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This paper aims at investigating the design of a freeze-drying cycle taking into account the energy utilization.Efficiency. A coffee freeze-drying process is considered as case study. The analysis is focused on the.Primary drying as this, stage accounts for most of the energy consumption. A simplified mathematical.Model is used to calculate the design space of the process with the, goal to point out the operating conditions.(temperature of the heating shelf and pressure in the drying chamber) that allow satisfying the.Constraints of the process. Experimental investigation is required to determine, model parametersNamely the coefficient of heat transfer to the product and the, resistance of the dried cake to vapor flow.The same model coupled with, equations describing the dynamics of the freeze-dryer is used, to carry out.The exergy analysis of the process thus pointing, out the operating conditions that allow minimizing the.Exergy losses and maximizing the exergy efficiency.