Efficiency - Revision history

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energy>Ethan.boechler at 16:30, 13 September 2021

2021-09-13T16:30:28Z

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			[[fr:Rendement]]
	[[File:MWtMWe.png\|350px\|thumb\|Figure 1. The power input in a heat engine is measured as [[MWt]], and the output power obtained as electricity is measured as [[MWe]].<ref>''Made internally by a member of the Encyclopedia team''</ref> The ratio of power out over power in is the efficiency.]]		[[File:MWtMWe.png\|350px\|thumb\|Figure 1. The power input in a heat engine is measured as [[MWt]], and the output power obtained as electricity is measured as [[MWe]].<ref>''Made internally by a member of the Encyclopedia team''</ref> The ratio of power out over power in is the efficiency.]]

Jmdonev: 1 revision imported

2020-04-28T15:32:37Z

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energy>Jmdonev at 21:53, 10 April 2020

2020-04-10T21:53:06Z

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	[[category:371 topics]]		[[category:371 topics]]
	[[File:MWtMWe.png\|350px\|thumb\|Figure 1. The power input in a heat engine is measured as [[MWt]], and the output power obtained as electricity is measured as [[MWe]].<ref>''Made internally by a member of the Encyclopedia team''</ref> The ratio of power out over power in is the efficiency.]]		[[File:MWtMWe.png\|350px\|thumb\|Figure 1. The power input in a heat engine is measured as [[MWt]], and the output power obtained as electricity is measured as [[MWe]].<ref>''Made internally by a member of the Encyclopedia team''</ref> The ratio of power out over power in is the efficiency.]]
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	This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].		This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].

	"Efficiency" is often confused with "effectiveness", and the two should be recognized as distinct from one another when analyzing [[energy system]]s. Energy efficiency measures how much a system is getting out of the [[fuel]] or [[flow]] it is using. If the energy system is effective, it is making use of this energy towards the right goal. For example, a car is a very effective form of [[transportation]], since it is able to move people across long distances and to specific places. However, a car may not transport people very efficiently because of how it uses fuel.<ref>Diffen, ''Effectiveness vs Efficiency'' [Online], Available: http://www.diffen.com/difference/Effectiveness_vs_Efficiency</ref>		"Efficiency" is often confused with "effectiveness", and the two should be recognized as distinct from one another when analyzing [[energy system]]s. Energy efficiency measures how much a system is getting out of the [[fuel]] or [[primary energy flow]] it is using. If the energy system is effective, it is making use of this energy towards the right goal. For example, a car is a very effective form of [[transportation]], since it is able to move people across long distances and to specific places. However, a car may not transport people very efficiently because of how it uses fuel.<ref>Diffen, ''Effectiveness vs Efficiency'' [Online], Available: http://www.diffen.com/difference/Effectiveness_vs_Efficiency</ref>

	==Types of Efficiency==		==Types of Efficiency==
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	==Implications==		==Implications==

	Efficiency is used to describe the energy that a certain system can extract and make useful from its energy source. Such systems include [[power plant]]s, [[engine]]s, and [[turbine]]s. ''Any'' system that uses energy from a [[fuel]] or [[flow]] has a certain efficiency associated with it.		Efficiency is used to describe the energy that a certain system can extract and make useful from its energy source. Such systems include [[power plant]]s, [[engine]]s, and [[turbine]]s. ''Any'' system that uses energy from a [[fuel]] or [[primary flow]] has a certain efficiency associated with it.

	The efficiency of [[coal]] and [[natural gas]] power plants range between 32% to 42%.<ref>Bright Hub Engineering, ''The Efficiency of Power Plants of Different types'' [Online], Available: http://www.brighthubengineering.com/power-plants/72369-compare-the-efficiency-of-different-power-plants/</ref> If a [[power plant]] has an efficiency of 35% then for every 100 [[joule\|J]] of heat from coal, about 35 J becomes electricity and the other 65 J becomes [[heat]]. This heat goes into making the [[atmosphere]] warmer, or perhaps a body of [[water]] like a river or lake.		The efficiency of [[coal]] and [[natural gas]] power plants range between 32% to 42%.<ref>Bright Hub Engineering, ''The Efficiency of Power Plants of Different types'' [Online], Available: http://www.brighthubengineering.com/power-plants/72369-compare-the-efficiency-of-different-power-plants/</ref> If a [[power plant]] has an efficiency of 35% then for every 100 [[joule\|J]] of heat from coal, about 35 J becomes electricity and the other 65 J becomes [[heat]]. This heat goes into making the [[atmosphere]] warmer, or perhaps a body of [[water]] like a river or lake.
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	[[Cogeneration]] plants make use of [[waste heat]] in power plants and other heat systems (like a car's engine running a [[heater]]) in order to power other parts of the system, thereby making the total efficiency higher.<ref>Forbes, ''The Most Efficient Power Plants'' [Online], Available: http://www.forbes.com/2008/07/03/energy-efficiency-cogeneration-biz-energy_cx_jz_0707efficiency_horror.html</ref>		[[Cogeneration]] plants make use of [[waste heat]] in power plants and other heat systems (like a car's engine running a [[heater]]) in order to power other parts of the system, thereby making the total efficiency higher.<ref>Forbes, ''The Most Efficient Power Plants'' [Online], Available: http://www.forbes.com/2008/07/03/energy-efficiency-cogeneration-biz-energy_cx_jz_0707efficiency_horror.html</ref>

