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This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Noolu Mani Kumar. Peer reviewers: Noolu Mani Kumar.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 00:07, 17 January 2022 (UTC)
I believe the section called "Hydroelectricity" has been misnamed. It should be called "Hydroelectric Power," also a common term used for "Hydroelectric Power generation." In normal speaking, just; "hydroelectric," is often short for both terms. For example, see; "DINKEY CREEK HYDROELECTRIC PROJECT WATER RIGHTS DECISION." For example the first sentence is wrong: "Hydroelectricity is the application of hydropower to generate electricity." But in fact; Hydroelectric Power (generation), or just "Hydroelectric" is the application of hydropower to generate electricity (or presumably; to generate "hydroelectricity").
However, the "Hydroelectricity can also be used to store energy..." is a correct usage, electricity is electricity when it comes to the end usage. Does the word; "hydroelectricity" even exist? Both www .merriam-webster.com/dictionary/hydroelectricity and en.oxforddictionaries.com/definition/us/hydroelectric#hydroelectric go to "hydroelectric." I write more arguments, with several URLs at Talk:Hydroelectricity#Merge. Thoughts? — Preceding unsigned comment added by 2602:306:CFCE:1EE0:1D6E:AFF9:2F27:2C4F ( talk) 01:54, 21 March 2019 (UTC)
https://amp.cnn.com/cnn/2019/07/04/us/alaska-record-heat-trnd-wxc/index.html
Could one include or refer to a List of countries on their installed Hydropower versus natural capacity? Wikistallion ( talk) 09:29, 6 July 2019 (UTC)
This article was the subject of a Wiki Education Foundation-supported course assignment, between 14 January 2021 and 11 April 2021. Further details are available on the course page. Student editor(s): Kawther.H. Peer reviewers: StolteKate, MccEmma.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 22:44, 17 January 2022 (UTC)
What do other editors think of creating a section on rain as a power source? Would this be the best article for such a section (or maybe renewable energy or hydroelectricity)? Please feel to write a section on the issue using these articles or other reliable sources on the matter. Here are some sources on the issue -
Look forward to hearing from others. Helper201 ( talk) 00:30, 14 July 2021 (UTC)
So briefly, "rain power" is either just renaming of conventional hydropower in certain cases, or a non-viable "get energy from the kinetic energy of raindrops" idea which got some smoke-and-mirrors coverage and which the BBC Science Focus Magazine magazine debunked. And Wikipedia coverage of the topic informs readers of that. North8000 ( talk) 17:35, 18 July 2021 (UTC)
BTW the .001KWH BBC figure means that the one square meter collector would need to run about 1,000 years to produce $1 worth of electricity. North8000 ( talk) 09:39, 19 July 2021 (UTC)
This article was the subject of a Wiki Education Foundation-supported course assignment, between 13 January 2023 and 7 April 2023. Further details are available on the course page. Student editor(s): Ontarioeditor03 ( article contribs).
