Energy from noise




Energy from noise

Modern metropolis, day and night laced with noise fluctuations, the energy of which is spent on shaking of the air, while not carrying any payload. Until now, this ubiquitous hum considered only as a necessary evil – so to say, a side effect of technological evolution. But things are changing! Today, scientists believe that the knock of the wheels, the hum of the motorway, the sounds of police sirens, construction noise, stamping of feet and the human voice – all this can and should pay for the benefit of man, forcing him to produce electricity.

Skyscraper to absorb noise

We are sympathetic to people living near airports, railway stations, transport interchanges, loading docks, as well as places where construction work – because the level of noise in their homes must be unbearable! But the inhabitants of the future skyscraper «Soundscraper», which so far is at the concept stage, will be only too happy to excess noise around, because this building will produce energy from sound vibrations.

Project «Soundscraper», presented at the competition skyscrapers «eVolo 2013″, involves the construction of a skyscraper covered tens of thousands of special “cilia”, each of which will serve as a sound catcher. Collected thus kinetic energy is converted into electricity, providing a minimum needs of the building. Project authors calculated that one such facility may produce up to 150 MW / year.

“Green Noise” airports

Designer Zhou Heng-Yuey (Hung-Uei Jou) created a device «Green Noise», capable of converting decibels of noise in watts. The gadget has a view and is equipped with a speaker tripod for stability and mobility. His principal place of application conceived by the airport where every plane taking off produces noise level of about 140 decibels, which is equivalent to 240 kW of power. Thus it is easy to calculate how much electricity can be generated at an average load Airport from 300 to 500 planes a day!

System «Sonea Energy Absorbing», although it was designed for the same purpose, as a whole is more versatile. It consists of an unlimited number of absorbing elements weighing 7 pounds with dimensions of 450 X 450 X 80 mm. Each member is able to generate up to 30 watts of power, and for higher performance elements can be assembled into systems of different configurations. They may be flat, to be placed on the walls of buildings and bulky, while remaining compact enough. This makes it possible to install them inside buildings with high noise level.

Easy charging for gadgets

Studies show that a major city can make a noise equal to 70-100 decibels. So why not use it for the benefit of this most of the village? South Korean-led nanotechnology San Woo Kim (Sang-Woo Kim) are working on a system that allows to recharge a mobile phone from the street noise, playing music or just human speech.

According to Kim, the main element in a stuffing them – thin strands of zinc oxide, placed between a pair of electrodes. These filaments are attached to the ends of the sound vibrating membrane and then bend, then unbend again. This movement provides the necessary energy for the generator. Performance of such systems still insufficient for practical use, but scientists promise to greatly improve by using more efficient nanoscale generators.

Obtaining hydrogen

Scientists from the University of Wisconsin-Madison have developed a technology that will help create a cleaner hydrogen generators – the main alternative fuel of the future. Researchers have experimented the nanocrystals with zinc oxide that exhibit the piezoelectric effect under the influence of high frequency vibration. Being immersed in the liquid crystal, and piezoelectricity generated is capable of water electrolysis with hydrogen evolution.

Experimenting with the size of the crystals, the scientists were able to increase the efficiency of this process, up to 18%. This result looks promising, as conventional piezoelectric materials efficiency does not exceed 10%. If Americans put new development near the busy highway, he can generate hydrogen directly at the gas station. In addition, “amiss” any other vibration sources – for example, railroad tracks or surf. The potential is just huge!

In: Technology & Gadgets Asked By: [18418 Red Star Level]

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