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Chandrashekar, T. K.
- Optimization Lithium Bromide (LiBr)–Water Absorption Refrigration using Taguchi for Low Capacity
Authors
1 Department of Thermal Engineering, SSIT, Tumkur – 572105, Karnataka, IN
2 Department of Mechanical Engineering, MITE, Mangalore – 574225, Karnataka, IN
3 Department of Mechanical Engineering, AMCEC, Bangalore – 560011, Karnataka, IN
Source
Indian Journal of Science and Technology, Vol 9, No 45 (2016), Pagination:Abstract
The study attempts to optimize the parameters for LiBr –water absorption refrigeration system using Taguchi. The investigation was carried out to optimize the Coefficient of Performance (COP) for heat removal of 100W. The three factors considered were: Generator Temperature (Tg), Condenser Temperature (Tc), Absorber Temperature (Ta), Evaporator Temperature (Te). at three different levels. The L9 orthogonal array was selected and the best optimum conditions were identified based on Signal to Noise (S/N ratio) ratio, under the clause: larger is the best. The results showed generator temperature contribution is more on COP.Keywords
LiBr-H2O, COP, Taguchi.- A New Method to Determine the Concentration for LiBr Solution in Vapor Absorption Refrigeration System
Authors
1 Department of Mechanical Engineering, SSIT, Tumkur, Karnataka, IN
2 Department of Mechanical Engineering, MITE, Tumkur, Karnataka, IN
3 Department of Mechanical Engineering, AMCE, Bangalore, Karnataka, IN
Source
International Journal of Innovative Research and Development, Vol 5, No 11Sp (2016), Pagination: 62-64Abstract
The growth in industrialization and improvement in the science technology has developed a new system for the sophistication for the mankind. According to ASHRAE reported more than 50% of the generated power is consumed by the refrigeration and Air-conditioning systems. This resulted in the energy crisis and attributed to development novel systems like vapour absorption refrigeration system. LiBr-H2O (Lithium Bromide-water) vapour absorption refrigeration system showed the promising solution because it uses heat energy to run the system and also it uses natural refrigerant as water due to this there is no detrimental effect on the environment. The key components of this system are generator and absorber and there it is necessary to maintain required concentrations if not resulting in scaling in the line. The literature review showed that, conventional methods are used to determine the concentration. In this regard, the paper attempts to develop the new method to measure the concentration quickly, accurately and at low cost by using conductivity under ambient conditions. The results showed the accuracy in the measurement on compared with conventional method.
Keywords
Lithium Bromide, Concentration, Heat Pump, Conductivity.- Enhancement of Heat Transfer Characteristics of Plain Fin Coated With Graphene Nanoparticle
Authors
1 Department of Mechanical Engineering, Mangalore Institute of Technology and Engineering, Moodbidri - 574225, Karnataka, India;, IN
2 Department of Mechanical Engineering, RNS Institute of Technology, Bangalore – 560098, Karnataka, India, IN
3 School of Mechanical Engineering, KLE Technological University, BVB Campus, Hubballi – 580031, Karnataka, India., IN
4 Department of Mechanical Engineering, Channabasaveshwara Institute of Technology, Gubbi - 572216, Karnataka, India ., IN
5 Centre of Excellence in Material Science, KLE Technological University, BVB Campus, Hubballi - 580031, Karnataka, India ., IN
Source
Journal of Mines, Metals and Fuels, Vol 70, No 12 (2022), Pagination: 656 - 664Abstract
Improving the cooling performance of electronic devices and engines, unlike is an important area that is being investigated by several investigators. Poor performance of conventional cooling methods has necessitated enhancing heat transfer by using different fins with different configurations. Further various thin film coatings on fins using different nano-particles of silver, copper and carbon-based materials like Graphene, Multi Walled Carbon Nanotubes (MWCNTs) and their benefits in enhancing heat transfer have been reported in the literature. This work involves highlights on heat transfer characteristics of heat sinks having different shapes such as copper concave, aluminium congruent and copper flat plate. These differently shaped heat sinks were subsequently coated with graphene nanoparticles and their effect on heat transfer characteristics is studied. The outcomes obtained from the experimental forced convection are used to compare the heat transfer characteristics for different heat sinks with and without nano-coating. The experiment is conducted for varied voltage inputs and the heat dissipation is compared. Different parameters like surface temperature, Nusselt number, Reynolds number, and effectiveness are compared for different heat sinks with and without nano-coating. Experimental analysis showed that for a constant voltage input of 100V, copper concave, aluminium congruent and copper flat plate-shaped heat sinks with graphene coating showed higher heat transfer coefficients which more by 45.35%, 40.64%, and 21.43% when compared to those without the coating. Also, the Nusselt number increased by 9.9%, 13.9% and 40% accompanying a decrease in thermal resistance by 40%, 30.9% and 30.36% with respect to those without the coating. The copper concave-shaped heat sink, with graphene nano-coating exhibited a higher heat transfer coefficient, higher Nusselt number and decreased thermal resistance compared to that without coating and hence can be used in electronic elements for greater heat dissipation.Keywords
Fins, Fin Configuration, Graphene, Heat Sink, Heat Transfer Characteristics, Thin Film CoatingReferences
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