Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where S. Joseph Sekhar is active.

Publication


Featured researches published by S. Joseph Sekhar.


International Journal of Refrigeration-revue Internationale Du Froid | 2003

A numerical model for thermal mapping in a hermetically sealed reciprocating refrigerant compressor

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

Prediction of influence of process parameters on tensile strength of AA6061/TiC aluminum matrix composites produced using stir casting

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

Investigation on the energy and exergy efficiencies of a domestic refrigerator retrofitted with water-cooled condensers of shell-and-coil and brazed-plate heat exchangers

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

Improved energy efficiency for CFC domestic refrigerators retrofitted with ozone-friendly HFC134a/HC refrigerant mixture

S. Joseph Sekhar; D. Mohan Lal; S. Renganarayanan


Energy Conversion and Management | 2004

Ozone friendly HFC134a/HC mixture compatible with mineral oil in refrigeration system improves energy efficiency of a walk in cooler

S. Joseph Sekhar; K. Senthil Kumar; D. Mohan Lal


Energy Conversion and Management | 2014

Techno-economic studies on hybrid energy based cooling system for milk preservation in isolated regions.

M. Edwin; S. Joseph Sekhar


Applied Thermal Engineering | 2016

Performance studies on a downdraft biomass gasifier with blends of coconut shell and rubber seed shell as feedstock

V. Christus Jeya Singh; S. Joseph Sekhar


Procedia Materials Science | 2014

Characterization of Silicon Carbide Particulate Reinforced AA6061 Aluminum Alloy Composites Produced via Stir Casting

J. Jebeen Moses; I. Dinaharan; S. Joseph Sekhar


Journal of Thermal Analysis and Calorimetry | 2017

Exergy analysis of a domestic refrigerator with brazed plate heat exchanger as condenser

P. Saji Raveendran; S. Joseph Sekhar


American Journal of Applied Sciences | 2014

PERFORMANCE STUDIES ON DOWNDRAFT GASIFIER WITH BIOMASS ENERGY SOURCES AVAILABLE IN REMOTE VILLAGES

V. ChristusJeya Singh; S. Joseph Sekhar; K. Thyagarajan

Collaboration


Dive into the S. Joseph Sekhar's collaboration.

Top Co-Authors

Avatar

M. Edwin

University College of Engineering

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

A.S. Ramesh

Indian Space Research Organisation

View shared research outputs
Top Co-Authors

Avatar

I. Dinaharan

University of Johannesburg

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge