  The correlation between the condensation energy and the critical temperature
is studied within a charge ordered superlattice bilayer model in which pairing
is supported by inter-layer Coulomb energy gain (potential energy driven
superconductivity).The 2D pair-condensate can be characterized by a charge
ordered state with a "checkerboard" like pattern seen by scanning tunneling
microscopy.The drop of the c-axis dielectric screening can be the primary
source of the condensation energy at optimal doping.We find that Coulomb energy
gain occurs along the c-axis, which is proportional to the measured
condensation energy ($U_0$) and to $T_c$: $E_c^{3D} \approx 2
(\xi_{ab}/a_0+1)^2 U_0 \approx k_B T_c$ and is due to inter-layer charge
complementarity (charge asymmetry of the boson condensate)where $\xi_{ab}$ is
the coherence length of the condensate and $a_0 \approx 3.9 \AA$ is the
in-plane lattice c onstant.The static c-axis dielectric constant $\epsilon_c$
is calculated for various cuprates and compared with the available experimental
data.