— Assignment last updated by Ontarioeditor03 ( talk) 20:00, 3 February 2023 (UTC)
How does hydropower affect our world today? How often is it used? What is it used for? TrueLightMaster123 ( talk) 19:16, 6 March 2023 (UTC)
As posted in "Calculating the amount of available power"
"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:
where
(work flow rate out) is the useful power output (SI unit: watts) ("eta") is the efficiency of the turbine (dimensionless) is the mass flow rate (SI unit: kilograms per second) ("rho") is the density of water (SI unit: kilograms per cubic metre) is the volumetric flow rate (SI unit: cubic metres per second) is the acceleration due to gravity (SI unit: metres per second per second) ("Delta h") is the difference in height between the outlet and inlet (SI unit: metres)
To illustrate, the power output of a turbine that is 85% efficient, with a flow rate of 80 cubic metres per second (2800 cubic feet per second) and a head of 145 metres (476 feet), is 97 megawatts:"
Okay, you forgot to subtract the kinetic energy of the discharge flow. For example, Hoover dam has a maximum head of 180 meters with a discharge flow of ~630 m^3/s at 140 kph. 140 kph = 38.9 m/s and using Ke = 1/2 mv^2, the discharge water needed to run the generators has a constant 1/2 * (38.9)^2 = 756 J/kg. Doing the math on the 180 meter head,
A = 9.81 m/s^2
V = At
D = 1/2 At^2 = 180 m
Solving for t, t = ((180 m) * 2 / (9.81 m/s^2)) ^ (1/2) = 6.058 seconds
V = (6.058 s) * (9.81 m / s^2) = 59.43 m/s
and Ke/kg = 1765.8 J/kg
Subtracting the discharge energy of 756 J/kg max head energy leaves 1009.8 J/kg, meaning the discharge energy is 756/1765.8 = 42.8% Unfortunately, it appears that 50% of the head divided by (100-42.8)% = 0.5 / 0.572 = 87.4% is being cited as the maximum efficiency vs the head for Hoover Dam, which is simply wrong. Like any other heat engine, the maximum efficiency is 50%, and more like near 37% as with the various other power plant types. Even with a discharge energy of 42.8%, I wouldn't expect the turbines to deliver more than that much power after losses in the pipes.
Youjaes (
talk) 08:17, 19 August 2023 (UTC)
Quote from Google search: "hydroelectric efficiency"
The efficiency of today's hydroelectric plant is about 90 percent. Hydroelectric plants do not create air pollution, the fuel--falling water--is not consumed, projects have long lives relative to other forms of energy generation, and hydroelectric generators respond quickly to changing system conditions.
Hydroelectric Power
United States Bureau of Reclamation (.gov) https://www.usbr.gov › power › edu › pamphlet — Preceding unsigned comment added by Youjaes ( talk • contribs) 08:24, 19 August 2023 (UTC)
This is the
talk page for discussing improvements to the
Hydropower article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
Archives: 1Auto-archiving period: 90 days |
This
level-3 vital article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|
This page has archives. Sections older than 90 days may be automatically archived by Lowercase sigmabot III when more than 8 sections are present. |
This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Noolu Mani Kumar. Peer reviewers: Noolu Mani Kumar.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 00:07, 17 January 2022 (UTC)
I believe the section called "Hydroelectricity" has been misnamed. It should be called "Hydroelectric Power," also a common term used for "Hydroelectric Power generation." In normal speaking, just; "hydroelectric," is often short for both terms. For example, see; "DINKEY CREEK HYDROELECTRIC PROJECT WATER RIGHTS DECISION." For example the first sentence is wrong: "Hydroelectricity is the application of hydropower to generate electricity." But in fact; Hydroelectric Power (generation), or just "Hydroelectric" is the application of hydropower to generate electricity (or presumably; to generate "hydroelectricity").
However, the "Hydroelectricity can also be used to store energy..." is a correct usage, electricity is electricity when it comes to the end usage. Does the word; "hydroelectricity" even exist? Both www .merriam-webster.com/dictionary/hydroelectricity and en.oxforddictionaries.com/definition/us/hydroelectric#hydroelectric go to "hydroelectric." I write more arguments, with several URLs at Talk:Hydroelectricity#Merge. Thoughts? — Preceding unsigned comment added by 2602:306:CFCE:1EE0:1D6E:AFF9:2F27:2C4F ( talk) 01:54, 21 March 2019 (UTC)
https://amp.cnn.com/cnn/2019/07/04/us/alaska-record-heat-trnd-wxc/index.html
Could one include or refer to a List of countries on their installed Hydropower versus natural capacity? Wikistallion ( talk) 09:29, 6 July 2019 (UTC)
This article was the subject of a Wiki Education Foundation-supported course assignment, between 14 January 2021 and 11 April 2021. Further details are available on the course page. Student editor(s): Kawther.H. Peer reviewers: StolteKate, MccEmma.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 22:44, 17 January 2022 (UTC)
What do other editors think of creating a section on rain as a power source? Would this be the best article for such a section (or maybe renewable energy or hydroelectricity)? Please feel to write a section on the issue using these articles or other reliable sources on the matter. Here are some sources on the issue -
Look forward to hearing from others. Helper201 ( talk) 00:30, 14 July 2021 (UTC)
So briefly, "rain power" is either just renaming of conventional hydropower in certain cases, or a non-viable "get energy from the kinetic energy of raindrops" idea which got some smoke-and-mirrors coverage and which the BBC Science Focus Magazine magazine debunked. And Wikipedia coverage of the topic informs readers of that. North8000 ( talk) 17:35, 18 July 2021 (UTC)
BTW the .001KWH BBC figure means that the one square meter collector would need to run about 1,000 years to produce $1 worth of electricity. North8000 ( talk) 09:39, 19 July 2021 (UTC)
This article was the subject of a Wiki Education Foundation-supported course assignment, between 13 January 2023 and 7 April 2023. Further details are available on the course page. Student editor(s): Ontarioeditor03 ( article contribs).
