where the average specific heat capacity of the medium ̅ and the exponent n in the Eq. (11) can be evaluated as indicated in [21]. For the water heat transfer coefficient, the Yang et al. [23] correlation was used, as shown in Eq. (12). The authors evaluated the Nusselt number in a plate exchanger for single-phase flow as a function of the enlargement factor Φand the plate corrugation aspect ratio γ, both defined in [15].