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Compressed air as fuel


L'compressed aircan be used asfuelin particular vehicles or used forenergy storage. The accumulation of energy in the form ofcompressed airis a strategy suitable forto preservethe electricity generated in periods of low demand. L'poweraccumulated in the form ofcompressed airit is then supplied to meet the electricity needs during peak hours.

For thephysical law of gases, when pressure tends to generate heat, so toocompressed airinevitably becomes hot after compression. At a constant temperature, during expansion the gas tends to lose heat, if the heat generated during theair compressionit can be stored and used during expansion (to heat the same gas), the storage efficiency increases considerably. In energy storage systems in the form ofcompressed airthere are several ways of managing heat.

Given the potential ofcompressed air, since the 1990s several companies have attempted to develop vehicles powered by compressed air. Thecompressed air carthey boast of not causing any kind of road pollution, are low cost and see the use of simple cooking oil to lubricate the integrated system that manages thecompressed airas a fuel.

Since the first prototypes of the nineties, only today are the first ones spreadingcarmass produced with power supply adcompressed air. In Europe, the first plant for the production ofcompressed air vehiclesis located in Italy, in Sardinia, (Bolotana, Nuoro) and is managed by Airmobility (find out more about "compressed air cars" with the article "Airpods, the compressed air car“).

The time it takes to fill a tank withcompressed air,with current technologies, it amounts to just 2.5 minutes using a special cylinder. A full ofcompressed airit costs around 4 euros and allows you to travel around 100 km.

The transfer of a gaseous volume from a "compressed air accumulator" to the car tank requires short times, a bit more cumbersome is if you try to transfer compressed air using an instant compressor, perhaps carried on board the vehicle itself ... in this case the times go up to a few hours because before "filling up", the air will have to be compressed in advance.

Refueling on the upcoming AirPods compressed air it can take place through the appropriate stations (2.5 minutes are enough for a full tank) or through the slower household electrical outlet (at least 10 kW), with a timing of 3.5 hours.



Video: Compressed air vehicle Mechanical Engineering Project, BIS College Moga, Punjab (October 2021).