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Air Flow Visualization over solar flat plate collector
Transcript of Air Flow Visualization over solar flat plate collector
Schlieren Optical Technique
Results and Conclusion
Objective Presentation Outline To study the flow visualization patterns of heat transfer processes in a Solar Flat Plate Collector using Schlieren Optical Techniques.
Introduction Solar Thermal System 1. Water heating
2. Space heating and cooling
3. Process heat generation
4. Water treatment
6. Thermal Power Generation
7. Solar Vehicles
Schlieren Optical Technique Optical methods represent an extremely versatile tool for making non-intrusive, quantitative measurements of convective heat transfer.
The Schlieren technique is based on the angular deflection undergone by a light ray when passing through a fluid region characterized by refractive index in-homogeneities. These in-homogeneities are generally caused by density or temperature variations; therefore the measured optical data can be processed in order to gain information on the density/temperature field.
Among the optical methods suitable for evaluating thermal fields, the Schlieren technique deserves attention for its relative simplicity (the equipment is straightforward to align), ease of application (little sensitivity to vibrations), low cost (expensive laser sources not required) and satisfactory accuracy of results.
Schlieren Setup Schlieren Photography Experimental Setup
A Test Cell
A Laser Gun
A Beam Expander
An Interference Filter
A CCD camera
A Knife Edge
Dr. Sunil Punjabi Submitted By
Vinay Sharma Solar technology has been harnessed by humans and is broadly characterized as either passive or active depending on the way it captures, converts and distributes solar energy.
Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Solar energy technologies include solar heating, solar thermal electricity and solar photovoltaic cells, which can make considerable contributions to solving some of the most urgent problems of the world.Intensity of solar radiation in India is approximately :500-750W/m^2 Apparatus Images A Traversing mechanism
A Halogen Array
An Auto Transformer
A Thermo sensor
Laser,Lens and Filter Project Methodology Study & Design Fabrication Experimentation Result Desired(Stop) Observations Observation 1 : Without Heating: The images captured show no or a very little movement in the air when the test cell is at room temperature. Observation 2 : With Heating: The images show a significant movement in the air when it is heated with the help of halogen array. A plum is formed whose movement increases with the increase in intensity of heat.
Observation 3: With Heating(Candle Source): The image captured movement in the air when the test cell is removed Observation : 4 Without Heating: The images captured shows incoherent source is giving more clear picture. Observation 5 : With Heating(Candle): The images captured shows movement in the air when the candle is used. Now due to alignment problems we are doing Image Processing in order to obtain result. Observation 6 : With Heating(Heated Wire): The images captured shows no or a very little movement in the air when the hot Copper wire (120 Degree Centigrade) is used. Result Based on the video footage, it is seen that we are able to trace Flow of Thermal Currents and According to the Flow we can do the necessary design modification on the Flate Plate Collector. Conclusions Drawn
Incoherent Source is Giving more accurate results
Convection Currents are now traceable. Hence design Changes can be done with the help of software and design can be optimized.
Thank You!! UEC Ujjain