Have you ever been to the beach on a very hot day? Then I am sure you noticed that the sand is very, very hot, uncomfortably so. Congratulations, you have had first-hand experience with ground source energy storage! Now, as you were hopping across the burning sands, seeking out tufts of grass to cool your burning feet, did you ever wonder how to harness the energy stored in the sand? I have, because it’s too hot for me to read on the beach and sand is a great place to draw diagrams and write equations.
