Cómo hacer un calentador de agua solar tipo cilindro parabólico

  

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  • Autor solarschoolsjp
  • Idioma Japonés
  • Canal YouTube
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Parabolic Troughs are one way to capture solar energy for heating. Some commercial systems heat water, salt or oil and convert the energy to turn a turbine that generates electricity. Automated troughs are often used to track the Sun's rays throughout the day.
In this experiment you will learn how different size collectors will change the amount of energy captured. Although strictly speaking, a half circle is not a parabola, sunlight from the reflective surface will substantially heat the tube in the center.
What you need:
2m 12mm copper tubing
1m 140mm PVC pipe
3m 9cm x 2cm wood
2 thermometers 80C
3m plastic tube to fit the copper pipe
4 bulldog clips
saw and drill
16 4.5cm screws
sand paper
flat black paint
2m reflective adhesive foil
What you need to do:
1. Sandpaper the copper tubing and paint black
2. Cut 10cm off the end of the PVC pipe using a hand saw
3. Cut a line down the length of the PVC pipe using a handsaw. To stop the saw from getting stuck, use a bolt as a wedge to keep the gap open
4. Make another cut on the opposite side of the pipe to make a trough half of the diameter of the pipe
5. Using one half of the pipe, cut a piece to make the trough one third of the diameter of the pipe. Repeat the following instructions for each trough.
6. Cut the reflective adhesive foil into pieces and cover the inside of the trough
7. Place the trough on the piece of wood and trace the inside of the trough
8. Use a saw to cut out the trough ends
9. Place a mark, half of the radius length, from the deepest part of the semi circle on the trough ends and drill a hole in the trough ends big enough to let the copper pipe pass through.
10. Drill holes and use the two screws on each end of the pipe to secure the trough ends to the trough.
11. Cut a length of wood the same length of the trough to make a trough stand.
12. Cut 2 15cm lengths of wood and drill a hole 1.5cm from the top of each block to accommodate the copper pipe.
13. Secure the trough stand ends to the base with two large screws.
14. Insert the copper tubing through the stand and through the trough to ensure the tube extrudes either side of the stand.
15. Screw a flat ended screw into the tap of the stand to act as a lock for the trough position. Take care not to pierce the pipe.
Experiment.
1. Cut 2 10cm pieces of plastic tubing and attach to the ends of each trough and fold and clamp with the clips to prevent water escaping.
2. Cut 2 50 cm pieces of tubing and insert a thermometer into each tube neat the end of the copper pipe.
3. Fill each tube with tap water, trying to remove any water bubbles.
4. Seal the end of the tube with a clamp
5. Align both parabolas to the sun.
6. Wait one hour and compare the temperature of the half pipe collector with the quarter pipe collector.
Questions.
1. Was there a difference in temperature?
2. When would it be better to use a shallow trough as opposed to a deep trough?
3. What other experiments could you do with these troughs?

Más información: http://www.solarschools.jp

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