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Babu, Art
- Characterisation Studies on SnO2 Thin Film Coatings over Solar Cells
Authors
1 Mechanical Engineering Department, Sanketika Institute of Technology and Management, Visakhapatnam-530041, IN
Source
Indian Journal of Innovations and Developments, Vol 6, No 1 (2017), Pagination: 1-8Abstract
Objective: To improve the reutilisation of heat lost due to convection from the cell to ambient air. For this purpose, initially parameter like efficiency of cell with tin oxide coating and fill factor of cell with tin oxide coating for various cross sections are envisaged.In the later stages the heat lost due to convection in predicted from the transient analysis on single cell considering it as a flat plate collector.
Methods/Statistical analysis: Experiments are conducted to apply a thin film-coating layer of tin oxide on solar cells (silicon wafers) by a thermal vapour process under high vacuum, followed by annealing with an objective of reducing the reflection.Theoretical analysis is carried out on single solar cell and on an array of cells (solar collector) to assess quantitatively the convection heat loss rate to the ambient air during the process of heat absorption by the cells.
Findings: The tests conducted with the nano-coated solar cells showed that the cell efficiency has increased from 24% without coating to 31% with an optimum coating 400 nm thicknesses has been found. The results of the theoretical analysis conducted on a single cell reveal a 2% saving in the heat loss from the cell with nano-coating compared to that without coating. As the coating thickness is increased from zero to 600nm the heat loss due to convection decreased monotonically from 461.4 to 452 W/m2.
Application/Improvements:These thin films can be used in various applications like gas sensors, solar cell and sensors.
Keywords
SnO2, Thin Film Coatings, Solar Cells, Thermal Analysis and Experimental Analysis.Full Text
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- Design Analysis of 4-Strokepetrol Engine Composite Cylinder
Authors
1 Mechanical Dept, Welfare College, 530049, IN
2 Mechanical Dept., Sanketika Institute of Technology and Management, PM Palem, 530041, IN
Source
Indian Journal of Innovations and Developments, Vol 8, No 6 (2019), Pagination: 1-6Abstract
Background/Objectives: The work is to optimize the weight to power ratio of an internal combustion engine. So as to achieve the desired result we have considered a composite cylinder.
Methods/Statistical analysis: A cylinder with composite material is assigned as Aluminum alloy LM13 & Magnesium alloy AZ91D by varying thickness of internal cylinder-115x120x200mm dimensions. Outer core material is assigned as cast iron with dimensions120x200mm with 5mm thickness. Considering HERO SPLENDER PLUS specifications i.e., single cylinder 4 stroke SI engine is considered as standard model for design calculations and dimensional aspects in this project the 3D model of cylinder with varying cross sections is done in CATIA. The 3D model is saved as .igs file and imported to Ansys, thermal analysis module.
Findings: The analysis is carried out. Assuming boundary conditions as 600° C at inner surface of internal cylinder, ambient conditions are considered at outer surface and convection coefficient h is 5 watt /mm2 Optimization is done by varying the thickness and material properties of internal cylinder material. Due to which reduce weight to power ratio resulting in producing high specific power and good mileage Aluminum alloy LM13 is best suitable.
Improvements/Applications: The best suitable application is in automotive industry, pressure vessels and hydraulic mechanisms.
Keywords
Composite Cylinder, Aluminum Alloy LM13, Magnesium Alloy AZ91D.Full Text
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