Phạm Văn Hoàng Phương, Nguyễn Vũ Diệu Ngân, Nguyễn Hà Vy, Trịnh Song Phúc, Hoàng Tú Lam, Nguyễn Danh Bảo & Vũ Quang Minh
Finalist of the Global Children's Design-a-thon 2021, Vietnam
In our modern age, the fast growing rate of automation leads to the increasing need of energy consumption. However, the energy generated from coal, gases and so on is limited and non-renewable.
Also, one of the biggest challenges is that the unsustainable revolution causes environmental pollution.
In order to tackle the mentioned hurdles, one type of energy is considered, which is called clean energy such as solar, water and wind energy.
After some days studying on this subject, we are now interested in the energy fluctuation, and all the members decide to use it as our main power source to generate eletricity.
The product we think about is a piezoelectric generator made from piezo sensors. Piezoelectricity generates electric power based on the imbalance of connection among crystals inside. In other word, piezo electric materials turn applied mechanical stress, like pressure, soundwaves and other vibration into electricity and vice versa.
To be more details, a piezoelectric generator can be used to extract energy from ambient vibrations. For that purpose, a proof mass is firmly attached to one end of a bender, while the other end is fixed onto a vibrating case . The voltage supplied to the piezoelectric material produces internal stresses, which create active damping. The power which brakes the movement of the proof mass is not dissipated into heat but is converted into electrical power and fed back to an electrical load.
There are some considerable advantages that a piezoelectric generator can bring to us:
Firstly, the materials to make a piezoelectric sensor are easy to find and affordable.
Secondly, it requires no external power source and creates a source of clean or environmentally-friendly energy.
Thirdly, it can be applied in many fields. To illustrate, it now exists in our daily life such as watches, printers and barbeque lighter. Also, some are used under pavements on Oxford streets. Even it can provide up to 60% of the electric need in a dance club in London.
Is this world the place for children to grow up healthily and safely?
The answer is NO. We are facing the catastrophic problem relating to natural world such as:
∙ Climate change
∙ Shortage of clean energy
Firstly, I will show you some ugly facts about this world:
∙ Global warming
Which are all resulted from us, the human kind.
Luckily, our group came up with this brand new van, which is considered as the solution for the questioning problem. This van is specially designed in case we are attacked by natural disaster and don’t have anywhere to leave.
This self-powered vehicle allows us to reduce carbon footprint by recycling systems and clean energy use.
How could this tiny van provide us with organic vegetables, clean water and power. Those questions are being answered right now.
To tackle the problem, our group created this van’s model named “Green mobile house-”. How is this car separated from the ordinary ones? Are you wondering? I will show you!!
Please take a look at our design, we has included:
∙ Green space for organic gardening, all the plants are in recycling boxes and cans with rich organic fertilizer from daily waste
∙ Sewage treatment system is to collect gray drains from the kitchen, showers, and wash basins plus black drains from toilets and combine them with washing drains. These are all classified as nonhazardous drains that do not contain oil or gas contents.
∙ Water filters not only help improve the flavor of your water but also protect you from impurities such as rust particles and harmful contaminants such as bacteria and lead
∙ Our special solar panels, which are low profile and durable, used to convert sunlight into usable electricity for the whole van.
∙ Last but not least, we are proud to introduce you to a water propulsion system that enables the vehicle to float on the surface of water. The floating function belongs to the car's anti-flooding emergency feature.