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23.05.2015

The problem of energy efficiency is solved not only by turning off the light in time: buildings must be built so that they can be easily heated in winter and cooled in summer. At the same time, the roof plays a decisive role; it is not for nothing that it is so carefully insulated.

However, the modern solution to the roof problem is to plant it with plants. For two decades, this technology has reached a high level, but many architects find it difficult to use it. In particular, they are unsure if the roof will deliver the claimed energy efficiency and lower cooling and heating costs for the building. Otherwise, it is difficult to convince the customer to go for additional costs.

A new mathematical model, built by engineers from the Polytechnic University of Madrid, made it possible to carry out an accurate calculation. It turned out that a densely planted roof can reduce the flow of heat coming to the building in summer by 60%.

For the city, the effect is even more significant - a green roof reflects only 9% of the incident heat. This is very important, because it is known that the thermal cap that occurs around megacities noticeably changes the climate within a radius of kilometers from its borders. True, a densely planted roof does not immediately become, because green friends need time to get stronger and become covered with leaves. While they have not grown, energy efficiency will not grow either.

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The electric flying race car has flown for the first time in Australia, in preparation for a series of remotely piloted aircraft races later this year. A four-meter multicopter Alauda Airspeeder Mk3 made its first unmanned test flight in the desert of South Australia.

With a weight of 130 kg, the aircraft has a specific thrust that exceeds that of some modern fighters. Alauda Aeronautics founder Matthew Pearson said the test vehicle will be raced in Formula One style, with up to ten similar aircraft in each "race". Three such races are planned for 1, the date and location of which have not yet been announced. Depending on the terrain, flying electric vehicles will travel at speeds of 2021 to 150 km/h, Pearson said.

There is a place for a pilot in the cockpit of the vehicle, but at the moment the control takes place remotely: a robot sits in the cockpit, connected to the pilot on the ground. The mechanism duplicates all the actions of the pilot, as if he himself controls the aircraft. In the event remote-controlled racing goes off without incident, the company hopes to allow people to fly in the future. It is worth noting that, in order to avoid collisions in the air, Alauda Airspeeder Mk3 is equipped with LiDAR sensors and a radar system.

The vehicle is powered by a lithium-polymer battery, the charge of which is enough for 15 minutes of flight. Each race will last 45 minutes, requiring two pit stops to change the battery, which takes about 20 seconds.

Pearson expressed his hope that the Airspeed EXA series will improve the safety of flying vehicles. Many analysts and scientists see great promise in compact flying electric vehicles. It is expected that in the not too distant future, compact air transport will be used for the delivery of goods, and later for passenger transportation.

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