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Solar Water Heaters. 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.

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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
solar collector
Solar Collector

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

slide11

When light is absorbed, kinetic energy increases.

  • When kinetic energy increases, temperature usually increases.
slide13

How did the black collector make water hotter?

  • Black containers absorb energy from the sun. As they absorb energy, they get hot.
slide14

How did the covered container make water hotter?

  • A covered container keeps air from carrying heat away.
slide15

How did energy absorbed by black plastic heat the water?

  • Energy absorbed by the black plastic transfers to the water by contact (conduction).
slide16

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.