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Solar Power

A prez-entation outlining the need for solar energy investment in both mind and money.
by

alex alexander

on 4 September 2012

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Transcript of Solar Power

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli So much light hits the earth that one single hour of sunshine is more than enough to meet the needs of every person, city and country in the world for a year. "Sunlight, like salvation, is free..." We have several means by which to convert this energy into a more useful form. Solar Water Heating Solar Power Towers Solar Photovoltaic Parabolic Troughs Parabolic Dishes uses a solar collector on top to gather radiation
for low temperature heating (60 degrees Celsius). Its perfect for domestic hot water heating, which accounts for up to 20% of a houshold's energy usage. and even warming up swiming pools (which is an otherwise costly affair)! not to mention, industrial purposes. Though industries tend to require far higher temperatures than 60 degrees, some use it as "pre-heating" which takes some of the load off fossil fuels. It is the cheapest means of using the energy as it can only heat up water. This refers to the direct conversion of light energy into electrical energy via solar or pv cells. Since PV cells are made from silicon, it should be noted that silicon is the second most abundant material on earth after oxygen in the earth’s crust. For commercial and industrial buildings PV roof and wall cladding is ideal. Since they are only occupied during daylight hours anyway, this correlates with availability of light and reduce their needs to purchase conventional electricity. Reserve energy can be stored for later use. Currently, PV and solar cells are 20-30% efficient. This cladding is ideal for growing economies in countries like Mexico, Brazil, India and China. An advantages is that a PV system can be constructed to any size based on energy requirements. Furthermore, the owner of a PV system can enlarge or move it if his or her energy needs change. As the conversion efficiencies continue to increase and the manufacturing costs continue to come down, PV will become increasingly competitive with conventional fuels. However, solar energy is somewhat more expensive to produce than conventional sources of energy due in part to the cost of manufacturing PV devices and in part to the conversion efficiencies of the equipment. Parabolic mirrors, whether they be in a trough or dish shapped formation, both work exactly alike. is a type of mirror that brings light to a precise focus in the centre. It is therefore essential that parabolic mirror follows the sun. Parabolic Parabolic Dish Parabolic Parabolic Parabolic Parabolic A Parabolic Mirror Parabolic Well what is "parabolic"? Parabolic Trough The difference between them is their efficiency. Troughs are far less efficent, at only 14% conversion. Dishes are rather efficient at about 30% conversion. The concentrated light heats up water, which then drives a turbine, creating electricity. Mirrors being less expensive than PV cells is an advantage. Though, the system isn't fully efficient. use heliostats (mirrors) to focus light on one point (tower) and heat water moving a turbine to generate electricity. As with the parabolic dish method, solar power towers are not as expensive as solar cells, though they require plenty of space. Its efficiency doesn't exceed that of other means by much. It is still standing at about 20-40%. Having briefly covered the many means of harnessing light, lets move on to how various groups have Mirros reflect light to a single area. Physics Presentation: Solar Power We have several means by which to convert this energy into a more useful form. Solar Water Heating Solar Power Towers Solar Photovoltaic Parabolic Troughs Parabolic Dishes uses a solar collector on top to gather radiation
for low temperature heating (60 degrees Celsius). Its perfect for domestic hot water heating, which accounts for up to 20% of a houshold's energy usage. and even warming up swiming pools (which is an otherwise costly affair)! not to mention, industrial purposes. Though industries tend to require far higher temperatures than 60 degrees, some use it as "pre-heating" which takes some of the load off fossil fuels. It is the cheapest means of using the energy as it can only heat up water. This refers to the direct conversion of light energy into electrical energy via solar or pv cells. Since PV cells are made from silicon, it should be noted that silicon is the second most abundant material on earth after oxygen in the earth’s crust. For commercial and industrial buildings PV roof and wall cladding is ideal. Since they are only occupied during daylight hours anyway, this correlates with availability of light and reduce their needs to purchase conventional electricity. Reserve energy can be stored