Point me toward an equation! Thermal conductivity

Hey all, I’m back with a bit of a mad scientist question for a DIY project to preheat water in a cold but very sunny environment (High Desert 4500 feet).  I’m currently… Hey all, I’m back with a bit of a mad scientist question for a DIY project to preheat water in a cold but very sunny environment (High Desert 4500 feet).  I’m currently…Read MoreGreenBuildingAdvisor