Electric power was estimated in the large-scale flat thermoelectric panels
exposed to 2 thermal fluids. The output powers of the proposed 15 systems were
analyzed from the viewpoint of heat exchange. The new non-dimensional functions
were deduced for system design. The multiplied thermoelectric panels can
decrease their total panel area necessary for the maximum output. The output
from the multi-panels is only a few % smaller than that of 1 panel system.