Hydraulic turbines have two main classifications: impulse and reaction. The impulse turbine generally uses the velocity of the water to move the runner and discharges to atmospheric pressure. The water stream hits each bucket on the runner. There is no suction on the down side of the turbine, and the water flows out the bottom of the turbine housing after hitting the runner. An impulse turbine is generally suitable for high-head, low-flow applications. (more…)
Up to around 1980, hydropower research and development (R&D) efforts focused mainly on improving turbine efficiency, reducing c ...
Wind energy alongside solar energy is one form of renewable energy and its supply is abundant in earth. Most people distinguish ...
Renewable energy generators are devices that convert energy from its original form in the renewable energy source into electric ...
The total installed geothermal power generating capacity in the world is approximately 9000 MWe from 21 countries, with the United ...
In today's day and age there are millions of people who generate their own green energy at home by learning how to build windmills ...
Hydropower, also known as hydroelectric power, is the use of water to produce power. Harnessing water to perform work has been going on for thousands of years. The Greeks used waterwheels for grinding wheat into flour more than 2000 years ago. Besides grinding flour, the power of the water was used to saw wood and to power textile mills and manufacturing plants. This article looks briefly at how hydropower plant began, why it is considered renewable energy technology, the parts of a hydropower plant, types of turbines and when they are used, and what research and development is occurring. (more…)
Up to around 1980, hydropower research and development (R&D) efforts focused mainly on improving turbine efficiency, reducing c ...
The water levels of most of the world’s rivers fluctuate with seasonal rains, melting snows, or droughts, and in the arid zones ...
The World Commission on Dams (WCD) was formed in 1998 by a joint initiative of the World Conservation Union (IUCN) and the Worl ...
The winners in hydropower and other large dam projects are those who gain electricity, domestic water supplies, sanitation, dro ...
The demand for electric energy by a community varies with the time of day and with the time of year. An electric power utility ...
The World Commission on Dams (WCD) was formed in 1998 by a joint initiative of the World Conservation Union (IUCN) and the World Bank (WB) after a historic meeting of leading dam proponents and opponents in Switzerland, with proceedings reported by Dorcey and others. The WCD was asked to discover the truth about the hydropower energy facts, hydropower energy pros and cons, cost, effect, and benefit of large dams and it functioned independently for 2 years at a cost of $10 million. The money was well spent, and at the end of that period the WCD produced a comprehensive report and numerous support documents, and then dissolved itself. The report and support documents remain on the Internet available to all, and they have changed forever the debate about dams. (more…)
The water levels of most of the world’s rivers fluctuate with seasonal rains, melting snows, or droughts, and in the arid zones ...
Hydropower, also known as hydroelectric power, is the use of water to produce power. Harnessing water to perform work has been ...
The winners in hydropower and other large dam projects are those who gain electricity, domestic water supplies, sanitation, dro ...
Up to around 1980, hydropower research and development (R&D) efforts focused mainly on improving turbine efficiency, reducing c ...
Some of alternative fuel sources are by no means new. For centuries people have harnessed the power of running water for a vari ...
Electromagnetic Suspension (EMS) system in which an array of magnets is attracted upwards to a steel rail. It is possible to design the magnets so that there is an upward force produced by magnetic attraction that cancels the downward gravitational force: the magnets are suspended in space! If steel beams were mounted on either side of a “guideway,” then a vehicle with magnets on both sides could move along the guideway and be supported and guided by the steel rails. (more…)
Electrodynamic Suspension (EDS) can be viewed as an array of magnets moving over a conducting sheet and being pushed upwards by ...
All electromagnetic suspension-based systems employ some type of feedback control mechanism to maintain stable levitation. (An inte ...
In contrast to electromagnetic suspension systems, electrodynamic suspension systems can provide stable suspension without a feedba ...
A propulsion alternative is to transfer power to the vehicle and then have a magnetic structure on the vehicle that can create ...
Wind energy alongside solar energy is one form of renewable energy and its supply is abundant in earth. Most people distinguish ...
Renewable energy generators are devices that convert energy from its original form in the renewable energy source into electricity. Renewable energy generators that are most likely to be found in hybrid energy systems include wind turbines and photovoltaic panels. Some hybrid energy systems use hydroelectric generators, biomass fueled generators, or fuel cells. It should be noted that many renewable energy generators include rotating electrical machines acting in the generating mode, which is also called a generator. It should be clear from the context what is meant. (more…)
In many countries of the world wind power expands and covers a steadily increasing part of these countries’ power demand. Growi ...
Wind energy alongside solar energy is one form of renewable energy and its supply is abundant in earth. Most people distinguish ...
In 2001, there were 14,000 small wind turbines for home/domestic use in the United States. The market potential for national an ...
Would it not be great to be able to produce your own electricity supply at home? The idea of being independently powered up without ...
