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TECHNICAL PAPERS: Gas Turbines: Advanced Energy Systems

Thermodynamic Optimization of the HAT Cycle Plant Structure—Part II: Structure of the Heat Exchanger Network

[+] Author and Article Information
A. Lazzaretto, F. Segato

Department of Mechanical Engineering, University of Padova, via Venezia 1, 35131 Padova, Italy

J. Eng. Gas Turbines Power 123(1), 8-16 (Jan 23, 2000) (9 pages) doi:10.1115/1.1339000 History: Received June 29, 1999; Revised January 23, 2000
Copyright © 2001 by ASME
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References

Figures

Grahic Jump Location
Composite curves in the optimum operating conditions of the basic configuration for different values of the total pressure ratio. a β=10, b β=20, c β=30
Grahic Jump Location
Grid representation of the first HEN for β=20 (two aftercoolers—two economizers). Numbers represent temperatures (°C), the heat flows (kW) and the thermal capacities (kW/°C) are included within square and round parentheses, respectively.
Grahic Jump Location
Grid representations of the four HENs fulfilling the optimal boundary conditions at the black-box boundaries for β=20; a two aftercoolers, two economizers; b one aftercooler—one economizer; c one aftercooler, two economizers; d two aftercoolers, one economizer. Numbers represent temperatures (°C); the heat flows (kW) and the thermal capacities (kW/°C) are included within square and round parentheses, respectively.
Grahic Jump Location
Optimum plant structure for β=20 (third HEN: one aftercooler—two economizers). IC2 and IC5 in the grid representation in Fig. 3c have been eliminated by mixing the stream MUW with the water flow sent to IC1 (SW3) and by imposing the HPA outlet temperature 10°C higher than the SW5 inlet temperature.
Grahic Jump Location
Grid representations of the four HENs fulfilling the optimal boundary conditions at the black-box boundaries for β=10. a two aftercoolers, two economizers; b one aftercooler—one economizer; c one aftercooler, two economizers; d two aftercoolers, one economizer. Numbers represent temperatures (°C), the heat flows (kW) and the thermal capacities (kW/°C) are included within square and round parentheses, respectively.
Grahic Jump Location
Optimum plant structure for β=10 (third HEN: one aftercooler—two economizers). IC2 and IC5 in the grid representation in Fig. 5c have been eliminated by mixing the stream MUW with the water flow sent to IC1 (SW3) and by imposing the HPA outlet temperature 10°C higher than the SW5 inlet temperature.
Grahic Jump Location
Grid representation of the HEN for β=30 (one aftercooler—one economizer). Numbers represent temperatures (°C), the heat flows (kW), and the thermal capacities (kW/°C) are included within square and round parentheses, respectively.
Grahic Jump Location
Optimum plant structure for β=30 (one aftercooler—one economizer). AC2 and EC2 in the grid representation in Fig. 7 have been eliminated by imposing the final temperatures of the streams HPA and EXG equal to the temperatures at the outlet of AC1 and EC1, respectively.

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