9.Tyco_Hydroturbines_CONTROL

9.Tyco_Hydroturbines_CONTROL - Tyco Flow Control Pacific...

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Tyco Flow Control Pacific Tyco Flow Control Pacific Search Tamar Designs Company Profile Project Work Hydro Turbines Contact Information Hydro Turbines Tamar Designs, design and manufacture Hydro Turbines for domestic, commercial and industrial applications, please select from the following links for further information on Hydro Turbines and to provide us information on your requirements: Power From Water Measuring Power Turbine Selection Speed Control Questionaire Project Work For additional information, please do not hesitate to contact us directly. Login/out | International Links | Disclaimer | Privacy & Collection | Web Master Tyco Flow Control Pacific is part of the Tyco International Ltd group. By accessing or using this website, you agree to the Terms of Use of Tyco Flow Control Pacific. ©2005 Tyco Flow Control Pacific Pty. Ltd. ABN 83 000 922 690 . All Rights Reserved . http://www.tamar.com.au/hydro_turbines [25.9.2008 0:03:07]
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Tyco Flow Control Pacific Tyco Flow Control Pacific Search Tamar Designs Company Profile Project Work Hydro Turbines Contact Information Hydro Turbines : Measuring Power Tamar Designs MEASURING YOUR POWER SOURCE Introduction: Before investing in any water power equipment, it is essential to measure your power source. You must know how much water you can deliver to the turbine and how high the water source is above the turbine. You must also know how long the penstock or feed-in pipe will be so you can calculate friction losses. "Gross head" is the vertical height from the tail water level to the intake level when the turbine is stopped. "Net head" is the head available to drive the turbine when it is running at normal full load with all losses such as pipe friction, rise in tail water level, etc. taken into account. In the case of an impulse turbine, the height of the jet centre above the tail water level must also be deducted. It is most important to distinguish between gross and nett head - with a long pipeline on a high head scheme or with a restricted tail race on a low head scheme, there may be as much as 20% difference between the gross and net heads. When measuring head, impulse and reaction turbines have to be treated differently. On a Pelton or Turgo Impulse turbine (impulse turbines) you measure to the point of entrance (or nozzle), but with Francis and Kaplan turbines (reaction turbines) you measure to the surface of the discharged water. When measuring head elevation, you need not be concerned with horizontal distances and you do not necessarily have to travel in a straight line. For heads of 10 metres or less, you must be extremely accurate. The gross head is usually measured by direct survey, and wherever possible we like to be provided with a sectional drawing showing the ground or proposed pipeline profile from head water level to tail water level. Very low head schemes of the type in which it is proposed to utilise an old water wheel pit to accomodate a turbine can frequently be surveyed by direct measurement or by use of a long straight
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This note was uploaded on 05/05/2011 for the course FC gj, taught by Professor Glokgh during the Spring '97 term at Punjab Engineering College.

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9.Tyco_Hydroturbines_CONTROL - Tyco Flow Control Pacific...

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