Optimal integration of organic Rankine cycles with industrial processes

Waste Heat Recovery through Organic Rankine Cycles in the Bioethanol Separation Process

“…The temperatures for the process streams through the superstructure are optimization variables (continuous variables), and only a limit for the temperature difference for any match in the superstructure is imposed as ΔT min = 1°C (it should be noted that this ΔT min is just a lower limit, but the optimization process accounting simultaneously for the capital and operating costs must determine the optimal temperature differences for each match). This limit is just a feasibility constraint, but this does not fix the heat recovered; the model by Hipoĺito-Valencia et al 38 minimizes the total annual cost accounting simultaneously for the utility costs and capital costs for equipment of the HEN and ORC (turbine, pump, regenerator, evaporators, and condensers) as well as the revenue from the sale of the power produced by the ORC.…”

“…From these designs are identified their hot and cold process streams as well as the flow rates, temperatures, and physical properties; these streams are then incorporated to the superstructure reported by Hipoĺito-Valencia et al, 38 which includes an ORC to recover waste heat and produce electric power (HEN-ORC model). The superstructure is divided in stages (the number of stages corresponds to the maximum number of hot or cold process streams), and in each stage is allowed the heat exchange between any pair of hot and cold process streams (allowing in this way series, parallel, and seriesparallel arrangements).…”

“…The HEN-ORC model by Hipoĺito-Valencia et al 38 includes overall energy balances for each stream, energy balances for each stage of the superstructure, energy balances for the hot and cold utilities, energy balances for evaporators and condensers in the ORC, temperature feasibility constraints, logical relationships to determine the existence of the units required, temperature differences for the heat transfer units when these exist, energy balances for the ORC, and the objective function. This model is formulated as a mixed integer nonlinear programming (MINLP) optimization problem, and this was coded in the GAMS software.…”

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

“…Hipolito-Valencia et al [115] propose a superstructure approach to capture various possible heat transfer options between process streams and the ORC. Similar to the work by Desai and Bandyopadhyay [113], the approach focusses on the efficient integration of the ORC with the multiple source streams of the background process.…”

Bioenergy, material, and nutrients recovery from household waste: Advanced material, substance, energy, and cost flow analysis of a waste refinery process

“…Among the others, mathematical optimization modeling was applied to evaluate potential performances and limitations of waste-and biomass-to-energy systems (both thermal and biological) [16][17][18][19][20][21][22][23] and also to evaluate potential optimal solutions for maximizing energy and environmental savings in wastewater treatment [24,25], industrial production [26][27][28] and waste management strategies [29][30][31].…”