"Renewable energy" refers to an energy source that is obtained through natural processes and is inexhaustible. There are many types of renewable energy, all of which come directly or indirectly from the sun or heat energy deep underground. (International Energy Agency 2003) The following are some of the more common renewable energy sources: Picture reference: heh/NR/rdonlyres/23B163B6-D205-4902-80C7-F621091EE969/0/renewable_flash_01_tchi Picture reference: heh/NR/rdonlyres/B13BCE15 -03ff-41D9-B5F2-BCB953A437C8/0/Renewable_flash_01_schi Picture Reference: Heh/NR/RDONLYRES/645F42E2-D39A-45C4-330E27D470/0/0/0/0 H_01_schi_mo solar energy converts the radiation energy of the solar into heat or electrical energy. Wind energy converts wind power into mechanical or electrical energy. Tidal energy, wave energy and ocean currents can convert the energy generated by flowing water into mechanical energy or electrical energy. Biomass energy involves burning organic tissue such as trees, agricultural waste and other organic materials to produce heat. In addition, biogas can be produced as fuel by decomposing organic matter in organisms. Geothermal energy uses the natural thermal energy inside the earth to directly generate hot water or steam, or to generate electricity. Water energy Water flows downward from high places to generate energy that drives machines to generate electricity. Types of renewable energy Tidal energy Picture reference: heh/NR/rdonlyres/A923DBBE-D3D8-4388-8C88-E8E6ADF3EF92/0/renewable_flash_03_tchi Picture reference: heh/NR/rdonlyres/082AD3AE-02D5-4FC9-8C4E-872809775A0C/0/renewable_f lash_03_schi Picture reference: heh/NR/rdonlyres/2BCEDE5F-C444-4B67-BE4A-14D85FDA507B/0/renewable_flash_03_schi_mo The gravitational pull exerted by the sun and moon on the rotating earth causes the ocean to ebb and flow. Humans have taken advantage of the ebb and flow of ocean tides to build tidal power plants to produce electricity. When the tide rises, seawater rushes into the reservoir and as it passes through the turbines, it drives a generator to generate electricity. When the tide goes out, the seawater retreats from the dam. When the water is discharged, it flows through the turbine, which also drives the generator to generate electricity. Wave energy picture reference: heh/NR/rdonlyres/D4C0978B-3656-4055-8679-E5F4A4369220/0/renewable_flash_04_tchi Picture reference: heh/NR/rdonlyres/5467FCEE-C92E-4727-B647-8B2A1AEF7048/0/renewable_flash _04_schi Picture reference: heh /NR/rdonlyres/2FFD49FE-C6C6-4960-B2C2-20773C468061/0/renewable_flash_04_schi_mo Waves are mainly caused by wind, and the sea surface generates waves driven by the wind. Waves cause the water level in the caisson to rise and fall, causing air to flow in and out of the top of the caisson. The flowing air drives a turbine, which in turn drives a generator to generate electricity.
Ocean current energy picture reference: heh/NR/rdonlyres/7CB96C97-7287-4031-8F4B-25467D35D8B1/0/renewable_flash_05_tchi Picture reference: heh/NR/rdonlyres/C60A518C-3DA8-4DCE-BFD2-7B99996A8C6A/0/renewable_flash _05_schi Picture reference: heh /NR/rdonlyres/34895AF4-4342-40A5-AFC8-12A33A42B0A7/0/renewable_flash_05_schi_mo Ocean current energy is mainly generated by tides and can be used to generate electricity. Turbines and generators are installed underwater. When seawater flows through the blades on the turbine, the generator can generate electricity by using the power of the water flow. Geothermal energy picture reference: heh/NR/rdonlyres/2519F3A0-2B4C-4D0D-974B-B3075848B4F5/0/renewable_flash_06_tchi Picture reference: heh/NR/rdonlyres/1AFAF6C6-ABB6-4F08-A856-63AD129FAEF9/0/renewable_flash_0 6_schi picture reference: heh /NR/rdonlyres/ABEC524E-2AE3-480B-9978-2F01510627C0/0/renewable_flash_06_schi_mo The thermal energy contained in the earth's crust is called geothermal energy. The temperature of the lava inside the earth is extremely high, which can heat the nearby groundwater and seep out the heat from the ground. Water and steam can be accessed directly. Scientists believe that the amount of geothermal energy stored in the earth's core is equivalent to tens of thousands of times the current global oil and natural gas reserves. Biomass