Solar Energy Storage
Earth Energy Bank
The Zero Carbon Solution features an inter-seasonal heat store known as the Earth Energy Bank (EEB), which preserves the heat collected in the summer for use during the winter months.
The Energy Energy Bank (EEB) is a patented energy storage method. Heated fluid is pumped from the roof through a series of pipes underneath the house, warming the surrounding earth.
Making use of it as a heat store is delightfully simple. We drill a matrix of holes 1.5 meters deep and 1.5 meters apart into which we insert some pipes which carry the solar energy from the roof into the ground.
The holes are drilled using a simple auger similar to that used for fence posts, but which go deeper into the ground. The polyethylene pipes are electro- welded into pressure tested sub-assemblies off-site and delivered to site, ready to be dropped into the bore holes.
The boreholes are then back filled with a porridge like mineral, which provides good thermal contact between the pipes and the earth. Finally the completed assembly is covered with sand and a layer of insulation placed on top.