for later use. Currently, PV and solar cells are 20-30% efficient. This cladding is ideal for growing economies in countries like Mexico, Brazil, India and China. An advantages is that a PV system can be constructed to any size based on energy requirements. Furthermore, the owner of a PV system can enlarge or move it if his or her energy needs change. As the conversion efficiencies continue to increase and the manufacturing costs continue to come down, PV will become increasingly competitive with conventional fuels. However, solar energy is somewhat more expensive to produce than conventional sources of energy due in part to the cost of manufacturing PV devices and in part to the conversion efficiencies of the equipment. Parabolic mirrors, whether they be in a trough or dish shapped formation, both work exactly alike. is a type of mirror that brings light to a precise focus in the centre. It is therefore essential that parabolic mirror follows the sun. Parabolic Parabolic Dish Parabolic Parabolic Parabolic Parabolic A Parabolic Mirror Parabolic Well what is "parabolic"? Parabolic Trough The difference between them is their efficiency. Troughs are far less efficent, at only 14% conversion. Dishes are rather efficient at about 30% conversion. The concentrated light heats up water, which then drives a turbine, creating electricity. Mirrors being less expensive than PV cells is an advantage. Though, the system isn't fully efficient. use heliostats (mirrors) to focus light on one point (tower) and heat water moving a turbine to generate electricity. As with the parabolic dish method, solar power towers are not as expensive as solar cells, though they require plenty of space. Its efficiency doesn't exceed that of other means by much. It is still standing at about 20-40%. Mirros reflect light to a single area. We have several means by which to convert this energy into a more useful form. Solar Water Heating Solar Power Towers Solar Photovoltaic Parabolic Troughs Parabolic Dishes uses a solar collector on top to gather radiation
for low temperature heating (60 degrees Celsius). Its perfect for domestic hot water heating, which accounts for up to 20% of a houshold's energy usage. and even warming up swiming pools (which is an otherwise costly affair)! not to mention, industrial purposes. Though industries tend to require far higher temperatures than 60 degrees, some use it as "pre-heating" which takes some of the load off fossil fuels. It is the cheapest means of using the energy as it can only heat up water. This refers to the direct conversion of light energy into electrical energy via solar or pv cells. Since PV cells are made from silicon, it should be noted that silicon is the second most abundant material on earth after oxygen in the earth’s crust. For commercial and industrial buildings PV roof and wall cladding is ideal. Since they are only occupied during daylight hours anyway, this correlates with availability of light and reduce their needs to purchase conventional electricity. Reserve energy can be stored for later use. Currently, PV and solar cells are 20-30% efficient. This cladding is ideal for growing economies in countries like Mexico, Brazil, India and China. An advantages is that a PV system can be constructed to any size based on energy requirements. Furthermore, the owner of a PV system can enlarge or move it if his or her energy needs change. As the conversion efficiencies continue to increase and the manufacturing costs continue to come down, PV will become increasingly competitive with conventional fuels. However, solar energy is somewhat more expensive to produce than conventional sources of energy due in part to the cost of manufacturing PV devices and in part to the conversion efficiencies of the equipment. Parabolic mirrors, whether they be in a trough or dish shapped formation, both work exactly alike. is a type of mirror that brings light to a precise focus in the centre. It is therefore essential that parabolic mirror follows the sun. Parabolic Parabolic Dish Parabolic Parabolic Parabolic Parabolic A Parabolic Mirror Parabolic Well what is "parabolic"? Parabolic Trough The difference between them is their efficiency. Troughs are far less efficent, at only 14% conversion. Dishes are rather efficient at about 30% conversion. The concentrated light heats up water, which then drives a turbine, creating electricity. Mirrors being less expensive than PV cells is an advantage. Though, the system isn't fully efficient. use heliostats (mirrors) to focus light on one point (tower) and heat water moving a turbine to generate electricity. As with the parabolic dish method, solar power towers are not as expensive as solar cells, though they require plenty of space. Its efficiency doesn't exceed that of other means by much. It is still standing at about 20-40%. Mirros reflect light to a single area.
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