energy picture reference: heh/NR/rdonlyres/2FB45707-0042-4021-A0CD-6BE4FB5BECFE/0/renewable_flash_07_tchi Picture reference: heh/NR/rdonlyres/E4C20674-AECC-4762-B797-706186861430/0/renewable_flash_07_ schi picture reference: heh/NR/rdonlyres/7EBBDABD-D358-439F-AC5E-088C7DA25BB4/0/renewable_flash_07_schi_mo Biomass energy uses organic matter such as plants, trees or waste as fuel to produce electricity and heat. Burning trees to generate heat is a prime example. In addition, organic waste discarded in landfills decomposes over a period of time to produce methane (or biogas), which can be used as fuel for power generation. Water energy picture reference: heh/NR/rdonlyres/D1A20EC1-07C0-4115-93E2-D4DBC664FB85/0/renewable_flash_08_tchi Picture reference: heh/NR/rdonlyres/D9F8E942-85E7-48F5-A87D-20E8ED3B3B84/0/renewable_flash_ 08_schi Picture reference: heh /NR/rdonlyres/B3D72834-FB97-4438-9C75-827C03B145E4/0/renewable_flash_08_schi_mo The principle of hydropower is to use the difference in water levels to convert the potential energy contained in the water at higher locations into electrical energy. A dike is built on high ground to separate the river water, and then the water stored in the reservoir in the dike is allowed to flow downward from the high ground. The flowing water passes through the turbine and drives the generator to generate electricity.
Because large hydropower facilities often impact river ecology and nearby residents, some researchers consider smaller hydropower facilities to be considered renewable energy projects. fuel. NOTE: See other display panels for detailed information on solar and wind energy. The history of renewable energy schi_mo Thousands of years ago, humans began to adopt renewable energy. In ancient times, people knew how to drill wood to make fire for lighting and keeping warm. The sun's radiation can dry clothes and crops. Farmers use wind power to power machines to grind grain and irrigate crops. Industrial Revolution Picture Reference: heh/NR/rdonlyres/65229621-7779-4390-9F83-3F09DAD0C96D/0/renewable_02_schi Picture Reference: heh/NR/rdonlyres/8D218E14-A5D2-4CE1-B4DA-AF6C83900B97/0/renewable_02_schi_ mo nineteenth century , some countries are starting to use renewable energy to generate electricity. In 1891, the first practical solar water heater was patented in the United States. Waterwheel in Kirkby, England. Small wind power is becoming popular in the United States. Modern picture reference: heh/NR/rdonlyres/6CB4585E-6FB4-4A56-AD89-17DC2D2227D2/0/renewable_03_schi Picture reference: heh/NR/rdonlyres/A18694B2-545B-4F3B-B3DF-4CAF1C6B7919/0/renewable_03_schi_mo Now, renewable energy The application of solar energy is becoming more and more common, and we can find large-scale wind farms, hydroelectric power stations and other projects using solar energy all over the world. The Ponnequin Wind Farm in Colorado, USA. The Cascade house in Amersfoort, the Netherlands, has a capacity of 1 MW. Taxis fueled by 100% biodiesel (i.e. recycled rapeseed oil) are located on the islands of Maui and Oahu in Honolulu, Hawaii, USA. Examples of the application of renewable energy around the world Based on environmental concerns and the realization that the earth's existing fossil fuels are being rapidly depleted, scientists have been working hard to find other energy sources that can replace fossil fuels. Therefore, developed countries have invested a lot of resources in developing renewable energy and related technologies. A variety of renewable energy sources have been widely used. In addition, ocean current energy and wave energy are also in the initial development stage. For example: Image reference: heh/NR/rdonlyres/E595C115-3AF9-444A-9BEF-F83F18032C79/0/renewable_flash_02_tchi Image reference: heh/NR/rdonlyres/1D57F42A-3D59-4C4D-A78E-00F8DB083C91/0/renewable_flash _02_schi Picture reference: heh /NR/rdonlyres/03353A75-8717-4AD2-B032-67E8651A5798/0/renewable_flash_02_schi_mo The tidal power plant in La Rance, France, was put into operation in 1966. The ocean current power generation equipment located in Norway was put into operation in 2003. It is of experimental nature and can be connected to the power grid with an installed capacity of 300 kilowatts.