— Assignment last updated by Ontarioeditor03 ( talk) 20:00, 3 February 2023 (UTC)
How does hydropower affect our world today? How often is it used? What is it used for? TrueLightMaster123 ( talk) 19:16, 6 March 2023 (UTC)
As posted in "Calculating the amount of available power"
"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:
where
(work flow rate out) is the useful power output (SI unit: watts) ("eta") is the efficiency of the turbine (dimensionless) is the mass flow rate (SI unit: kilograms per second) ("rho") is the density of water (SI unit: kilograms per cubic metre) is the volumetric flow rate (SI unit: cubic metres per second) is the acceleration due to gravity (SI unit: metres per second per second) ("Delta h") is the difference in height between the outlet and inlet (SI unit: metres)
To illustrate, the power output of a turbine that is 85% efficient, with a flow rate of 80 cubic metres per second (2800 cubic feet per second) and a head of 145 metres (476 feet), is 97 megawatts:"
Okay, you forgot to subtract the kinetic energy of the discharge flow. For example, Hoover dam has a maximum head of 180 meters with a discharge flow of ~630 m^3/s at 140 kph. 140 kph = 38.9 m/s and using Ke = 1/2 mv^2, the discharge water needed to run the generators has a constant 1/2 * (38.9)^2 = 756 J/kg. Doing the math on the 180 meter head,
A = 9.81 m/s^2
V = At
D = 1/2 At^2 = 180 m
Solving for t, t = ((180 m) * 2 / (9.81 m/s^2)) ^ (1/2) = 6.058 seconds
V = (6.058 s) * (9.81 m / s^2) = 59.43 m/s
and Ke/kg = 1765.8 J/kg
Subtracting the discharge energy of 756 J/kg max head energy leaves 1009.8 J/kg, meaning the discharge energy is 756/1765.8 = 42.8% Unfortunately, it appears that 50% of the head divided by (100-42.8)% = 0.5 / 0.572 = 87.4% is being cited as the maximum efficiency vs the head for Hoover Dam, which is simply wrong. Like any other heat engine, the maximum efficiency is 50%, and more like near 37% as with the various other power plant types. Even with a discharge energy of 42.8%, I wouldn't expect the turbines to deliver more than that much power after losses in the pipes.
Youjaes (
talk) 08:17, 19 August 2023 (UTC)
Quote from Google search: "hydroelectric efficiency"
The efficiency of today's hydroelectric plant is about 90 percent. Hydroelectric plants do not create air pollution, the fuel--falling water--is not consumed, projects have long lives relative to other forms of energy generation, and hydroelectric generators respond quickly to changing system conditions.
Hydroelectric Power
United States Bureau of Reclamation (.gov) https://www.usbr.gov › power › edu › pamphlet — Preceding unsigned comment added by Youjaes ( talk • contribs) 08:24, 19 August 2023 (UTC)