VietNamNet Bridge - The invention won the consolation prize at the 2016 National Innovation Competition for Teenagers and Children and the first prize at the 2016 Thua Thien – Hue provincial Innovation Competition for Teenagers and Children.

Phan Nguyen Van Khoa and Nguyen Huu Quoc Huy, ninth graders of Nguyen Van Troi Secondary School, have invented an indoor wind-run air cooler.

The two students realized that in summer, the water put in pottery-made jar is cooler than the water in other materials, partly because water slowly leaks out and evaporates quickly to cool the jar and water. 

They also noted that air cooling machines available in the market all have disadvantages. While fans blow out hot air, stream spraying fan leads to higher humidity in the air, and air conditioners consume too much power.

In summer, the water put in pottery-made jar is cooler than the water in other materials, partly because water slowly leaks out and evaporates quickly to cool the jar and water.

The machine invented by Khoa and Huy runs on a new principle. It cools the air on the basis of the rapid evaporation of water in windy conditions.

“The major source of power to run the machine is from the wind, a limitless power source, clean and environmentally friendly which does not produce greenhouse gas emissions, the reason behind global warming,” Huy said.

The machine takes full advantage of the natural evaporation thanks to wind to cool the air, and it does not consume power, and does not use the gases which harm the ozone layer such as Freon and CFC. 

Khoa and Huy put the machine into trial use in the space with the floor area of 12 square meters and the height of 3 meters, which means the total air volume of 36 cubic meters in the room.

The air temperature inside and outside the room at the moment was 32oC, while the wind speed was at third or fourth level.

After one hour of running, the machine reduced the temperature by 12oC. 

At first, the machine could not fit all houses. There was no control button which allowed to adjust the room temperature. Realizing the problems, Huy and Khoa have upgraded the product.

The machine now has two units, including one put outside and the other inside. They have also installed a control system to turn on/off and adjust the temperature, and an electrostatic dust filter system to clean indoor air. 

The latest version of the machine runs on electricity from the national grid in windless conditions. Nguyen Quoc Phuc, the teacher of Huy and Khoa said that the machine is friendly to the environment and affordable.

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