  The superconducting proximity effect is known to modify transport properties
of hybrid normal--superconducting structures. In addition to changing
electrical and thermal transport separately, it alters the thermoelectric
effects. Changes to one off-diagonal element $L_{12}$ of the thermoelectric
matrix $L$ have previously been studied via the thermopower, but the remaining
coefficient $L_{21}$ which is responsible for the Peltier effect has received
less attention. We discuss symmetry relations between $L_{21}$ and $L_{12}$ in
addition to the Onsager reciprocity, and calculate Peltier coefficients for a
specific structure. Similarly as for the thermopower, for finite phase
differences of the superconducting order parameter, the proximity effect
creates a Peltier effect significantly larger than the one present in purely
normal-metal structures. This results from the fact that a nonequilibrium
supercurrent carries energy.
