SciShow Kids has a playlist of videos titled Super Simple Machines. The videos in that playlist feature explanations and demonstrations of simple machines that students could make in your classroom. One of those videos is Spin a Wheel With Sunlight.
By watching Spin a Wheel With Sunlight students can learn how solar energy can be transferred through a solar updraft tower. The video provides clear directions on how students can make their own solar updraft towers with materials commonly found in classrooms or homes. In the example in the video, the solar updraft tower makes a pinwheel spin.