Hydropower

"Hydraulic power" redirects here. For power from hydraulic fluid, see Fluid power.
The Three Gorges Dam in China; the hydroelectric dam is the world's largest power station by installed capacity.
Saint Anthony Falls, United States; hydropower was used here to mill flour.

Hydropower or water power (from the Greek: ύδρω, "water" ) is power derived from the energy of falling water or running water, which may be harnessed for useful purposes. Since ancient times, hydropower from many kinds of watermills has been used as a renewable energy source for irrigation and the operation of various mechanical devices, such as gristmills, sawmills, textile mills, trip hammers, dock cranes, domestic lifts, and ore mills.

Since the early 20th century, the term has been used almost exclusively in conjunction with the modern development of hydroelectric power. Another method used to transmit energy is by using a trompe, which produces compressed air from falling water. Compressed air could then be piped to power other machinery at a distance from the waterfall.

International institutions such as the World Bank view hydropower as a means for economic development without adding substantial amounts of carbon to the atmosphere,[1] but in some cases dams cause significant social or environmental issues.[2]

History

Kaptai Dam located in Bangladesh

In India, water wheels and watermills were built; in Imperial Rome, water powered mills produced flour from grain, and were also used for sawing timber and stone; in China, watermills were widely used since the Han dynasty In China and the rest of the Far East, hydraulically operated "pot wheel" pumps raised water into irrigation canals.

In the Middle Ages, Islamic mechanical engineer Al-Jazari invented designs for 100 hydraulic devices in his book, The Book of Knowledge of Ingenious Mechanical Devices, including water wheel designs that rival designs of even the 21st century. He took a particular interest in pumping water to other regions, and because of this he created several "scooping" designs that were designed to employ buckets, cranks, and cogs to lift water up from rivers.[3]

In 1753, French engineer Bernard Forest de Bélidor published Architecture Hydraulique which described vertical- and horizontal-axis hydraulic machines. By the late 19th century, the electric generator was developed and could now be coupled with hydraulics.[4] The growing demand for the Industrial Revolution would drive development as well.[5]

The power of a wave of water released from a tank was used for extraction of metal ores in a method known as hushing. The method was first used at the Dolaucothi Gold Mines in Wales from 75 AD onwards, but had been developed in Spain at such mines as Las Médulas. Hushing was also widely used in Britain in the Medieval and later periods to extract lead and tin ores. It later evolved into hydraulic mining when used during the California Gold Rush.

At the beginning of the Industrial Revolution in Britain, water was the main source of power for new inventions such as Richard Arkwright's water frame.[6] Although the use of water power gave way to steam power in many of the larger mills and factories, it was still used during the 18th and 19th centuries for many smaller operations, such as driving the bellows in small blast furnaces (e.g. the Dyfi Furnace)[7] and gristmills, such as those built at Saint Anthony Falls, which uses the 50-foot (15 m) drop in the Mississippi River.

In the 1830s, at the early peak in U.S. canal-building, hydropower provided the energy to transport barge traffic up and down steep hills using inclined plane railroads. As railroads overtook canals for transportation, canal systems were modified and developed into hydropower systems; the history of Lowell, Massachusetts is a classic example of commercial development and industrialization, built upon the availability of water power.[8]

Technological advances had moved the open water wheel into an enclosed turbine or water motor. In 1848 James B. Francis, while working as head engineer of Lowell's Locks and Canals company, improved on these designs to create a turbine with 90% efficiency. He applied scientific principles and testing methods to the problem of turbine design. His mathematical and graphical calculation methods allowed confident design of high efficiency turbines to exactly match a site's specific flow conditions. The Francis reaction turbine is still in wide use today. In the 1870s, deriving from uses in the California mining industry, Lester Allan Pelton developed the high efficiency Pelton wheel impulse turbine, which utilized hydropower from the high head streams characteristic of the mountainous California interior.

Hydraulic power-pipe networks

Hydraulic power networks used pipes to carrying pressurized water and transmit mechanical power from the source to end users. The power source was normally a head of water, which could also be assisted by a pump. These were extensive in Victorian cities in the United Kingdom. A hydraulic power network was also developed in Geneva, Switzerland. The world famous Jet d'Eau was originally designed as the over-pressure relief valve for the network.[9]