Located on Islay, a small island in Scotland, the UK, the LIMPET wave energy power generation equipment on the island is experimental and has an installed capacity of 500 kilowatts. The Geysers geothermal energy power plant in northern California, USA, was put into operation in 1960 with an initial installed capacity of 11,000 kilowatts. The Drop Hydro power plant located in central New South Wales, Australia, was put into operation in 2002 with an installed capacity of 2000 kilowatts. The biomass (tree-based) power plant located in Ballington, Vermont, USA, was put into operation in 1984 with an installed capacity of 50,000 kilowatts. Examples of application of renewable energy in Hong Kong Solar energy has been applied in Hong Kong for more than 20 years, but the scale is small and the scope of application is mainly for the supply of hot water. Solar water heater picture reference: heh/NR/rdonlyres/06F7F080-28C4-4C2E-8CE4-2A79C1E8A6BA/0/renewable_04 Picture reference: heh/NR/rdonlyres/0795C14B-4B2B-44DE-8353-EAF892F67DED/0/renewable_04_mo Current installation location Much Found in low-density housing in the New Territories, the largest solar hot water system was installed in the Sheung Shui Slaughterhouse. Reference of solar photovoltaic board system: HEH/NR/RDONLYRES/321EA6A4-6096-4BE8-9929-15E9CE514575/0/Renewable_06 Reference: HEH/NR/RDONLYRES/0401E04E-5892-928A-CE03E8E8 Cf067b/0/renewable_06_mo some* ** and private projects have installed solar photovoltaic panel systems that can be connected to the grid, including the *** Building in Wan Chai, the Electrical and Mechanical Services Department headquarters in Kai Tak and the Science Park in Shatin. Wind energy picture reference: heh/NR/rdonlyres/7F79A386-56C2-49D0-9F89-764C53D4E564/0/renewable_05 Picture reference: heh/NR/rdonlyres/73F9EB21-16C2-4549-B30A-74816F24E606/0/renewable_05_mo 2 Early 2006, Hong Kong, China The first commercial-scale wind turbine in Hong Kong built by Electric Co., Ltd. was put into operation, opening a new page in the history of Hong Kong's power development. The generator has a capacity of eight hundred kilowatts. Advantages of Renewable Energy Image Reference: heh/NR/rdonlyres/B25F8B19-113F-45E5-8E96-E3DFF3CAD34C/0/renewable_07 Image Reference: heh/NR/rdonlyres/4D66F35A-3064-48EE-966C-A0B01185476B/0/renewable_07_mo Protection The environment is clean and no harmful substances are emitted. It is inexhaustible and can be replenished continuously. Not only will it not be exhausted one day like fossil fuels, it will not consume any other resources on the earth. No fuel is required. It is obtained from nature and can be used directly to generate energy or electricity. Challenges faced by renewable energy Image reference: heh/NR/rdonlyres/5312F450-0D9B-4B7E-9B1A-4B2A0B1821E4/0/renewable_08 Image reference: heh/NR/rdonlyres/5B26464F-1672-4A0E-BBE0-53692D13AB1C/0/ renewable_08_mo It is difficult to predict, and the supply of wind energy is unstable and requires sufficient wind power, while solar energy can only be used effectively when the sky is clear and the sun is shining.
Some projects require large areas of land. For example, a wind farm that can produce 400 million kilowatt-hours of electricity (about one percent of the annual electricity consumption in Hong Kong, China) requires about 4,000 hectares of land. Construction costs are higher than traditional power generation projects. Renewable energy is not as cost-effective as traditional energy projects because of its higher investment but low utilization rate.
