Parts

Main Components:

2 Arduino Nanos

1 Brushed Coreless DC motor

2 Ultrasonic Piezoelectric Transducers

1 Driver Board For Transducers

1 Accelerometer

1 Relay

1 Boost Converter

1 I2C OLED Screen

1 Charger Module

2 Batteries

6 Dessicator Cages With Silica Gel Beads

 

Working Principle

The main mechanism behind out project is evaporative cooling. Have you ever noticed how sometimes in Singapore, a steaming hot afternoon can become delightfully chilly within seconds of a downpour? This is all due to evaporative cooling! As the water droplets fall from the clouds, it meets drier air below and starts to evaporate. In the process, the rain droplets absorb some sensible heat from the surrounding air, converting it to latent heat, which allows the water droplet to change into gaseous phase.

 

Definitions:

Sensible Heat: Heat that changes the temperature of a substance

Latent Heat: Heat energy required to overcome intermolecular forces in a substance to allow it to change phase.

This often allows temperatures in Singapore to drop from 32°C to 24°C with an hour. Our project planned to miniaturize this effect into a bottle that can cool you whether it is raining or not. We plan to simulate raindrops using Ultrasonic Piezoelectric Transducers which turns a pool of water into a fog of tiny water droplets that cool the air through evaporative cooling. We will boost this effect by pre-drying the air which enhances the evaporative cooling effect.