraries. In addition, it incorporates details on major Library Automation Software in India. This Article concludes with the impact of revolutionary developments in Information &Communication Technology.

45-50
Study of the Natural Convection in a Cavity Equipped with a Heating Plate Inside

Authors: Merabti Ahmed, Salima Laoufi & Farhat Benabderrahmane

Abstract

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Number of views: 370

ABSTRACT The transfer of heat into a square cavity due to a thin heated plate, was studied numerically for hot plate placed vertically / horizontally. The movement of the flow in the cavity depends on the heating plate itself. The effect of position and aspect ratio of hot plate on heat transfer and circulation was addressed.

51-58
Natural Ventilation in a Room by a Composite Wall

Authors: Merabti Ahmed & Djakani Omar

Abstract

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Number of views: 383

ABSTRACT In recent years, a considerable research effort has been devoted to the study of heat transfer induced by natural convection within a cavity. The interest in these phenomena of natural convection is due to the numerous potential applications in engineering. These applications include the extraction of geothermal energy, dispersion of pollutants in aquifers, safety problems in the core of nuclear reactors, and thermal building. In recent years, natural ventilation, similar to the phenomenon of the natural convection of living quarters, is approached numerically using primarily the CFD code. It is in this context that our study is located and wants an additional contribution and which is centered around the modeling and the simulation by finite volumes of a system of natural ventilation of a room in a region arid by a composite wall Used in the ventilation system or the passive heating of buildings (analysis of the natural convection phenomena). The results are presented in the form of temperature fields and current lines for Rayleigh number 105, air flow mass and local and average Nusselt numbers.

59-64
Thermal Confort Enhancementin A Habitat IsolatedFromthe Roof by a Porous Media

Authors: Merabti Ahmed, MehdaouiRazli, Elmir Mohamed &BenabderrahmaneFarhat NAAS Rating: 2.73- Articles can be sent to editor@impactjournals.us Figure 1 :Problem Geometry THE INFLUENCE OF POROSITY To describe the effect of the Rayleigh Ra number on the flow structure and heat transfer, the following parameters:(h, H, L, Ep) Mathematical Formulation Fluid area . (1) (2) (3) (4) Porous area (5) (6) (7) (8) RESULTS AND DISCUSSIONS Current Lines and Isotherms The lines of currents shown in (FIG. 2) Show that for the small values of Ra, a single celloccupies the entire enclosure, the

Abstract

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Number of views: 405

ABSTRACT The large share of energy consumed for the heating or cooling of buildings has led researchers to address the issue of heat exchange between premises and the environment. Since Much of the heat loss occurs through the roof, insulating materials slow down heat Transfer through the building envelope. The quality of the insulation required depends on the climate, the exposure of the roofs and also the materials used for the construction. The choice of a material used as insulation depends naturally on its availability and cost. In this study, we propose to analyze the heat Transfer in a ceiling-insulated building by a porous medium (glass wool), based on the effect of the Rayleigh number on the heat exchange between the Building and the outside environment. For this purpose, a Comsol multiphysics software based on the finiteelementmethodis used to solve the equationsgoverning heat transfer in the fluid medium as well as the porous medium. The resultswillbe in the form of currentlines, isotherms, temperature profiles and Nuseltnumbers..

65-70
The Influence of Porosity on Thermal Comfort in an Isolated Habitat of the Roof by a Porous Medium

Authors: Merabti Ahmed, MehdaouiRazli, Elmir Mohamed & BenabderrahmaneFarhat

Abstract

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Number of views: 459

ABSTRACT The large share of energy consumed for the heating or cooling of buildings has led researchers to address the issue of heat exchange between the premises and the environment. Since much of the heat loss occurs through the roof, insulating materials slow down heat transfer through the building envelope. The quality of the insulation required depends on the climate, the exposure of the roofs and also the materials used for the construction. The choice of a material used as insulation depends naturally on its availability and cost. In this study, we propose to analyze the heat transfer in a ceiling-insulated building by a porous medium (glass wool), based on the effect of porosity on the heat exchange of the building and the external environment. For this purpose, Multiphysics-based Comsol software based on the finite element method was used to solve the equations governing heat transfer in the fluid medium as well as the porous medium. The results will be in the form of current lines, isotherms, temperature profiles and Nuselt numbers