Renewable energy generally refers to a variety of inexhaustible energy sources. Strictly speaking, it is an energy source that will not be exhausted in human lifetimes. Renewable energy does not include currently limited energy sources such as fossil fuels and nuclear energy. Most renewable energy is actually storage of solar energy. Renewable does not mean providing energy for ten years, but for hundreds or even thousands of years. With the emergence of the energy crisis, people began to discover the importance of renewable energy. Solar energy Geothermal energy Water energy Wind energy Biomass energy History The basic energy source for all human activities comes from the sun and is absorbed through the photosynthesis of plants. ca va bioenergy bonjour wood Firewood is the earliest energy used, and it becomes an energy source for heating through combustion. Burning wood was important for cooking and providing heat, allowing people to survive in cold environments. Animal pulling: In addition to transporting goods, traditional farm animals such as cows, horses and mules can also grind and push some machinery to generate energy. Water energy Mills are a good example of using water energy. Hydropower is an important energy source in modern times, especially in countries full of rivers such as China and Canada. In addition, the coastlines of some coastal countries are also very suitable for tidal power generation. Wind Energy Humans have used wind power for hundreds of years. Like a sailboat.
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Renewable energy is energy obtained from nature and is essentially inexhaustible. Renewable energy is also called clean energy or green energy because it does not pollute the environment. Examples of renewable energy sources are solar energy, wind energy, hydro energy, biomass energy and geothermal energy. 1) Solar energy is powerful energy coming directly from the sun. Solar panels are made of semiconductors that absorb sunlight and then convert it into electricity for our daily use. Solar panels precisely use the principle of the photoelectric effect to produce electricity. When sunlight shines on the surface of a metal, some photons will hit the metal atoms. Part of the energy of the photons is converted into the potential energy of the outer electrons of the atoms, causing the electrons to be freed from the atoms. The other part of the energy is converted into This is the kinetic energy of the electron flying out of the atom. The liberated electrons have a negative electric field and form a negative voltage within the conductor, so they will flow to areas with relatively high potential (that is, low negative values). If they can be properly controlled, they can be made for human use. of electrical energy. 2) Wind energy Strictly speaking, wind energy comes from solar energy. Simply put, the cause of wind is that the sun shines on the ground and heats it, and the air above it heats up and creates convection. This convection is the flow of air, or "wind." As a result of the relative motion between the earth and the sun, places on the earth with different latitudes and terrains (heights) experience seasonal and day-night temperature changes. The flow of airflow is also affected by the temperature, air pressure, and terrain of each place. Therefore, the temperature of each place changes. The wind direction and speed are changing all the time. The principle of wind power generation, simply put, is to use wind power to drive the windmill blades to rotate, and then use a speed increaser to increase the speed of rotation to prompt the generator to generate electricity. 3) Hydropower uses water to generate electricity. It uses artificial methods to cut off the river by using dams. The flowing water is blocked by the dams and is therefore accumulated behind the dams. The accumulated water level will continue to rise due to the non-increasing flow of water until the dams height limit. When the water level rises, the water stores the energy of the flow and exists in the form of potential energy. Whenever the dam's valve is opened, water falls from a height and hits the turbine at high speed, causing the turbine and generator to rotate, thus generating electricity. Therefore, barrages and reservoirs are generally built upstream of hydropower stations to store water and increase the head (water head). 4) Biomass energy: Burning organic matter such as firewood, crop residues or livestock manure can directly obtain heat energy; in addition, the biogas produced by fermenting these organic matter is also a kind of energy, which is called bioenergy. In addition to animal excrement and plants, we can also collect methane from landfills and use it as fuel for power generation. The biogas power generation devices currently used in Hong Kong's landfills can provide electricity for the entire landfill. In fact, there are many renewable energy sources in the world
But the more common ones include solar energy
wind energy
tidal energy and wave energy
geothermal energy, etc. Both renewable energy. If you want to know detailed information
You can go to the following website
Reference: kws.edu/energy/renewable
Renewable energy refers to a variety of Inexhaustible energy, strictly speaking, is energy that will not be exhausted in human lifetime. Renewable energy does not include currently limited energy sources such as fossil fuels and nuclear energy. Most renewable energy is actually storage of solar energy. Renewable does not mean providing energy for ten years, but for hundreds or even thousands of years. With the emergence of the energy crisis, people began to discover the importance of renewable energy. Solar energy, geothermal energy, hydro energy, wind energy, biomass energy