Sumários
Heat Integration in Aspen
23 outubro 2024, 16:00 • Pedro Castro
Targeting minimum utility consumption in Aspen using Energy Analysis, after choosing available utilities from database. Stream segmentation for more accurate targets. Estimating heat exchangers areas and annualized capital cost. Four different methods in Aspen Energy Analyzer for designing an heat exchanger network with focus on retrofit mode and manual design procedure for generating the maximum energy recovery network (for the regions above and below the pinch).
Heat Integration in Aspen
23 outubro 2024, 13:30 • Pedro Castro
Targeting minimum utility consumption in Aspen using Energy Analysis, after choosing available utilities from database. Stream segmentation for more accurate targets. Estimating heat exchangers areas and annualized capital cost. Four different methods in Aspen Energy Analyzer for designing an heat exchanger network with focus on retrofit mode and manual design procedure for generating the maximum energy recovery network (for the regions above and below the pinch).
Minimizing the total capital cost of a heat exchanger network with Mathematical Programming
22 outubro 2024, 16:00 • Pedro Castro
Non-Linear Programming model for minimizing the total capital cost of a heat exchanger network (HEN) given the utility loads for every pair of hot and cold streams/utilities. Hands-on session in GAMS for writing the missing parameters and running the model for the total network and the regions above and below the pinch. Representation of the superstructures for hot stream H1 and cold stream C1 (full network). Extracting the optimal values of the heat capacity flowrates and inlet and outlet temperatures from the GAMS results file, to eliminate inactive streams in the superstructure . Representation of the active structure for streams H1 and C1 to show that all constraints are verified in the global optimal solution. The BARON solver was used for global optimization.
Minimizing the total capital cost of a heat exchanger network with Mathematical Programming
22 outubro 2024, 13:30 • Pedro Castro
Non-Linear Programming model for minimizing the total capital cost of a heat exchanger network (HEN) given the utility loads for every pair of hot and cold streams/utilities. Hands-on session in GAMS for writing the missing parameters and running the model for the total network and the regions above and below the pinch. Representation of the superstructures for hot stream H1 and cold stream C1 (full network). Extracting the optimal values of the heat capacity flowrates and inlet and outlet temperatures from the GAMS results file, to eliminate inactive streams in the superstructure . Representation of the active structure for streams H1 and C1 to show that all constraints are verified in the global optimal solution. The BARON solver was used for global optimization.
Targeting minimum number of heat-exchanger units with Mathematical Programming
17 outubro 2024, 16:00 • Pedro Castro
Mixed-Integer Linear Programming model for finding the minimum number of units given the heat loads to be supplied by hot streams and utilities to cold streams and utilities in each temperature interval (expanded transshipment model by Papoulias & Grossmann, 1983). Hands-on session in GAMS for: (i) writing the missing objective function and model constraints, which involve heat balances for each hot and cold stream/utility in each interval, and the activation of binary variables identifying a match between a pair of hot and cold stream/utility in case there is an heat load exchanged between the two; (ii) generating the corresponding heat-exchanger network (HEN) for the regions above and below the pinch. The HEN for the full network is much more difficult to derive (it involves stream mixing and splitting) given the heat loads between every pair of streams, requiring a systematic procedure.