Make those microbes warm up water. Pupils first investigate water pumps, then design a water circulation system that uses solar energy. A bioreactor in the system takes energy from compost and helps heat water.

Concepts

energy, heat transfer, organic material, composting, radiant energy

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Instructional Ideas

• Invite parents or community members familiar with composting to give a presentation
  

Classroom Considerations

• Scholars should have knowledge with bioreactors and solar heaters from the previous lessons
• This is the last of three parts in the Bioreactor Water Heating unit
• Lesson takes three to four days over the course of several months
  

Pros

• Includes a handout with diagrams of water heating systems
  
• Provides some suggestions for lesson extensions
  

Cons

• None