			==For Further Reading==
			*[[Second law of thermodynamics]]
			*[[Conservation of energy]]
			*[[Energy transformations]]
			*[[Cogeneration]]
			*[[Carnot efficiency]]
			*Or explore a [[Special:Random\|random page]]

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

Jmdonev: 1 revision imported

2018-05-11T18:17:07Z

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Jmdonev at 22:08, 9 May 2018

2018-05-09T22:08:44Z

← Older revision		Revision as of 22:08, 9 May 2018
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	[[Category:Done ~~2017~~-07-01]]		[[Category:Done 2018-04-30]]
	[[category:371 topics]]		[[category:371 topics]]
	[[File:MWtMWe.png\|350px\|thumb\|Figure 1. The power input in a heat engine is measured as [[MWt]], and the output power obtained as electricity is measured as [[MWe]].<ref>''Made internally by a member of the Encyclopedia team''</ref> The ratio of power out over power in is the efficiency.]]		[[File:MWtMWe.png\|350px\|thumb\|Figure 1. The power input in a heat engine is measured as [[MWt]], and the output power obtained as electricity is measured as [[MWe]].<ref>''Made internally by a member of the Encyclopedia team''</ref> The ratio of power out over power in is the efficiency.]]

	~~As is often the case in science, words that~~ have ambiguous meanings in everyday language have precise meanings in science. <onlyinclude>'''Efficiency''' in physics (and often for chemistry) is a comparison of the [[energy]] output to the energy input in a given [[system]].</onlyinclude> It is defined as the [[percent]]age ratio of the output energy to the input energy, given by the equation:		A word can have multiple and ambiguous meanings in everyday language but they have precise meanings in science. <onlyinclude>'''Efficiency''' in physics (and often for chemistry) is a comparison of the [[energy]] output to the energy input in a given [[system]].</onlyinclude> It is defined as the [[percent]]age ratio of the output energy to the input energy, given by the equation:

	<center><math>Efficiency = \frac{E_{out}}{E_{in}}\times 100\%</math></center>		<center><math>Efficiency = \frac{E_{out}}{E_{in}}\times 100\%</math></center>
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	This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].		This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].

	"Efficiency" is often confused with "effectiveness", and the two should be recognized as distinct from one another analyzing [[energy system]]s. Energy efficiency measures how much a system is getting out of the [[fuel]] or [[flow]] it is using. If the energy system is effective, it is making use of this energy towards the right goal. For example, a car is a very effective form of [[transportation]], able to move people across long distances and to specific places, ~~but~~ a car may not transport people very efficiently because of how it uses fuel.<ref>Diffen, ''Effectiveness vs Efficiency'' [Online], Available: http://www.diffen.com/difference/Effectiveness_vs_Efficiency</ref>		"Efficiency" is often confused with "effectiveness", and the two should be recognized as distinct from one another when analyzing [[energy system]]s. Energy efficiency measures how much a system is getting out of the [[fuel]] or [[flow]] it is using. If the energy system is effective, it is making use of this energy towards the right goal. For example, a car is a very effective form of [[transportation]], since it is able to move people across long distances and to specific places. However, a car may not transport people very efficiently because of how it uses fuel.<ref>Diffen, ''Effectiveness vs Efficiency'' [Online], Available: http://www.diffen.com/difference/Effectiveness_vs_Efficiency</ref>

	==Types of Efficiency==		==Types of Efficiency==
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	===Electricity Transmission Efficiency===		===Electricity Transmission Efficiency===

