This volume presents both methodologies and numerical applications for the design of non-conventional unit operations in chemical processes and plants, which are rarely studied in depth at an academic level but have wide applications in the industrial sector. The first part discusses the design, comparison and optimization of heating and cooling operations that are different from simple heat exchange. The second and larger part offers a brief but effective overview of non-conventional separation processes, mainly focusing on the heterogeneous phases. Based on sample case studies, it extrapolates the process model equations and includes the numerical solution in order to provide a straightforward application example. The end of each chapter features a C++ code implementation to solve the ODE or nonlinear equations system using the BzzMath library.