The Hidden Power of Sewage St. Paul’s Co-educational College Lo Ka Shun, Parc o Tsang Tin Ki, An gela Wong Ho Gan, Alb ert Poon Wing Yiu, S arah
Jan 01, 2016
The Hidden Power of Sewage
St. Paul’s Co-educational College Lo Ka Shun, Parco
Tsang Tin Ki, AngelaWong Ho Gan, Albert
Poon Wing Yiu, Sarah
Working Principle
.• Utilize kinetic energy of running sewage
Sewage rushes down along the pipes outside buildings
Large kinetic energy spin a watermill
A dynamo changes kinetic energy to electricity
Preliminary Model
Drawbacks• Some water escapes
without spinning watermill
• Some water rebounds back onto the watermill– hinder the rotation.
Advanced Model
1.top and bottom each have a hole for the entry and exit of water
2.Slightly tilted plane
3.An arc is craved for the watermill to tuck in
4.space below the watermill is enlarged
Output Power• Measuring Setup:
– An electronic water pump – Amount of water pumped
to our model is kept at a constant
• Water velocity
=0.4516 m/s²
– AC-DC transformer in our advanced model
• Procedures:– Substituted the resistor and
– re-measure the current and voltages
– calculate output power
• Output voltage is very stable
• ~5 batteriesX 5
Output Power
Applications
• Widely used, especially in big cities like Hong Kong
• modified and installed in underground pipes to generate electricity
Further Improvement
• Further Investigation on – How many of our device is to be installed in a
pipe outside a building– What interval between devices can achieve
the maximum electrical output
• Further develop:– Use lighter material to make the watermill– Use a more corrosion resistance material
Conclusion• clean, inexpensive energy resource.
• easy to build
• applying this alternative energy resource in a large scale,
• the reliance on burning fossil fuels for energy
• environmental damage, e.g. global warming