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PH4019

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.

joan-mcdonald
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PH4019

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  1. PH4019 Shatin Tsung Tsin Secondary School Project Holders: Fan Chun Kit (Felix) Hui Chun Kit (Gibson) Li Miu Yin (Winnie) Sze Kam Fung (Sam)

  2. 40th Joint School Science Exhibition Competition Scientific solutions for the green revolution

  3. Our problems • Problems we are facing now • Pollution • Global warming • Energy Crisis

  4. Our target • Reduce the use of electricity by using • Auto lighting system • Air directing system • Solar-heating system

  5. Auto lighting system • Aims • Reduce extra lighting • Maintain a comfortable lighting environment

  6. Auto lighting system Model

  7. Auto lighting system • Components • Sensors • Control Unit • LED Lighting- LED • - Frame • - LED Driver • 4. Blinds and motor

  8. Auto lighting system Sensors • Detect light intensity • Put at different positions

  9. Auto lighting system The Control Unit - Controls lighting • Implements negative feedback

  10. Auto lighting system LED Lighting - LED - Frame - LED Driver • High efficiency • No Heat Produced • No UV and infra red • Long lifespan

  11. Auto lighting system Blinds • Control sunlight • Reduce heating effect Motor • Control the blinds

  12. Auto lighting system Working principle Condition 1 The light intensity is too high The lighting becomes dimmer

  13. Auto lighting system Condition 2 The light intensity is too low The lighting gets brighter

  14. Auto lighting system Condition 3 The light intensity is extremely high The motor will lower the blinds

  15. Air directing system • Aims • To maintain a comfortable temperature in an office • Save energy for air-conditioning

  16. Air directing system Model

  17. Air directing system • Components • Sensors • Control Unit • Manual modulator • Fan • Deflectors • Motors • Paper strips

  18. Air directing system Sensors - Each sensor will control only half of the deflectors Movement of the deflectors

  19. 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

  20. Air directing system Fan, deflectors and motors • Fan and deflectors are installed in the air outlet

  21. 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

  22. Air directing system Paper strips - use to show the direction of the air flow

  23. 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

  24. 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

  25. 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

  26. Solar Pantry Aims - To reduce the use of electricity for heating water as much as possible - To implement a clean and renewable energy source

  27. Solar Pantry Model Window Water tank Light source Rubber tubing Solar Panel

  28. Solar Pantry • Components • Solar Panel • Rubber tubing • Water tank • Temperature sensor

  29. Solar Pantry Solar Panel- Use solar energy for heating - Dark surface - Fluid circulation assisted by convection

  30. Solar Pantry Water tank- Double- layered - Inner layer Spiral shaped, Metal coated - Outer layer Water circulation

  31. 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

  32. Solar Pantry Water in Water tank (Heat exchange occurs) Cool water Heater Light source Temp. sensor Rubber tubing Mixing tank Solar Panel

  33. Solar Pantry Heated water Cooler water Water with desired temp Convection current

  34.  The End 

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