Wind is a natural and inexhaustible source of energy, wind does not have to be imported or mined from deep down the earth. Wind ...
The characteristics and components of a hybrid system depend greatly on the application. The most important consideration is whether the system is isolated or connected to a central utility grid.
Central Grid Connected Hybrid Systems
If the hybrid system is connected to a central utility grid, as in a DG application, then the design is simplified to a certain degree and the number of components may be reduced. This is because the voltage and frequency are set by the utility system and need not be controlled by the hybrid system. (more…)
The term hybrid energy system refers to those applications in which multiple energy unit conversion devices are used together t ...
There are numerous possible applications for hybrid power systems. The most common examples are (1) remote AC network, (2) dist ...
Renewable energy generators are devices that convert energy from its original form in the renewable energy source into electric ...
In many countries of the world wind power expands and covers a steadily increasing part of these countries’ power demand. Growi ...
Don't pay for your energy anymore use solar panels and a residential wid generator and have the electric company paying you. You pl ...
There are numerous possible applications for hybrid power systems. The most common examples are (1) remote AC network, (2) distributed generation applications in a conventional utility network, and (3) isolated or special purpose electrical loads.
The classic example of the hybrid energy systems is the remote, diesel-powered AC network. The basic goal is to decrease the amount of fuel consumed by diesel generators and to decrease the number of hours that they operate. The first addition to ‘‘hybridize’’ the system is to add another type of generator, normally using a renewable source. (more…)
The term hybrid energy system refers to those applications in which multiple energy unit conversion devices are used together t ...
The characteristics and components of a hybrid system depend greatly on the application. The most important consideration is wh ...
Renewable energy generators are devices that convert energy from its original form in the renewable energy source into electric ...
The primary electric drivetrain components for fuel cell vehicles are the same as those for any electric vehicle: traction motors, ...
The term hybrid energy system refers to those applications in which multiple energy unit conversion devices are used together to supply an energy requirement. These systems are often used in isolated applications and normally include at least one renewable energy source in the configuration. Hybrid energy systems are used an alternative to more conventional systems, which typically are based on a single fossil fuel source. Hybrid energy systems may also be used as part of distributed generation application in conventional electricity grid. (more…)
There are numerous possible applications for hybrid power systems. The most common examples are (1) remote AC network, (2) dist ...
The characteristics and components of a hybrid system depend greatly on the application. The most important consideration is wh ...
Renewable energy generators are devices that convert energy from its original form in the renewable energy source into electric ...
The primary electric drivetrain components for fuel cell vehicles are the same as those for any electric vehicle: traction motors, ...
The idea of using an absorption fluid as a refrigerant carrier derived from the drawback of VCR (vapor–compression refrigeration) systems that the gas compression requires a high work input. A pump that requires practically no work to increase the pressure in the refrigeration system replaces the complicated and work-consuming compressor. There are two major advantages of absorption refrigeration systems (ARSs) compared with VCRs (vapor–compression refrigeration): No CFCs or HCFCs are used as refrigerants, and they use heat from different sources, such as combustion, industrial processes, waste heat (an economical solution for recovery), or solar heat. (more…)
Heat-actuated heat pumps are cooling systems requiring no electricity for operation. Rather, a heat source is used, avoiding the ne ...
The term cryogenics derives from the Greek kryos, for icy cold. The upper limit that characterizes the cryogenic region of the temp ...
Separation is a unit operation used in absorption heat pumps and chemical processing applications such as solvent extraction and pr ...
Active solar hot water systems water are usable with air, liquid, vapor or liquid collector fluid or gas to liquid process. Hot ...
Micro technology can be employed to produce miniaturized refrigeration and cryocooling systems. Although process intensificat ...
A propulsion alternative is to transfer power to the vehicle and then have a magnetic structure on the vehicle that can create a moving field that, in turn, interacts with a conducting guide way to provide propulsion. This is called a short stator linear induction motor (or linear asynchronous motor), generally referred to as a Linear Induction Motor. It is possible to put the powered winding on the guide way and induce currents in a conductor on the vehicle, in which case it would be a long stator design, but this turns out to be an expensive and inefficient approach to maglev propulsion. (more…)
Electrodynamic Suspension (EDS) can be viewed as an array of magnets moving over a conducting sheet and being pushed upwards by ...
All electromagnetic suspension-based systems employ some type of feedback control mechanism to maintain stable levitation. (An inte ...
Electromagnetic Suspension (EMS) system in which an array of magnets is attracted upwards to a steel rail. It is possible to de ...
In contrast to electromagnetic suspension systems, electrodynamic suspension systems can provide stable suspension without a feedba ...
High-speed maglev technology offers four main advantages: non-contact operation; low-mass vehicles (on a per seat basis, maglev veh ...