Make a solar water heater: Materials needed: box (must have a lid, can be a shoe box), plastic bottle (can be a can), foam, aluminum foil (available in the scientific tool bag), transparent plastic paper, black pigment.
Experimental Steps: 1 Use a knife to cut a small hole in the lid of the can that is about the same size as the body of the bottle.
2 Open the lid of the can, fill it with foam and try to cover almost half of the bottle (to keep it warm). Put the bottle back and secure it. (Remember to fill it with water)
3. Use black paint to paint the inside and outside of the box black (favorable for light absorption)
4. Stick plastic on the space cut with a knife Membrane (can prevent air loss)
Make a support behind the 5 small boxes
Solar is over!
Heating and insulation measures:
The bottle can change its angle and be perpendicular to the sun. Do you need to support the bottle? Use aluminum foil on the back to reflect light. (It is best to conduct experiments in a hot environment)
If the solar water heater is not cleaned for a long time, there will indeed be some water pollution problems. 'water, but it won't. so serious.
1. The qualified solar water heater liner is made of SUS-2B food grade stainless steel liner, which is a national standard material. The vacuum tube is like an elongated thermos.
2. These problems are caused by long-term retention of solar energy, so the water contained in solar energy must be used frequently. The larger the capacity, the better it should be based. according to your own needsoins. Depending on the situation, the volume of solar energy should be selected according to the number of people, to ensure that the solar water is used at one time on the same day.
3. Water from solar energy is absolutely not suitable for drinking or cooking. Needless to say, even if there are no problems with solar energy, you cannot guarantee that the pipes are up to drinking water standards.
4. Solar energy should be cleaned regularly. Just like your own kettle and thermos, scale builds up over time. The cleaning cycle depends on local water quality.
Overall, it's still very good, haha, I hope it can help you