Dry Cells
Many Dry Cells are influenced by the Tero Electrolyzer or the more complex electronics driven Bob Boyce designs. They are sometimes referred to as "Isolated Series Cells, "Cell Stacks" or "Flooded Dry Cells (to name a few)".
Though the electrodes are still flooded, Dry Cells are considered "dry" because the electrodes are separated from the reservoir. The electrolyte is contained between the electrodes, rather than around them. This design greatly improves efficiency by reducing parasytic current losses that accur at the edges of the electrodes.
Typically, a Dry Cell is usually made of stainless steel electrodes separated by gaskets. The gaskets separate each electrode which has holes to allow the electrolyte level between each electrode to equalize. Plates at either end hold all the electrodes and gaskets together with bolts.
When the electrodes are energized, HHO is produced and escapes out a hole placed at the top of one of the end plates. In the Tero Electrolyzer the bubbling HHO carries electrolyte with it to the reservoir, which acts as a gas separator. This is considered a self-pumping mechanism. The HHO and electrolyte flow up through the reservoir, together, where the electrolyte is left in the reservoir and the HHO escapes out a port installed at the top of the reservoir. The remaining electrolyte is cycled back into the Dry Cell, where the process continues.
Tero-inspired Dry Cells are considered a closed loop system, in which the reservoir acts as a water-gas separator, or "pre-bubbler". In the Bob Boyce inspired electrolyzers, the electrodes have no holes in them, further reducing current losses.
One could think of theese designs as a hybrid between the Wet and Dry cell. The electrode edges are isolated as in a Dry Cell, but the cell container also serves as the reservoir. Generally, the electrolyte levels stay below the top of the plates, and the HHO is collected at the top of the container. Dry Cells are highly efficient, and tend to produce larger quantities of HHO with less energy.