ph4019 shatin tsung tsin secondary school project holders: fan chun kit (felix) hui chun kit...
TRANSCRIPT
PH4019Shatin Tsung Tsin Secondary School
Project Holders: Fan Chun Kit (Felix) Hui Chun Kit (Gibson) Li Miu Yin (Winnie) Sze Kam Fung (Sam)
40th 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
Components1. Sensors2. Control Unit3. 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 systemModel
Air directing system
Components1. Sensors2. Control Unit
- Manual modulator3. Fan4. Deflectors5. Motors6. Paper strips
Air directing system
Sensors
Movement of the deflectors
- Each sensor will control only half of the deflectors
Air directing systemControl 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 systemFan, deflectors and motors
-Fan and deflectors are installed in the air outlet
Air directing systemFan
-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 systemPaper strips
- use to show the direction of the air flow
Air directing systemWorking 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 systemWorking 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 systemWorking 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 tankWindow
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