  We study the coefficient of performance (COP) and its bounds of the
Canot-like refrigerator working between two heat reservoirs at constant
temperatures $T_h$ and $T_c$, under two optimization criteria
  $\chi$ and $\Omega$. In view of the fact that an "adiabatic" process takes
finite time and is nonisentropic, the nonadiabatic dissipation and the finite
time required for the "adiabatic" processes are taken into account. For given
optimization criteria, we find that the lower and upper bounds of the COP are
the same as the corresponding ones obtained from the previous idealized models
where any adiabatic process undergoes instantaneously with constant entropy.
When the dissipations of two "isothermal" and two "adiabatic" processes are
symmetric, respectively, our theoretical predictions match the observed COP's
of real refrigerators more closely than the ones derived in the previous
models, providing a strong argument in favor of our approach.
