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Identifying optimal thermodynamic paths in work and heat exchange network synthesis

Identifying optimal thermodynamic paths in work and heat exchange network synthesis

Category
Academic article
Abstract
The process synthesis problem referred to as work and heat exchange networks (WHENs) is an extension of the classical heat exchanger networks problem considering only temperature and heat. In WHENs, additional properties are pressure and work, and strong interactions exist between temperature, pressure, work, and heat. The actual sequence of heating, cooling, compression, and expansion for pressure changing streams (PCs) will affect the shape of the composite and grand composite curves, the Pinch point, and the thermal utility demands. Even stream identities (hot or cold) will sometimes change. The identification of the optimal thermodynamic path from supply to target state for PCs becomes a primary and fundamental task in WHENs. An MINLP model has been developed based on an extension of the Duran–Grossmann model (that can handle variable temperatures) to also consider changing stream identities. Three reformulations of the extended Duran–Grossmann model have been developed and tested for two examples. © 2018 American Institute of Chemical Engineers AIChE J, 2018. © 2018 American Institute of Chemical Engineers
Client
  • Research Council of Norway (RCN) / 257632
Language
English
Author(s)
Affiliation
  • Norwegian University of Science and Technology
  • SINTEF Energy Research / Gassteknologi
  • Sun Yat-sen University
Year
Published in
AIChE Journal
ISSN
0001-1541
Publisher
American Institute of Chemical Engineers
Volume
65
Issue
2
Page(s)
549 - 561