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Pandit, A. B.
- Thermal Energy Storage: Its Prospects of Demand Side Energy Management
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Thermal Energy Storage (TES) technology addresses critical power demand caused by Air conditioning systems, a single largest contributor to electrical peak demand and Building's energy cost. TES technology stores "cooling" energy in thermal storage mass during off-peak hours when energy cost and demand is low and supplies it during Peak hours when energy cost and demand is high. TES is proven method of reducing peak power demand and energy conservation which leads to the conservation of conventional energy resources and reduces carbon emission for Sustainable Development. TES through Demand Side Management programmes avoids the "On Peak" energy generation, reduces additional strain on Transmission & Distribution infrastructure. TES improves system Load Factor and Diversity Factor for optimum and economic operation of power system. Potential study of peak power demand reduction, possible methods and policies of TES penetration in metro city like Mumbai are discussed in this paper. TES can be a win-win situation for owners, DISCOMs and Environment.
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International Journal of Innovative Research and Development, Vol 1, No 7Sp (2012), Pagination: 277-286Abstract
Constrained conditions of commercial energy supply and availability; widening of the gap in Demand & Supply has become a major issue. To bridge the gap, Energy efficiency and savings programmes would be better alternative as a resource over the addition of generation capacity. Energy demand in commercial Buildings, Complexes & Offices is rapidly increasing hence effective Energy Efficiency programmes need to be adopted in 'Building sector'. In India this sector has about 25% of total electricity demand.Thermal Energy Storage (TES) technology addresses critical power demand caused by Air conditioning systems, a single largest contributor to electrical peak demand and Building's energy cost. TES technology stores "cooling" energy in thermal storage mass during off-peak hours when energy cost and demand is low and supplies it during Peak hours when energy cost and demand is high. TES is proven method of reducing peak power demand and energy conservation which leads to the conservation of conventional energy resources and reduces carbon emission for Sustainable Development. TES through Demand Side Management programmes avoids the "On Peak" energy generation, reduces additional strain on Transmission & Distribution infrastructure. TES improves system Load Factor and Diversity Factor for optimum and economic operation of power system. Potential study of peak power demand reduction, possible methods and policies of TES penetration in metro city like Mumbai are discussed in this paper. TES can be a win-win situation for owners, DISCOMs and Environment.
Full Text
- Computation of Erosion Potential of Cavitation Bubble in an Ultrasonic Pressure Field
Abstract Views :196 |
PDF Views:3
Authors
Affiliations
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 39, No 2 (2017), Pagination: 60-69Abstract
Cavitation is the creation and collapse of a vapor cavity in a liquid. Cavitation can be produced by a sound field and this principle is employed in the ultrasonic vibratory cavitation device. The rapidly fluctuating applied pressure results in cavitation of the liquid. The pressure produced by the collapse of a vapor bubble can be determined by solving equations of bubble dynamics. The fundamental equation of bubble dynamics is the Rayleigh-Plesset- Noltingk-Neppiras-Poritsky equation popularly known as the RP equation. This equation does not account for the effect of liquid compressibility. Gilmore's equation, which considers liquid compressibility, can be used to obtain realistic estimates of bubble wall velocities at the end of bubble collapse. This paper discusses the numerical solution of Gilmore's equation to evaluate the bubble wall velocity at the end of bubble collapse and the pressure imposed on a solid surface from impingement of the resulting jet. The parameters affecting the growth and collapse of a single bubble is are studied. A discussion of results of cavitation damage experiments in sodium is also provided as a confirmation of the theoretical estimate of damage.Keywords
Ultrasonic Cavitation, Gilmore's Equation, Collapse Pressure.Full Text
References
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- Plesset M.S., The dynamics of cavitation bubbles, ASME J. Appl. Mech., 71(1949) 277-282.
- Noltingk B.E. and Neppiras E.A., Cavitation produced by ultrasonics, Proc. Phys. Soc. Sec. B, 63 (1950) 674-685.
- Poritsky H., The collapse and growth of a spherical bubble or cavity in a viscous fluid. In Proc. 1st U.S. National Congress on Applied Mechanics (ed. E. Sternberg), New York, NY: American Society of Mechanical Engineers, (1952) pp. 813–821.
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- Sreedhar B.K, Albert S.K. and Pandit A.B., Cavitation damage: Theory and measurements – A review, Wear, 372-373 (2017) 177-196.
- Design and Analysis of Ultrasonic Horn for Cavitation Generation in Liquid Sodium
Abstract Views :156 |
PDF Views:0
Authors
Affiliations
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, HBNI, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, HBNI, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 39, No 4 (2017), Pagination: 127-131Abstract
A vibratory cavitation device is commonly used in the laboratory to study cavitation erosion damage of materials in liquids. These devices are designed and operated in conformance with ASTM-G32 code. The main component of this device is the horn which is used to generate cavitation in the test liquid. The horn operates at ultrasonic frequency and is powered by a piezoelectric crystal driven by an ultrasonic generator. This paper discusses the analysis and design of an ultrasonic horn operating at 20 kHz with peak to peak displacement amplitude of 50 microns at the free end. The free end of the horn is immersed in liquid sodium. The material selection and design of the horn is carried out for a maximum temperature of 550°C. The horn is also provided with features to facilitate sealing of the vessel containing the test liquid (sodium) while ensuring that the necessary amplitude is obtained at the free end without unduly stressing the horn. The analysis is carried out using FEM software and the results are compared with the measured values.Keywords
Cavitation, Vibratory Device, Ultrasonic Horn.Full Text
References
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- Mathias T. L., Specimen design for fatigue testing at very high frequencies, J. Sound Vib. 247(4) (2001) 673-681.
- Seah K. H. W., Wong Y. S. and Lee L. C., Design of tool holders for ultrasonic machining using FEM, J. Mat. Proces. Tech. 37 (1993) 801-816.
- Sohar C. R., Betzwar-kotas A., Gierl C., Weiss B. and Danninger H., Gigacycle fatigue behavior of chromium alloyed cold worked tool steel. Int. J. Fatigue, 30 (2008) 1137-1149.
- ANSYS Documentation Release 17.2, element reference for BEAM188.