why do we have almost two thirds of energy produced wasted.
de nada sirve que las industrias optimicen energía mientras que las personas no ahorren energía.
It is important to produce energy based on demands to avoid energy wastage.Energy efficiency appliance can be used e.g bulb and solar geysers can be installed.
What is Energy efficiency?
The efficiency with which humanity currently uses its energy sources is generally extremely low. At present, only about one-third of the energy content of the fuel the world uses emerges as ‘useful’ energy, at the end of the long supply chains we have established to connect our coal and uranium mines, our oil and gas wells, with our energy-related needs for warmth, light, motion, communication, etc.
The remaining two-thirds usually disappears into the environment in the form of ‘waste’ heat. One of the reasons for our continuing inefficiency in energy use is that energy has been steadily reducing in price, in real terms, over the past 100 years. Energy's decreasing cost means that our society has only a relatively weak financial incentive to use it more wisely.
The chains that link energy supplies with users’ demands are lengthy and complex. Each link in the chain involves converting energy from one form or another, for example in the burning of coal to generate electricity; or distributing energy via some kind of transmission link or network, such as a national electricity grid or gas pipeline infrastructure.
On the supply side of our energy systems, there is a very large potential for improving the efficiency of electricity generation by introducing new technologies that are more efficient than older power plant.
The efficiency of a power plant is the percentage of the energy content of the fuel input that is converted into electricity output over a given time period. Since the early days of electricity production, power plant efficiency has been improving steadily.
The most advanced form of fossil-fuelled power plant now available is the Combined Cycle Gas Turbine (CCGT).
CCGTs are more than 50% efficient, compared with the older steam turbine power plant that is still in widespread use, where the efficiency is only about 30%, and thus two-thirds of the energy content of the input fuel is wasted in the form of heat, usually dumped to the atmosphere via cooling towers.
CCGTs are more ‘climate friendly’ than older, coal-fired steam turbine plant, not only because they are more efficient but also because they burn natural gas, which on combustion emits about 40% less CO2 than coal per unit of energy generated.
Overall, taking into account both the higher efficiency and natural gas's lower CO2 emissions, when compared with traditional coal-fired plant CCGT-based power plants release about half as much CO2 per unit of electricity produced. Most of the reductions that occurred in Britain's CO2 emissions during the 1990s were due to the so-called ‘dash for gas’ as a substitute for coal in power generation.
Improving the sustainability of energy use by applying demand-side measures involves two distinct approaches, one technological, the other social.
The technological approach involves installing improved energy conversion (or distribution) technologies that require less input energy to achieve a given level of useful energy output or energy service.
The social approach involves re-arranging our lifestyles, individually and collectively, in minor or perhaps major ways, in order to ensure that the energy required to perform a given service is reduced in comparison with other ways of supplying that service.
You may live in a densely populated town with shops, offices, schools and other amenities scattered evenly around. You may be able to do your shopping, go to work, and take the children to school without using a car, simply by walking relatively short distances.
Or you may find it convenient to catch a bus, as bus services are usually more frequent and efficient in higher-density settlements.
On the other hand, you may live in a town with a similar population, but one that has been designed (as have many new towns) to have a low population density (i.e. fewer residents per hectare of land), with shops and offices concentrated in the town centre. In this case, you may well use a car for many of your local journeys, consuming fossil fuels and generating emissions of greenhouse gases and other pollutants.
In both towns, the residents receive exactly the same levels of service: shopping, working, schooling, etc. But in the high-density town the residents can use energy services more sustainably than in the low-density town - all other things being equal.
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