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A new demonstration of the MSU counter-flow model was derived, using the air entering side as point zero for the control volume, and the product entering side as its end. This approach changed to negative the signals of the air temperature and humidity ratio ordinary differential equations, which gave to their solution a convergence characteristic like the MSU concurrent flow model. Now is possible to simulate the counter-flow drying portion of the cascade dryer, as well as the cooling section of any dryer which cares for product quality and energy efficiency. The improved MSU counter flow drying and cooling model requires a rewetting equation for the product instead of a drying equation as in the other models. This opens another research area for agricultural engineers interested on the post-harvesting activities.