Process design refers to the design of food processes and manufacturing methods, including process flow sheets, design of processing and control equipment, and economic evaluation of the process. Plant design refers to the design of the whole processing plant, including the processing/control equipment, the utilities, the plant buildings, and the waste treatment units. The two terms are used interchangeably in the technical literature. Both process and plant design are basic parts of feasibility and implementation studies of an industrial project, such as a food processing plant.
Saravacos, G., & Kostaropoulos, A. E. (2016). Design of food processes and food processing plants. In Food Engineering Series (pp. 1–50). Springer. https://doi.org/10.1007/978-3-319-25020-5_1