	[[Electricity]] tends to lose energy in the [[electrical grid]] as it is transmitted from one location to another, depending on the magnitude of [[current]], the specific [[conductor]]s, and the length of the [[electrical transmission\|transmission]] line. As [[voltage]]s increase these losses are reduced considerably due to its relationship with current. Typical losses from a [[power plant]] to a user in their home ranges from 8% to 15%.<ref>IEC, ''EFFICIENT ELECTRICAL ENERGY TRANSMISSION AND DISTRIBUTION'' [Online], Available: http://www.iec.ch/about/brochures/pdf/technology/transmission.pdf</ref>		[[Electricity]] tends to lose energy in the [[electrical grid]] as it is transmitted from one location to another, depending on the magnitude of [[electric current]], the specific [[conductor]]s, and the length of the [[electrical transmission\|transmission]] line. As [[voltage]]s increase these losses are reduced considerably due to its relationship with current. Typical losses from a [[power plant]] to a user in their home ranges from 8% to 15%.<ref>IEC, ''EFFICIENT ELECTRICAL ENERGY TRANSMISSION AND DISTRIBUTION'' [Online], Available: http://www.iec.ch/about/brochures/pdf/technology/transmission.pdf</ref>

	===Wind Turbine Efficiency===		===Wind Turbine Efficiency===
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	Efficiency is used to describe the energy that a certain system can extract and make useful from its energy source. Such systems include [[power plant]]s, [[engine]]s, and [[turbine]]s. ''Any'' system that uses energy from a [[fuel]] or [[flow]] has a certain efficiency associated with it.		Efficiency is used to describe the energy that a certain system can extract and make useful from its energy source. Such systems include [[power plant]]s, [[engine]]s, and [[turbine]]s. ''Any'' system that uses energy from a [[fuel]] or [[flow]] has a certain efficiency associated with it.

	The efficiency of [[coal]] and [[natural gas]] power plants range between 32% to 42%.<ref>Bright Hub Engineering, ''The Efficiency of Power Plants of Different types'' [Online], Available: http://www.brighthubengineering.com/power-plants/72369-compare-the-efficiency-of-different-power-plants/</ref> If a [[power plant]] has an efficiency of 35% then, for every 100 [[joule\|J]] of heat from coal, ~~only~~ about 35 J ~~become~~ electricity, the other 65 J ~~become~~ [[heat]]. This heat goes into making the [[atmosphere]] warmer, or perhaps a body of [[water]] like a river or lake.		The efficiency of [[coal]] and [[natural gas]] power plants range between 32% to 42%.<ref>Bright Hub Engineering, ''The Efficiency of Power Plants of Different types'' [Online], Available: http://www.brighthubengineering.com/power-plants/72369-compare-the-efficiency-of-different-power-plants/</ref> If a [[power plant]] has an efficiency of 35% then for every 100 [[joule\|J]] of heat from coal, about 35 J becomes electricity and the other 65 J becomes [[heat]]. This heat goes into making the [[atmosphere]] warmer, or perhaps a body of [[water]] like a river or lake.

	This isn't a failure of engineering, but rather a limit imposed by [[thermodynamics]], with the maximum efficiency of such plants given by the [[Carnot efficiency]]. The lower the efficiency of such plants ~~are~~, the more detrimental the effects of it are on the [[environment]] as more of these fuels need to be used in order to fulfill energy needs. The ability to increase efficiency is a topic with ongoing research, primarily due to the fact that the ability to increase efficiency will lessen environmental impacts of energy use and reduce [[resource]] needs in the future. Along with efficiency, it is important for both the environment and for people's health that the right fuels are [[access to non-solid fuel\|accessible]].		This isn't a failure of engineering, but rather a limit imposed by [[thermodynamics]], with the maximum efficiency of such plants given by the [[Carnot efficiency]]. The lower the efficiency of such plants, the more detrimental the effects of it are on the [[environment]] as more of these fuels need to be used in order to fulfill energy needs. The ability to increase efficiency is a topic with ongoing research, primarily due to the fact that the ability to increase efficiency will lessen environmental impacts of energy use and reduce [[resource]] needs in the future. Along with efficiency, it is important for both the environment and for people's health that the right fuels are [[access to non-solid fuel\|accessible]].

