Transcript The Hidden Power of Sewage

The Hidden Power of Sewage
St. Paul’s Co-educational College
Lo Ka Shun, Parco
Tsang Tin Ki, Angela
Wong Ho Gan, Albert
Poon Wing Yiu, Sarah
How much sewage we Hong
Kong people produce each day?
X 1400
2.6 million cubic metres!!
Working Principle
. energy of running sewage
• Utilize kinetic
Sewage rushes down along the pipes
outside buildings
Large kinetic energy spin a watermill
A dynamo changes kinetic energy to
electricity
Preliminary Model
1.5 metres long plastic PVC water pipe
plastic box
with a watermill
Preliminary Model
 Drawbacks
• Some water escapes
without spinning
watermill
• Some water rebounds
back onto the
watermill
– hinder the rotation.
Advanced Model
2.Slightly tilted plane
3.An arc is craved for
the watermill to tuck in
4.space below the
watermill is enlarged
1.top and
bottom each
have a hole
for the entry
and exit of
water
Advanced Model
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
Output Power
• Procedures:
– Substituted the resistor and
– re-measure the current and voltages
– calculate output power
• Output voltage is very stable
• ~5 batteries
X5
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
Thank You!