Fossil fuel reserves have become seriously depleted but conversely our energy use is increasing year on year, our fossil fuel use is now far from being sustainable. Fossil fuels are also responsible for global warming because of the carbon dioxide that is produced with the use of coal power stations and other fossil fuel power stations. In order to stop a further decline in the environment and to replace non-renewable energy many different alternative power sources are being researched and implemented. One such renewable energy source is hydro energy and involves using water to turn turbines, which in turn generates electricity creating hydro energy. The theory is very similar to that of wind energy but instead of the wind turning the sails we use flowing water.
A brief history of hydropower.
The first ever water power station was in Godalming, England in 1881 introducing hydropower as a source of electricity. Previously water turbines had only been used for pumping and irrigation but that has changed significantly now. While some countries have yet to hydro power stations that are efficient and make any significant difference to their energy usage, New Zealand among other countries produce over 70% of its energy from hydro power stations.
Dams.
Dams are built in order to create a man made waterfall; as the water falls it rotates a turbine thus converting the kinetic energy into a usable mechanical energy. This is then turned into electrical energy through the use of a generator. The amount of electricity is determined by how far the water falls and the average water flow; some dams provide enough power for up to 10,000 people so it really is an effective form of creating energy for our homes.
It's highly unlikely that you have a good enough source of running water running through your land that you could feasibly build a dam and add a generator and a turbine but even a small dam in a reasonable river can provide a good amount of energy for local residents. A dam with a 10 foot drop and average water flow of 500 cubic feet per second produces enough power to give approximately 3,000,000kwh per annum; almost enough power for 1000 residents.
The downfall of dams.
Like many sources of green energy, hydro energy has its downfalls; although there is only really one downfall for hydro energy. The major obstacle to building dams and creating hydropower is people. Local residents don't want dams erected in the middle of their local beauty spot so unless the opinions of these people can be turned hydropower won't be as popular as wind energy or solar energy.
Water is a renewable energy resource, and one that offers the greatest variation in power production. We can harness the water energy through what is known as motive energy or through the differences it experiences in temperature. Water is nearly one thousand times as dense as our air. What this tells us, then, is that a slow moving stream of water is more powerful, in terms of renewable energy than wind. A wave or swell of the sea can deliver many times that energy.
We have many forms of renewable water energy from which to choose. There are many forms of water energy.
The first type of water energy, and the one we most commonly think of when we think of renewable water power, is hydroelectric. This is the power that commonly is created by large hydroelectric dams.
You can also have what are called micro hydroelectric systems. These are small power installations that produce as much as 100 kilowatts of power. The most common places to find these renewable water energy sources are in areas where water is abundant and the hydro system can be used as a remote area power supply RAPS. While there are many RAPS around the globe several are functioning in the Solomon Islands.
Wave power is another way of using water as a renewable energy source. The waves are used to create an up and down affect for pontoons that float in the water. This has just started to be used commercially as renewable energy.
Tides can produce renewable energy as well. As the ocean tides come in the water level is raised in the water basin. Then, at low tide the basin water gets discharged through the water turbine. Tidal stream power is different in that it captures the energy produced by the tidal flow. This usually is accomplished through the use of an underwater plant that looks like a small-scale wind turbine. While governments have set up demonstrations for this type of tidal power, any large scale commercialization of this renewable tidal energy would require extensive upfront capital. This has yet to be attempted.
Ocean thermal energy conversion OTEC is yet another form of water energy. OTEC uses the different in temperature between the oceans surface water and the water at deeper points. To do this it uses a cyclic heat engine. This form of renewable energy has had no large scale field test as yet.
Though not technically a form of generating renewable energy the cooling of the water in deep lakes is an efficient way to save energy during the hot summer months. Pipes are submerged and used as heat sinks. The bottom of these lakes typically stays at less than 40 degrees Fahrenheit.
Blue energy, which is really desalination in reverse, is a renewable energy resource still being researched. There is no data at this point to show whether it will work.
Both Peter Lenkefi & James Copper are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.
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