	[[Cogeneration]] plants ~~can~~ make use of [[waste heat]] in power plants and other heat systems (like a car's engine running a [[heater]]) in order to power other parts of the system, thereby making the total efficiency higher.<ref>Forbes, ''The Most Efficient Power Plants'' [Online], Available: http://www.forbes.com/2008/07/03/energy-efficiency-cogeneration-biz-energy_cx_jz_0707efficiency_horror.html</ref>		[[Cogeneration]] plants make use of [[waste heat]] in power plants and other heat systems (like a car's engine running a [[heater]]) in order to power other parts of the system, thereby making the total efficiency higher.<ref>Forbes, ''The Most Efficient Power Plants'' [Online], Available: http://www.forbes.com/2008/07/03/energy-efficiency-cogeneration-biz-energy_cx_jz_0707efficiency_horror.html</ref>

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

Jmdonev: 1 revision imported

2017-08-29T01:47:28Z

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Jmdonev at 21:17, 17 August 2017

2017-08-17T21:17:15Z

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	~~As is often the case in science, words that have ambiguous meanings in everyday language have precise meanings in science~~. ~~<onlyinclude>'''Efficiency'''~~ in ~~physics (and often for chemistry)~~ is ~~a comparison of the~~ [[~~energy~~]] output ~~to the energy input in a given~~ [[~~system~~]].</~~onlyinclude~~> ~~It is defined as the percentage~~ ratio of the ~~output energy to the input energy, given by the equation:~~		[[File:MWtMWe.png\|350px\|thumb\|Figure 1. The power input in a heat engine is measured as [[MWt]], and the output power obtained as electricity is measured as [[MWe]].<ref>''Made internally by a member of the Encyclopedia team''</ref> The ratio of power out over power in is the efficiency.]]

	<center><m>Efficiency = \frac{E_{out}}{E_{in}}*100\%</~~m> </onlyinclude~~></center>		As is often the case in science, words that have ambiguous meanings in everyday language have precise meanings in science. <onlyinclude>'''Efficiency''' in physics (and often for chemistry) is a comparison of the [[energy]] output to the energy input in a given [[system]].</onlyinclude> It is defined as the [[percent]]age ratio of the output energy to the input energy, given by the equation:

			<center><math>Efficiency = \frac{E_{out}}{E_{in}}\times 100\%</math></center>

	This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].		This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].

J.williams: 1 revision imported

2015-09-18T16:51:38Z

1 revision imported

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Jmdonev at 20:57, 3 September 2015

2015-09-03T20:57:31Z

← Older revision		Revision as of 20:57, 3 September 2015
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	[[Category:Done 2015-06~~-01~~]]		[[Category:Done 2015-09-06]]
	[[category:371 topics]]		[[category:371 topics]]
	As is often the case in science, words that have ambiguous meanings in everyday language have precise meanings in science. <onlyinclude>'''Efficiency''' in physics (and often for chemistry) is a comparison of the [[energy]] output to the energy input in a given system.</onlyinclude> It is defined as the percentage ratio of the output energy to the input energy, given by the equation:		As is often the case in science, words that have ambiguous meanings in everyday language have precise meanings in science. <onlyinclude>'''Efficiency''' in physics (and often for chemistry) is a comparison of the [[energy]] output to the energy input in a given [[system]].</onlyinclude> It is defined as the percentage ratio of the output energy to the input energy, given by the equation:

	<center><m>Efficiency = \frac{E_{out}}{E_{in}}*100\%</m> </onlyinclude></center>		<center><m>Efficiency = \frac{E_{out}}{E_{in}}*100\%</m> </onlyinclude></center>
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	This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].		This equation is commonly used in order to represent energy in the form of [[heat]] or [[power]].

	"Efficiency" is often confused with "effectiveness", and the two should be recognized as distinct from one another analyzing [[energy system]]s. Energy efficiency measures how much a system is getting out of the [[fuel]] or [[flow]] it is using. If the energy system is effective, it is making use of this energy towards the right goal. For example, a car is a very effective form of transportation, able to move people across long distances and to specific places, but a car may not transport people very efficiently because of how it uses fuel.<ref>Diffen, ''Effectiveness vs Efficiency'' [Online], Available: http://www.diffen.com/difference/Effectiveness_vs_Efficiency</ref>		"Efficiency" is often confused with "effectiveness", and the two should be recognized as distinct from one another analyzing [[energy system]]s. Energy efficiency measures how much a system is getting out of the [[fuel]] or [[flow]] it is using. If the energy system is effective, it is making use of this energy towards the right goal. For example, a car is a very effective form of [[transportation]], able to move people across long distances and to specific places, but a car may not transport people very efficiently because of how it uses fuel.<ref>Diffen, ''Effectiveness vs Efficiency'' [Online], Available: http://www.diffen.com/difference/Effectiveness_vs_Efficiency</ref>

	==Types of Efficiency==		==Types of Efficiency==
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	===Wind Turbine Efficiency===		===Wind Turbine Efficiency===

