S. Joseph Sekhar
Anna University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by S. Joseph Sekhar.
International Journal of Refrigeration-revue Internationale Du Froid | 2003
B. Raja; S. Joseph Sekhar; D. Mohan Lal; A. Kalanidhi
In a refrigerant compressor, improvement in performance such as reduction of various electrical and mechanical losses, reduction of gas leakage, better lubrication, reduction of suction gas heating etc. can be achieved by maintaining a low temperature rise inside the compressor. Proper selection and location of an internal over load protector relay, estimation of heat transfer coefficient and winding insulation coefficient are also vital in enhancing the performance. In this context it is necessary to understand the temperature distribution inside a compressor for an optimal design. In this paper, a numerical model has been created and a heat transfer analysis for a hermetically sealed reciprocating refrigerant compressor is presented. The temperature distribution inside the compressor has been obtained taking into consideration the various heat sources and sinks and compared with experimental results. The maximum temperature was observed at the rotor which was 427.5 K. The deviation of the predicted rotor temperature from that of experimental value is 5.5% only. A good agreement was found between experimental results and that predicted in the numerical analysis.
Transactions of Nonferrous Metals Society of China | 2016
J. Jebeen Moses; I. Dinaharan; S. Joseph Sekhar
Abstract Stir casting was used to produce AA6061/15%TiC (mass fraction) aluminum matrix composites (AMCs). An empirical relationship was developed to predict the effect of stir casting parameters on the ultimate tensile strength (UTS) of AA6061/TiC AMCs. A central composite rotatable design consisting of four factors and five levels was used to minimize the number of experiments, i.e., castings. The factors considered were stirring speed, stirring time, blade angle and casting temperature. The effect of those factors on the UTS of AA6061/TiC AMCs was derived using the developed empirical relationship and elucidated using microstructural characterization. Each factor significantly influenced the UTS. The variation in the UTS was attributed to porosity content, cluster formation, segregation of TiC particles at the grain boundaries and homogenous distribution in the aluminum matrix.
Journal of Thermal Analysis and Calorimetry | 2018
P. Saji Raveendran; S. Joseph Sekhar
Domestic refrigerator is one of the major energy-consuming appliances, and the enhancement of its energy efficiency plays a vital role in implementing the energy conservation policies and green building concepts in residential sector. The major strategies used to improve the performance of domestic refrigerators are the replacement of existing components, use of alternative refrigerants and the reduction in condensing pressure. Therefore, in this work, the conventional air-cooled condenser has been replaced with water-cooled condensers such as shell-and-coil and brazed-plate heat exchangers to maintain a low compression ratio and condensing pressure. The performance of a domestic refrigeration system retrofitted with water-cooled condensers has been studied using experimental methods. The result showed that the system with water-cooled condensers reduces the pull-down time and the per day energy consumption by 70% and 3.5%, respectively. Moreover, the proposed system can improve the COP and exergy efficiency by 6.4% and 4.9%, respectively. Compared to shell-and-coil heat exchanger, the system with brazed-plate heat exchanger can reduce irreversibility and TEWI by 3.9% and 3.7%, respectively. In this study, the system with brazed-plate heat exchanger showed better performance than the shell-and-coil heat exchanger for all operating conditions.
International Journal of Thermal Sciences | 2004
S. Joseph Sekhar; D. Mohan Lal; S. Renganarayanan
Energy Conversion and Management | 2004
S. Joseph Sekhar; K. Senthil Kumar; D. Mohan Lal
Energy Conversion and Management | 2014
M. Edwin; S. Joseph Sekhar
Applied Thermal Engineering | 2016
V. Christus Jeya Singh; S. Joseph Sekhar
Procedia Materials Science | 2014
J. Jebeen Moses; I. Dinaharan; S. Joseph Sekhar
Journal of Thermal Analysis and Calorimetry | 2017
P. Saji Raveendran; S. Joseph Sekhar
American Journal of Applied Sciences | 2014
V. ChristusJeya Singh; S. Joseph Sekhar; K. Thyagarajan