Compressed air hydro

See also: Trompe

Where there is a plentiful head of water it can be made to generate compressed air directly without moving parts. In these designs, a falling column of water is purposely mixed with air bubbles generated through turbulence or a venturi pressure reducer at the high level intake. This is allowed to fall down a shaft into a subterranean, high-roofed chamber where the now-compressed air separates from the water and becomes trapped. The height of falling water column maintains compression of the air in the top of the chamber, while an outlet, submerged below the water level in the chamber allows water to flow back to the surface at a lower level than the intake. A separate outlet in the roof of the chamber supplies the compressed air. A facility on this principle was built on the Montreal River at Ragged Shutes near Cobalt, Ontario in 1910 and supplied 5,000 horsepower to nearby mines.[10]

Hydropower types

Main article: Hydroelectricity

Hydropower is used primarily to generate electricity. Broad categories include:

Calculating the amount of available power

A hydropower resource can be evaluated by its available power. Power is a function of the hydraulic head and rate of fluid flow. The head is the energy per unit weight (or unit mass) of water. The static head is proportional to the difference in height through which the water falls. Dynamic head is related to the velocity of moving water. Each unit of water can do an amount of work equal to its weight times the head.

The power available from falling water can be calculated from the flow rate and density of water, the height of fall, and the local acceleration due to gravity. In SI units, the power is:

P=\eta\rho\,Qgh\!

where

To illustrate, power is calculated for a turbine that is 85% efficient, with water at 1000 kg/cubic metre(62.5 pounds/cubic foot) and a flow rate of 80 cubic-meters/second(2800 cubic-feet/second), gravity of 9.81 metres per second squared and with a net head of 145 m (480 ft).

In SI units:

\text{Power (W)} = 0.85\times 1000 \times 80 \times 9.81 \times 145 which gives 97 MW

In English units, the density is given in pounds per cubic foot so acceleration due to gravity is inherent in the unit of weight. A conversion factor is required to change from foot lbs/second to kilowatts:

\text{Power (W)} = 0.85\times 62.5 \times 2800 \times 480 \times 1.356 which gives 97 MW (130,000 horsepower)

Operators of hydroelectric stations will compare the total electrical energy produced with the theoretical potential energy of the water passing through the turbine to calculate efficiency. Procedures and definitions for calculation of efficiency are given in test codes such as ASME PTC 18 and IEC 60041. Field testing of turbines is used to validate the manufacturer's guaranteed efficiency. Detailed calculation of the efficiency of a hydropower turbine will account for the head lost due to flow friction in the power canal or penstock, rise in tail water level due to flow, the location of the station and effect of varying gravity, the temperature and barometric pressure of the air, the density of the water at ambient temperature, and the altitudes above sea level of the forebay and tailbay. For precise calculations, errors due to rounding and the number of significant digits of constants must be considered.

Some hydropower systems such as water wheels can draw power from the flow of a body of water without necessarily changing its height. In this case, the available power is the kinetic energy of the flowing water. Over-shot water wheels can efficiently capture both types of energy.

The water flow in a stream can vary widely from season to season. Development of a hydropower site requires analysis of flow records, sometimes spanning decades, to assess the reliable annual energy supply. Dams and reservoirs provide a more dependable source of power by smoothing seasonal changes in water flow. However reservoirs have significant environmental impact, as does alteration of naturally occurring stream flow. The design of dams must also account for the worst-case, "probable maximum flood" that can be expected at the site; a spillway is often included to bypass flood flows around the dam. A computer model of the hydraulic basin and rainfall and snowfall records are used to predict the maximum flood.

See also

References

  1. ↑ Howard Schneider (8 May 2013). "World Bank turns to hydropower to square development with climate change". The Washington Post. Retrieved 9 May 2013.
  2. ↑ Nikolaisen, Per-Ivar . "12 mega dams that changed the world (in Norwegian)" In English Teknisk Ukeblad, 17 January 2015. Retrieved 22 January 2015.
  3. ↑ Al-Hassani, Salim. "800 Years Later: In Memory of Al-Jazari, A Genius Mechanical Engineer". Muslim Heritage. The Foundation for Science, Technology, and Civilisation. Retrieved 30 April 2015.
  4. ↑ "History of Hydropower". U.S. Department of Energy.
  5. ↑ "Hydroelectric Power". Water Encyclopedia.
  6. ↑ Kreis, Steven (2001). "The Origins of the Industrial Revolution in England". The history guide. Retrieved 19 June 2010.
  7. ↑ Gwynn, Osian. "Dyfi Furnace". BBC Mid Wales History. BBC. Retrieved 19 June 2010.
  8. ↑ "Waterpower in Lowell" (PDF). University of Massachusetts. Retrieved 28 April 2015.
  9. ↑ Jet d'eau (water foutain) on Geneva Tourism
  10. ↑ Maynard, Frank (November 1910). "Five thousand horsepower from air bubbles". Popular Mechanics: 633.

External links

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