Energy System Design: A Look at Renewable Energy
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 seminar surveyer Active In SP Posts: 3,541 Joined: Sep 2010 25-09-2010, 02:05 PM Author: Dr. Taryn Bayles Abstract Here, students learn how harvesting energy from renewable sources will help meet the future needs of society. In the laboratory, the students will develop a system to store energy from a renewable source (represented in the laboratory by a light bulb, a box fan, or flowing water). The students will transport the energy, and use it to supply an electrical load (a light bulb) in a different physical location. In the process, students will learn about energy and power, and will learn about analysis of physical systems, modeling and simulation, and design under constraints. For more details CLICK HERE
 seminar class Active In SP Posts: 5,361 Joined: Feb 2011 25-03-2011, 04:08 PM PRESENTED BY: SACHIN MAHENDRU   1st.ppt (Size: 1.09 MB / Downloads: 77) DESIGN OF ENERGY SYSTEM • Streamlines • Bernoulli Equation Applications • Stagnation tube • Pitot tube • Free Jets • Orifice • Venturi • Sluice gate Sharp-crested weir • Water is flowing with a velocity of 15 m/s and under a pressure of 300 kPa .If the height above datum is 30 m .calculate Total Energy per unit weight of water • Ans 72 Nm/N • A 7.5 cm diameter hose contains water flowing at the rate of 0.085 m3 /s . If the Pressure within pipe is 70 KPa gauge ,work out the maximum height to which the water may be sprayed ? • 26.01m • A pipe 12.5 cm in diameter is used to transport oil of relative density 0.75 under a pressure of 1 bar .If the total energy relative to datum plane 2.5 m below centre of pipe is 20 Nm/N, Work out the flow rate of oil. • ANS .1074 • The rate of water through a vertical conical draft tube of a kaplon Turbine is 17.5 m3/s.The Diameter of the draft tube on the side connected to outlet of turbine runner is 2.5 m and the average velocity at exit is 1.5 m/s .if pressure at inlet is not to be less than -.7 Bar and at outlet .12 Bar .how far the tube should exrtend above tail race .presume that exit of draft tube is 1.2 m below tail level • Ans 6.595 • A horizontal water pipe of diameter 15 cm converges to 7.5 cm diameter . If the pressures at the two sections are 400 kPa and 150 Kpa calculate the flow rate of water • A pipe 12.5 cm in diameter is used to transport oil of relative density 0.75 under a pressure of 1 bar . If total energy relative to datum plane is 2.5 m below the centre of pipe is 20 Nm/N, work out the flow rate of oil. Laminar and Turbulent Flows • Critical Reynolds number (Recr) for flow in a round pipe Re < 2300 Þ laminar 2300 ≤ Re ≤ 4000 Þ transitional Re > 4000 Þ turbulent • Note that these values are approximate. • For a given application, Recr depends upon – Pipe roughness – Vibrations – Upstream fluctuations, disturbances (valves, elbows, etc. that may disturb the flow) Minor Losses • Piping systems include fittings, valves, bends, elbows, tees, inlets, exits, enlargements, and contractions. • These components interrupt the smooth flow of fluid and cause additional losses because of flow separation and mixing • We introduce a relation for the minor losses associated with these components Piping Networks and Pump Selection Two general types of networks – Pipes in series • Volume flow rate is constant • Head loss is the summation of parts – Pipes in parallel • Volume flow rate is the sum of the components • Pressure loss across all branches is the same Head Loss due to Sudden Changes in Area of Flow Sudden Expansion: The head loss at a sudden expansion is given by the expression: Sudden Contraction: The head loss at a sudden contraction is given by the expression: • At a sudden enlargement of water line from 24 cm to 48 cm diameter pipe ,the hydraulic gradient rises by 1cm .calculate the rate of Flow • A horizontal pipe ,10 cm in diameter , is joined by sudden enlargement to a 15 cm diameter pipe .Water is flowing at the rate of 2 m^3/min.Find the loss of head due to abrupt expansion and pressure difference in two pipes. If change of section is gradual without any loss, what would be change in pressure? • Oil of specific gravity 0.8 flows in a 8 cm diameter pipeline . A sudden expansion takes place into second pipeline of such diameter that maximum pressure rise is obtained .if oil flow rate through the pipeline is 12.5 litres / sec find 1. The loss of energy in sudden expansion in centimeters of oil 2. The differential gauge length indicated by an oil mercury manometer connected between two pipes • Oil of specific gravity 0.8 flows in a 8 cm diameter pipeline . A sudden expansion takes place into second pipeline of such diameter that maximum pressure rise is obtained .if oil flow rate through the pipeline is 12.5 litres / sec find 1. The loss of energy in sudden expansion in centimeters of oil 2. The differential gauge length indicated by an oil mercury manometer connected between two pipes • A 15 cm diameter pipe is attached to a 10 cm diameter pipe by means of a flange in such a manner that axes of the two are in straight line .Water flows through the arrangement at a rate of 2m^3/min The pressure loss at the transition as indicated by differential gauge length on mercury manometer connected between the two pipes equals 8 cm .calculate the head loss and coefficient of contraction • A horizontal pipeline 15 am in diameter is joined by sudden enlargement to 25 cm diameter .Measurements indicate that when flow from smaller cross section ,the head loss is 0.5 m in excess of that when flow takes place from larger to smaller section .Determine the flow rate .Take coefficient of contraction Cc =.63 • When a sudden contraction is introduced in a horizontal pipeline from 50 cm diameter to 25 cm diameter,the pressure changes from 105 kPa to 69 KPa .If coefficient of contraction is assumed to be 0.65 , calculate the water flow rate . The contraction is subsequently followed by a sudden enlargement from 25 cm section to 69 kPa ,work out the pressure at 50 cm enlarged section Take specific weight of water =10kn/m3 • When a sudden contraction is introduced in a horizontal pipeline from 50 cm diameter to 25 cm diameter, the pressure changes from 105 kPa to 69 KPa .If coefficient of contraction is assumed to be 0.65 , calculate the water flow rate . The contraction is subsequently followed by a sudden enlargement from 25 cm section to 69 kPa ,work out the pressure at 50 cm enlarged section Take specific weight of water =10kN/m3

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