i-manager's Journal on Mechanical Engineering (JME)


Volume 5 Issue 4 August - October 2015

Research Paper

Development of Solar Powered Vapour Absorption Refrigeration System

Prasanthi* , J. Chandrakala**
* Professor, Department of Mechanical Engineering, JNTUA College of Engineering, Ananthapuramu, Andhra Pradesh, India.
** PG Research Scholar, Department of Mechanical Engineering, JNTUA College of Engineering, Ananthapuramu, Andhra Pradesh, India.
Prasanthi, G., and Chandrakala,J. (2015). Development of Solar Powered Vapour Absorption Refrigeration System. i-manager’s Journal on Mechanical Engineering, 5(4), 1-6. https://doi.org/10.26634/jme.5.4.3615

Abstract

The continuous increase in the cost and demand for energy has led to more research and development to utilize available energy resources efficiently by minimizing waste energy. Absorption refrigeration systems increasingly attract research interests [15]. Vapour Absorption Refrigeration System (VARS) offers the possibility of using heat to provide cooling. The Vapour absorption refrigeration system utilizing solar energy would generally be more efficient. For this purpose, heat from conventional boiler can be used or waste heat and solar energy. Absorption system falls into two categories depending upon the working fluid. These are the LiBr-H2O and NH3-H2O Absorption Refrigeration system. In LiBr-H2O system, water is used as a refrigerant and Li-Br is used as an absorbent, while in NH3-H2O system ammonia is used as an refrigerant and water is used as an absorbent, which served as standard for comparison in studying and developing new cycles and new absorbent/refrigerant pairs. Many researchers have studied the solar absorption refrigeration system in order to make it economically and technically available. But still, much more research in this area is needed. This paper will help many researchers working in this area and provide them with fundamental knowledge on absorption systems, and a detailed review on the past efforts in the field of solar absorption refrigeration systems with the absorption pair of ammonia and water. This knowledge will help them to start the parametric study in order to develop new refrigeration systems with the help of solar energy.

Research Paper

Evaluation of Geometrical Behavior of Laminated Graphite/Epoxy Composite using FEM

Yenda Kesava Rao* , Ch.Siva RamaKrishna**, Saineelkamal Arji***
* PG Student, Department of Machine Design, Vignan's Institute of Information Technology, Visakhapatnam, Andhra Pradesh, India.
** Associate Professor, Department of Mechanical Engineering, Vignan's Institute of Information Technology, Visakhapatnam, Andhra Pradesh, India.
*** Assistant Professor, Vignan's Institute of Information Technology, Visakhapatnam, Andhra Department of Mechanical Engineering, Pradesh, India.
Rao, Y. K., Ramakrishna, S., and Arji, S. (2015). Evaluation of Geometrical Behavior of Laminated Graphite/Epoxy Composite using FEM. i-manager’s Journal on Mechanical Engineering, 5(4), 7-18. https://doi.org/10.26634/jme.5.4.3616

Abstract

Laminated composite plate structures finds numerous applications in aerospace, military and automotive industries. The role of transverse shear is very important in composites, as the material is weak in shear due to its low shear modulus compared to extensional rigidity. Hence, an accurate understanding of their structural behaviour is required, such as deflections and stresses. In this paper, a number of Finite Element Analysis (FEA) have been carried out for various side-tothickness ratios and modulus ratios to study the effect of transverse shear deformation on deflection and stresses of laminated composite plates subjected to tensile load. The FEM results showed on the deflections and stresses, that the effect of coupling is to decrease the deflections with the increase in the modulus ratio and change in the stresses with the increase in the side-to-thickness ratio.

Research Paper

Efficiency Improvement Opportunities of Unorganized Manufacturing Sector Using 5S Methodology

Rohit K. Kandpal*
*PG Student, Department of Manufacturing Engineering and Management, G.B.Pant University of Agriculture and Technology, Uttrakhand, India.
Kandpal, R. K. (2015). Efficiency Improvement Opportunities of Unorganized Manufacturing Sector Using 5s Methodology. i-manager’s Journal on Mechanical Engineering, 5(4), 19-26. https://doi.org/10.26634/jme.5.4.3617

