Pumps as Turbines

A users guide

By: Arthur Williams

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Paperback | 15 December 2003 | Edition Number 2

At a Glance

Paperback
82 Pages

Edition Type
Revised

Dimensions(cm)
20.9 x 15.1 x 0.5

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This second edition of the classic title on practical energy provision for isolated houses and remote locations has now been updated with a new chapter. Pumps as Turbine is a practical handbook for engineers and technicians involved in designing and installing small water-power schemes. It concerns the use of standard pump units as a low-cost alternative to conventional turbines to provide stand-alone electricity generation for isolated houses and remote communities. This second edition has been updated and extended to include a case study from a recent scheme installed in collaboration with ITDG Kenya. The pump selection process is described through this step-by-step example, where the site head would have been too low for a Pelton turbine. The case study demonstrates that now, possibly more than ever before, the use of pumps as turbines offers a reliable, low-cost option for rural electrification. Arthur Williams has been involved in micro-hydro research and development since 1987. While completing his PhD he worked with ITDG to set up successful pump-as-turbine demonstration schemes in the UK and Pakistan. He is now a senior lecturer at the Nottingham Trent University where he continues to work on micro- and pico-hydro power.

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Foreword	p. v
Acknowledgements	p. vi
Introduction	p. vii
Diagram of Pump Components	p. x
Applications for pumps as turbines	p. 1
Why use a pump as a turbine?	p. 2
Using a direct drive pump as turbine	p. 2
Suitable range of site heads and flows	p. 3
Overcoming the limitations of using a pump as turbine	p. 6
Choice of pump type	p. 8
Pump types and suitability	p. 8
Choice of pump quality	p. 11
Choice of pump seal type	p. 13
Choice of pump speed	p. 14
Understanding pump sizes	p. 14
Pump and turbine performance curves	p. 16
Understanding pump as pump performance curves	p. 16
Obtaining the best efficiency point with limited data	p. 20
Understanding pump as turbine performance curves	p. 20
Design of the civil works	p. 23
Intake requirements	p. 23
Design of penstock	p. 24
Valves	p. 26
Pump as turbine outlet	p. 27
Design of the electrical system	p. 28
Choice of generator type and number of phases	p. 28
Generator speeds	p. 29
Control of the electrical output	p. 31
Selecting a pump as turbine for a particular site	p. 33
Matching a pump as turbine to site conditions	p. 33
Test procedure	p. 36
Checking generator power output	p. 38
Operation of a pump as turbine	p. 40
Operation of a pump as turbine at site	p. 40
Adjustments to a pump as turbine after installation	p. 43
Scheme case studies	p. 45
The civil works	p. 46
Selecting the pump	p. 47
Specifying the generator	p. 49
Installation, testing and modification	p. 51
Case study in Karnataka, India	p. 52
Appendices
Pump as turbine operation at reduced flow	p. 55
Parallel operation of pumps as turbines	p. 56
Syphon intake for intermittent operation	p. 59
Typical efficiencies of induction motors	p. 60
Unit conversion for head and flow	p. 61
Estimating pump performance from physical measurements	p. 62
Calculating safe wall thickness for steel pipe	p. 65
Selecting penstock diameter and calculating head loss	p. 66
Further Reading	p. 68
Index	p. 69
Table of Contents provided by Ingram. All Rights Reserved.

Pumps as Turbines

A users guide

At a Glance

Paperback

Shipping

How to return your order

Defective items

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