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Reddy N.J.M.,Chaitanya Bharathi Institute of Technology
Frontiers in Energy | Year: 2016

There has been an immense endeavor to mitigate global warming in spite of which it has only been worse. This paper presents the design and implementation of a low power and eco-friendly refrigeration system using the thermoelectric effect. The conventional refrigerators make use of complex mechanisms which involves synchronous operation of various units, namely the compressor, condensers, expansion valves, evaporator, refrigerant and so on. But a thermoelectric refrigerator exploits the principle of the Peltier effect, thus avoiding the utilization of these complex components. This even helps curb the release of harmful chlorofluorocarbons (CFCs) into the atmosphere which contributes to the increase in global temperature. Moreover, the temperature can be controlled and set to required values with the help of a microcontroller. Hence, this can be used both for domestic and commercial purposes. The unit does not eject any harmful gases. Therefore, the heat expelled from the unit can be tapped for heating utilities, making the use of this device versatile in its application. Thus this proposal aims not only at reducing the air pollutants by not contributing to it but also at reducing the power consumption. © 2015, Higher Education Press and Springer-Verlag Berlin Heidelberg. Source

Linga Reddy B.,Chaitanya Bharathi Institute of Technology
International Journal of Pharmacy and Technology | Year: 2014

Synthesis of mesoporous silica SBA-15 has been demonstrated by using copolymer as structural directing agent (SDA). The prepared materials are showing applications in which efficient diffusion of molecules is in demand. © 2014, International Journal of Pharmacy and Technology. All rights reserved. Source

Reddy P.R.,Chaitanya Bharathi Institute of Technology
International Journal of Precision Engineering and Manufacturing | Year: 2012

Metal cutting processes involve interaction of the machining forces with the work piece. In this processes the vibrations are induced in machine tools which have adverse effect on tool life, surface integrity and occurrence of undesirable chatter phenomenon. In order to enhance the quality of surface of the work piece after machining and avoid chatter marks and breakage of tool, this paper gives a unique method to detect and suppress the chatter effect on the work piece finis. This method incorporates the features of Magneto-Rheological fluid which utilizes the input current as source to modify the magnetic field to enhance the variable stiffness and produce damping effect to control the end mill cutter vibration and suppress the chatter. The variables stiffness and damping can be maintained by the damper input current to attain desired magnetic field in the MR damper. In this work the chatter detection is observed by means of a remarkable Bingham number. The different machining parameters are considered in the experimental work and the results are compared with and without the magneto rheological damping effect and the results shows the enhancement of surface quality and reduced the chatter marks on the work piece by producing Magneto- Rheological damping to the end mill cutter during machining. © KSPE and Springer 2012. Source

Reddy Y.S.,Chaitanya Bharathi Institute of Technology
Acta Physica Polonica A | Year: 2016

The polycrystalline bulk samples of R0:67Sr0:33MnO3 (R = Pr, Nd, Gd) were prepared by solid state reaction method and characterized by powder X-ray diffraction. The room temperature elastic behavior of these materials was investigated by employing ultrasonic pulse transmission technique at 1 MHz. The values of elastic constants were computed from longitudinal and shear velocities. The measured values were corrected to zero porosity using Hasselman and Fulrath's formulae. The variation of elastic moduli with the size of rare earth ion is interpreted in terms of strength of interatomic bonding. Source

Murali Krishna M.V.S.,Chaitanya Bharathi Institute of Technology | Kishor K.,Chaitanya Bharathi Institute of Technology | Murthy P.V.K.,Vivekananda Institute of Science and Information Technology | Gupta A.V.S.S.K.S.,University of Hyderabad | Narasimha Kumar S.,Chaitanya Bharathi Institute of Technology
Renewable and Sustainable Energy Reviews | Year: 2012

Aim: Investigations were carried out to evaluate the performance of a two-stroke, single cylinder, spark ignition (SI) engine, with alcohol blended gasoline (80% gasoline, 20% methanol by vol; 80% gasoline and 20% ethanol by volume) having copper coated engine [CCE, copper-(thickness, 300 μm) coated on piston crown, inner side of cylinder head] provided with catalytic converter with sponge iron as catalyst and compared with conventional SI engine (CE) with pure gasoline operation. Study design: Performance parameters of brake thermal efficiency, exhaust gas temperature and volumetric efficiency were determined at various values of brake mean effective pressure (BMEP). Methodology: A microprocessor-based analyzer was used for the measurement of carbon monoxide (CO) and un-burnt hydro carbons (UBHC) in the exhaust of the engine at various values of BMEP. Aldehydes were measured by dinitrophenyl hydrazine (DNPH) method at peak load operation of the engine. Brief results: CCE with alcohol blended gasoline considerably reduced pollutants in comparison with CE with pure gasoline operation. Catalytic converter with air injection significantly reduced pollutants with test fuels on both configurations of the engine. Gasohol improved the performance of the both versions of the engine in comparison with methanol blended gasoline. On the other hand, methanol blended gasoline effectively reduced the emissions when compared with gasohol in both versions of the engine. © 2012 Elsevier Ltd. Source

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