PH4019 Shatin Tsung Tsin Secondary School Project Holders: Fan Chun Kit (Felix) Hui Chun Kit (Gibson) Li Miu Yin (Winnie) Sze Kam Fung (Sam)
40 th Joint School Science Exhibition Competition Scientific solutions for the green revolution
Our problems -Problems we are facing now -Pollution -Global warming -Energy Crisis
Our target -Reduce the use of electricity by using -Auto lighting system -Air directing system -Solar-heating system
Auto lighting system Aims - Reduce extra lighting - Maintain a comfortable lighting environment
Auto lighting system Model
Auto lighting system Components 1.Sensors 2.Control Unit 3.LED Lighting - LED - Frame - LED Driver 4. Blinds and motor
Auto lighting system Sensors -Detect light intensity -Put at different positions
Auto lighting system The Control Unit - Implements negative feedback - Controls lighting
Auto lighting system LED Lighting - LED - Frame - LED Driver -High efficiency -No Heat Produced -No UV and infra red -Long lifespan
Auto lighting system Blinds - Control sunlight - Reduce heating effect Motor - Control the blinds
Auto lighting system Condition 1 The light intensity is too high The lighting becomes dimmer Working principle
Auto lighting system Condition 2 The light intensity is too low The lighting gets brighter
Auto lighting system Condition 3 The light intensity is extremely high The motor will lower the blinds
Air directing system Aims - To maintain a comfortable temperature in an office - Save energy for air-conditioning
Air directing system Model
Air directing system Components 1.Sensors 2.Control Unit -Manual modulator 3.Fan 4.Deflectors 5.Motors 6.Paper strips
Air directing system Sensors Movement of the deflectors - Each sensor will control only half of the deflectors
Air directing system Control Unit - Negative Feedback ~used to maintain a comfortable temperature in an office - Manual modulator ~ allow people to adjust the set temperature as they want
Air directing system Fan, deflectors and motors -Fan and deflectors are installed in the air outlet
Air directing system Fan -Control the speed of the air flow Deflectors -Facilitate air flow -Control air flow in local areas Motors -used to swing the deflectors to an appropriate position
Air directing system Paper strips - use to show the direction of the air flow
Air directing system Working principle (T= Temperature sensed by one sensor, S= range of set temperature) Condition 1: T > Upper bound of S ~The deflectors will be swung to the position of the sensor by the motors
Air directing system Working principle (T= Temperature sensed by one sensor, S= range of set temperature) Condition 2: T < Lower bound of S ~The deflectors will be swung and closed
Air directing system Working principle (T= Temperature sensed by one sensor, S= range of set temperature) Condition 3: All T < Lower bound of S ~ the speed of fan will be decreased or even stopped Condition 4: All T> Upper bound of S ~ the speed of the fan will increase
Solar Pantry Aims - To reduce the use of electricity for heating water as much as possible - To implement a clean and renewable energy source
Solar Pantry Light source Solar Panel Model Rubber tubing Water tank Window
Solar Pantry Components 1.Solar Panel 2.Rubber tubing 3.Water tank 4.Temperature sensor
Solar Pantry Solar Panel - Use solar energy for heating - Dark surface - Fluid circulation assisted by convection
Solar Pantry Water tank - Double- layered - Inner layer Spiral shaped, Metal coated - Outer layer Water circulation
Solar Pantry Temperature sensor - Detect water temperature - If the temp of heated water detected < Set temp, conventional heating would be carried out - Else, cool water would be released
Solar Pantry Water in Light source Solar Panel Temp. sensor Rubber tubing Water tank (Heat exchange occurs) Heater Cool water Mixing tank
Solar Pantry Convection current Heated water Cooler water Water with desired temp
The End