  We study a microscopic model of a thermocouple device with two connected
correlated quantum wires driven by a constant electric field. In such isolated
system we follow the time-- and position--dependence of the entropy density
using the concept of the reduced density matrix. At weak driving, the initial
changes of the entropy at the junctions can be described by the linear Peltier
response. At longer times the quasiequilibrium situation is reached with well
defined local temperatures which increase due to an overall Joule heating. On
the other hand, strong electric field induces nontrivial nonlinear
thermoelectric response, e.g. the Bloch oscillations of the energy current.
Moreover, we show for the doped Mott insulators that strong driving can reverse
the Peltier effect.