	[[Wind turbine]]s are limited to a maximum theoretical efficiency of 59.3%, which is known as the Betz ~~Limit~~.<ref>WindPower program, ''The Betz limit'' [Online], Available: http://www.wind-power-program.com/betz.htm</ref> This law is derived by a conservation analysis of mass and momentum in the [[fluid]] flow around a wind turbine actuator. The efficiency of a wind turbine refers to how much of the energy it can get out of the [[wind]] blowing through the rotors.		[[Wind turbine]]s are limited to a maximum theoretical efficiency of 59.3%, which is known as the [[Betz limit]].<ref>WindPower program, ''The Betz limit'' [Online], Available: http://www.wind-power-program.com/betz.htm</ref> This law is derived by a conservation analysis of mass and [[momentum]] in the [[fluid]] flow around a wind turbine actuator. The efficiency of a wind turbine refers to how much of the energy it can get out of the [[wind]] blowing through the rotors.

	==Implications==		==Implications==
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	Efficiency is used to describe the energy that a certain system can extract and make useful from its energy source. Such systems include [[power plant]]s, [[engine]]s, and [[turbine]]s. ''Any'' system that uses energy from a [[fuel]] or [[flow]] has a certain efficiency associated with it.		Efficiency is used to describe the energy that a certain system can extract and make useful from its energy source. Such systems include [[power plant]]s, [[engine]]s, and [[turbine]]s. ''Any'' system that uses energy from a [[fuel]] or [[flow]] has a certain efficiency associated with it.

	The efficiency of [[coal]] and [[natural gas]] power plants range between 32% to 42%.<ref>Bright Hub Engineering, ''The Efficiency of Power Plants of Different types'' [Online], Available: http://www.brighthubengineering.com/power-plants/72369-compare-the-efficiency-of-different-power-plants/</ref> If a [[power plant]] has an efficiency of 35% then, for every 100 [[joule\|J]] of heat from coal, only about 35 J become electricity, the other 65 J become [[heat]]. This heat goes into making the [[atmosphere]] warmer, or perhaps a body of water like a river or lake.		The efficiency of [[coal]] and [[natural gas]] power plants range between 32% to 42%.<ref>Bright Hub Engineering, ''The Efficiency of Power Plants of Different types'' [Online], Available: http://www.brighthubengineering.com/power-plants/72369-compare-the-efficiency-of-different-power-plants/</ref> If a [[power plant]] has an efficiency of 35% then, for every 100 [[joule\|J]] of heat from coal, only about 35 J become electricity, the other 65 J become [[heat]]. This heat goes into making the [[atmosphere]] warmer, or perhaps a body of [[water]] like a river or lake.

	This isn't a failure of engineering, but rather a limit imposed by [[thermodynamics]], with the maximum efficiency of such plants given by the [[Carnot efficiency]]. The lower the efficiency of such plants are, the more detrimental the effects of it are on the [[environment]] as more of these fuels need to be used in order to fulfill energy needs. The ability to increase efficiency is a topic with ongoing research, primarily due to the fact that the ability to increase efficiency will lessen environmental impacts of energy use and reduce resource needs in the future. Along with efficiency, it is important for both the environment and for people's health that the right fuels are [[access to non-solid fuel\|accessible]].		This isn't a failure of engineering, but rather a limit imposed by [[thermodynamics]], with the maximum efficiency of such plants given by the [[Carnot efficiency]]. The lower the efficiency of such plants are, the more detrimental the effects of it are on the [[environment]] as more of these fuels need to be used in order to fulfill energy needs. The ability to increase efficiency is a topic with ongoing research, primarily due to the fact that the ability to increase efficiency will lessen environmental impacts of energy use and reduce [[resource]] needs in the future. Along with efficiency, it is important for both the environment and for people's health that the right fuels are [[access to non-solid fuel\|accessible]].

	[[Cogeneration]] plants can make use of [[waste heat]] in power plants and other heat systems (like a car's engine running a heater) in order to power other parts of the system, thereby making the total efficiency higher.<ref>Forbes, ''The Most Efficient Power Plants'' [Online], Available: http://www.forbes.com/2008/07/03/energy-efficiency-cogeneration-biz-energy_cx_jz_0707efficiency_horror.html</ref>		[[Cogeneration]] plants can make use of [[waste heat]] in power plants and other heat systems (like a car's engine running a [[heater]]) in order to power other parts of the system, thereby making the total efficiency higher.<ref>Forbes, ''The Most Efficient Power Plants'' [Online], Available: http://www.forbes.com/2008/07/03/energy-efficiency-cogeneration-biz-energy_cx_jz_0707efficiency_horror.html</ref>

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]