Multiperiod work and heat integration Leandro V. Pavão, Camila B. Miranda, Jose A. Caballero, Mauro A.S.S. Ravagnani, Caliane B.B. Costa Energy Conversion and Management, 2021
A simultaneous approach for the synthesis of multiperiod heat exchanger network using particle swarm optimization Gercio P. Silva, Camila B. Miranda, Esdras P. Carvalho, Mauro A. S. S. Ravagnani Canadian Journal of Chemical Engineering, 2018 In the present paper an approach for the synthesis of multiperiod heat exchanger networks (HEN) using particle swarm optimization (PSO) is proposed, wherein all variables are optimized simultaneously. The model uses a stage‐wise superstructure in which stream splitting is considered. The HEN is synthesized for each period individually and a timesharing scheme procedure is used to integrate all the structures of different periods automatically in a unique step. The HEN is able to operate in all the considered conditions and heat transfer devices can be used for different streams in different periods. Two case studies from the literature were used to test the developed model and results for the total annual costs were better than those found in the literature.
Thermodynamically-based response time as controllability indicator in heat exchanger networks Carmen de León, Camila B. Miranda, Cid M. G. Andrade, Mauro A. S. S. Ravagnani Canadian Journal of Chemical Engineering, 2017 Recently, research and development has focused on how to integrate process design and process control, considering that the most outstanding process design does not always result in the best dynamic performance, involving plant controllability. A steady‐state controllability and resiliency analysis provides useful information for the assessment of heat exchanger networks (HEN) and requires less work than the dynamic analysis. In the interests of obtaining the best balance between process integration and controllability, a thermodynamic analysis from the dissipative point of view can be a starting point. This paper presents a simultaneous approach for finding controllability and economic goals in early stages of process design. An index based on response time is obtained, which is a controllability measure of the system. It is applied to a HEN and the results obtained are compared with known controllability and resiliency measures tools on steady state, showing consistency. The proposed methodology serves as a starting point for controllability evaluation, making it possible to relate the stages of process control and design.