Abstract

In this research work, a literature review was conducted by scanning the literature review of last 10 years. The literature review indicates that, the size of the unorganized manufacturing sector is very large with reference to its contribution in Indian economy and generated employment in the country. At the same time this sector is identified as a significant source of different types of wastes due to its ill articulated working. This research work is being taken up to identify the opportunities of efficiency improvement of India's unorganized manufacturing sector by the application of 5S methodology. As a result of comparison of organized and unorganized manufacturing sector, some facts were identified; in which unorganized manufacturing sector needs a considerable improvement as compared to the organized manufacturing sector. On the basis of this research work, it can be concluded that the size of the unorganized manufacturing sector is very huge from the point of view of turnover and its contribution to the Indian economy and manpower employed by the sector. It is necessary to understand, if the authors improve the energy efficiency by the infinitesimal amount of unorganized sector that may contribute equivalent to installation of mega power plant in the country. There is a scope of doing, a multiple of such infinitesimal improvements in energy efficiency and transportation system in the Indian unorganized manufacturing sector.

Research Paper

Optimization of Coating Parameters of Flame Spraying using Taguchi based Grey Relational Analysis

Ajay Malik* , Hari Singh**, Satya Prakash***
* Assistant Professor, University Institute of Engineering and Technology, Kurukshetra University, Haryana, India.
** Professor, National Institute of Technology, Kurukshetra, Haryana, India.
*** Professor, Indian Institute of Technology, Roorkee, Uttarakhand, India.
Malik, A., Singh, H., and Prakash, S. (2015). Optimization of Coating Parameters of Flame Spraying using Taguchi based Grey Relational Analysis. i-manager’s Journal on Mechanical Engineering, 5(4), 27-34. https://doi.org/10.26634/jme.5.4.3618

Abstract

Flame spraying has emerged as the most promising technique among all thermal spraying techniques for depositing a higher quality abradable coating. The present work deals with a statistical design of experimental study of flame spraying Metco 301NS powder. The choice of the optimum coating parameters plays an important role in the quality of the coating, the coating cost and increasing the lifetime of the coated parts. Coating experiments were performed with a Taguchi (L8) design to optimize the flame spray process parameters. In this study, the influence of the different coating variables like oxygen, acetylene, rpm, coating angle and spray distance on various performance features such as hardness, roughness, porosity and thickness were evaluated. The attributes of the coating were correlated with the change in the parameters and their relative importance, contribution ratios and total variance were calculated using the Taguchi method. Since the thermal spray coating is a multiple feature technique, a multi objective optimization technique, Grey Relational Analysis (GRA), was used to optimize the process parameters. The investigation revealed the optimal combination of process parameters for oxygen (40 L/min), dissolved acetylene (50 L/min), rpm (4), spray angle (60 degree) and spray distance (7 inch). The results were verified through confirmation tests.

Review Paper

A Comprehensive Review of Biodiesel Application in IDI Engines with Property Improving Additives

Aditya kolakoti* , B. V. A. Rao**
* Research Scholar, Department of Marine Engineering, Andhra University College of Engineering, Visakhapatnam, India.
** Professor, Department of Marine Engineering, Andhra University College of Engineering, Visakhapatnam, India.
Kolakoti, A., and Rao, B. V. A. (2015). A Comprehensive Review of Biodiesel Application in IDI Engines with Property Improving Additives. i-manager’s Journal on Mechanical Engineering, 5(4), 35-45. https://doi.org/10.26634/jme.5.4.3619

Abstract

Rapidly increasing consumption of fossil fuel and petroleum products has been a matter of concern for the many countries which import crude oil. This is at the expense of huge foreign exchange on one hand and increasing tailpipe emissions on the other hand. Therefore, it is necessary to investigate about renewable energy sources. Among the biomass resources, biodiesel offers a very promising alternative to diesel oil. It is renewable, and has similar or better properties. Biodiesel commands crucial advantages such as technical feasibility of blending in any ratio with petroleum diesel fuels. Extensive research and demonstration projects have shown that, it can be used pure or in blends with conventional diesel fuel in unmodified diesel engines. This paper presents the results of wider experimental campaign carried out on IDI engine by various authors and aimed at evaluating the overall performance, emissions and the combustion trends. Experimental results with different fuels like neat biodiesel, blends of biodiesel –diesel & biodiesel - additive combinations have been discussed in detail.