Solar Water Heaters

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Solar Water Heaters:

Solar Water Heaters

Objectives:

Objectives Define absorb, reflect, solar collector Compare the effect of black and white collectors in solar water heaters Compare the temperature change in covered and uncovered solar heaters

How can we catch the energy we receive from the Sun and put it to work for us?:

How can we catch the energy we receive from the Sun and put it to work for us?

Solar Collector:

Solar Collector Any material or object placed in the sun to absorb solar energy for transfer to water or air

PowerPoint Presentation:

Absorb – to take up, soak in, or capture Reflect – to bounce back.

Sunlight:

Sunlight

reflected (bounce back) absorbed ( soak in) :

reflected (bounce back) absorbed ( soak in)

PowerPoint Presentation:

When light is absorbed, kinetic energy increases. When kinetic energy increases, temperature usually increases.

PowerPoint Presentation:

How did the black collector make water hotter? Black containers absorb energy from the sun. As they absorb energy, they get hot.

PowerPoint Presentation:

How did the covered container make water hotter? A covered container keeps air from carrying heat away.

PowerPoint Presentation:

How did energy absorbed by black plastic heat the water? Energy absorbed by the black plastic transfers to the water by contact (conduction).

PowerPoint Presentation:

What is the best design for a solar water heater? It should be black to absorb the sun’s energy, contain water that is in contact with the collector, and have a cover to keep air from cooling the water.

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