There are two solar chimneys in the greenhouse.  The idea of the chimneys is to use convection principles to circulate hot air from the greenhouse into the classrooms, so that we use the heating and cooling units less.  The solar chimneys use passive heat, which means that we are saving energy.  In order to better understand how a solar chimney works and how to test to see if the chimney is working, Colm K-T created a model solar space heater from soda cans.  Below is his solar demo.   Colm also made brochures that explain the basics of the chimney.