advantages and disadvantages of hydrogen energy

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Question:I'm doing a science homework and the teacher ask what are the advantages and disadvantages of nuclear energy. I need a lot of details and examples. Please help me!!!!

Answers:PROS !. Fission is the most energy for the least fuel with current technology. 2. Less fuel means less waste, and the waste is all accounted for, not released into the atmosphere to become someone else's problem. 3. Uranium is readily available, very common in the earth's crust (about the same as tin) 4. Economical - operating cost about the same as coal, fuel cost is a much smaller percentage of the total, therefore less susceptible to price fluctuations. 5. Reliable - Nuclear power plants have very high capacity factors. 6. No combustion, no Co, CO2 or SO2 released. 7. Creates jobs. 8. Reduce dependence on foreign oil/ fuel. Uranium available domestically and in oceans. 9. High temperature reactors could produce Hydrogen as well as electricity. 10. Fantastic safety record. CONS 1. Irrational fear of all things nuclear. 2. High cost to build and license, large initial investment for long term pay back. 3. Publicly accepted high level storage facility not domestically available. 4. Reprocessing facility not domestically available. 4. High cost of personnel. 5. Security concerns, Nuclear power, I believe is the best, safest, most reliable, current technology to provide energy. The plants operating now are safe and the new designs are even safer. Building 100's of new nuclear power plants would improve the economy, reduce or eliminate dependence on foreign oil, create jobs, reduce pollution, and provide for future technological advancement. I have been working with nuclear power for about 30 years, I would be glad to have a Nuclear power plant or high level waste disposal facility in my backyard. My family and I live in a home within 10 miles of a nuclear power plant. (where I work) I have a great understanding of the risks involved and am completely comfortable with a plant "in my backyard". Using Chernobyl as a reason not to build is like saying because of the Hindenburg I will never fly in a commercial airliner. Nuclear power has the smallest environmental impact of any current energy production method per unit of energy produced. One fuel pellet about the size of a pencil eraser produces the same energy as about 1 ton of coal, and if reprocessed 2/3 of what's left can be reclaimed. Nuclear power is our best option for reliable, environmentally friendly, base-load electrical power.


Answers:I guess i'll have to expand on the above list to make people face the truth. First of all, the Polysilicates usually make solar cells expensive, true. And in the manufacturing process of these panels to make one actually big enough to use, you do cause some polution. According to statistics, there is hardly any solar system that actually pays for itself. You will have to also maintain them to ensure that they panels do not build up a film due to rain, dust, debris. Some area's have unique problems like hurricanes in the Southeast, snowloads in the north and earthquakes in the west. a Solar system is basically a small electrical plant, in which you are using energy from the sun to charge up batteries, thus needing a charging system, a distribution system and the batteries themselves give off explosive gas if in a confined area while charging. 2% to 4% of the hydrogen atmosphere can be dangerous if using unsealed types. You will also usually require rewiring some of your house if you want to go low voltage. If not, then you need a DC to AC converter and enough battery capactiy to provide your electrical needs for such a conversion since transmission, conversion and regulation result in some loss. Then there's the hazmat issue in regards to the batteries when they need replacing. The Advantages....if all runs well witout breakdowns, you can live off the grid, or supplement your use from the grid therefore making a lower electrical bill. You will have bragging rights....despite the system will probably never pay for itself. You might qualify for a discount or some kind of rebate...if the city you rin hasn't already quit the program or gone bankrupt because of it. You will have lights on when your neighborhood loses power due to a line being down.


Answers:Advantages 1.The 122 petawatts of sunlight reaching the earth's surface is plentiful compared to the 13 terawatts of average power consumed by humans.Additionally, solar electric generation has the highest power density (global mean of 170 W/m2) among renewable energies. 2.Solar power is pollution free during use. Production end wastes and emissions are manageable using existing pollution controls. End-of-use recycling technologies are under development. Facilities can operate with little maintenance or intervention after initial setup. 3.Solar electric generation is economically competitive where grid connection or fuel transport is difficult, costly or impossible. Examples include satellites, island communities, remote locations and ocean vessels. 4.When grid connected, solar electric generation can displace the highest cost electricity during times of peak demand (in most climatic regions), can reduce grid loading, and can eliminate the need for local battery power for use in times of darkness and high local demand; such application is encouraged by net metering. Time-of-use net metering can be highly favorable to small photovoltaic systems. 5.Grid connected solar electricity can be used locally thus minimizing transmission/distribution losses (approximately 7.2%). 6.Once the initial capital cost of building a solar power plant has been spent, operating costs are low when compared to existing power technologies.). Disadvantages 1.Polysilicon Solar cells are costly, requiring a large initial capital investment, and silicon shortages raise prices. Costs are expected to come down, however, due to increased manufacturing, economies of scale and Balance of System planning. Thin film technology uses less silicon; and Lease/Rental options* are currently being introduced. 2.Limited power density: Average daily insolation in the contiguous U.S. is 3-9 kWh/m2 usable by 7-17.7% efficient solar panels. 3.To get enough energy for larger applications, a large number of photovoltaic cells is needed. This increases the cost of the technology and requires a large plot of land. 4.Like electricity from nuclear or fossil fuel plants, it can only realistically be used to power transport vehicles by converting light energy into another form of stored energy (e.g. battery stored electricity or by electrolysing water to produce hydrogen) suitable for transport. 5.Solar cells produce DC which must be converted to AC when used in currently existing distribution grids. This incurs an energy loss of 4-12%.

Question:Also, give some advantages and disadvantages of coal as fuel and the advantages and disadvantages of natural gas?

Answers:Hydrogen has to be made, in some way, and it takes a lot of energy to do so. Beyond that, it is a good fuel. All the things you hear about it exploding are pure fantasy. Coal, is cheap, plentiful at the moment, and burns at a very high temperature. That is, if it is Anthracite, which is very hard, almost pure carbon. This coal is just one step away from becoming diamond. Yes, diamonds can burn as they are pure carbon. It's down side, radioactive elements in it, the smoke is bad in any respect, the ash from it is hard to get rid of, and the smell is something to not be around. Natural gas is about the best fuel going. It is abundant, has no odor, burns hot and clean, although it does produce carbon dioxide which is a green house gas, and can be easily made, Remember that nice snack that you had, or are eating now, bacteria gets to feed on it too, partly so that you can get benefit from it, and that bacteria is going to produce, among other things, natural gas. What we poot out, is a mixture of gasses, of which natural gas is one of them.

From Youtube

Solar Energy Advantages and Disadvantages A quick run-down on the advantages and disadvantages of solar panels as a source of electricity.

Solar Energy Advantages Disadvantages Solar Energy is being used in homes around the globe to provide heating and lighting as well as a few other uses. It's something that is only going to grow as a market, as the current energy sources become rare, and prices continue to increase. created at