Browsing NTNU Open by Author "Vikse, Matias"
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A Nonsmooth Approach to Modeling and Optimization - Application to Liquefied Natural Gas Processes and Work and Heat Exchange Networks
Vikse, Matias (Doctoral theses at NTNU;2020:54, Doctoral thesis, 2020)Despite their implicit presence in many process systems engineering applications, nonsmooth functions have repeatedly been shunned due to the existence of nondifferentiable points that cause issues for numerical solvers ... -
Comparison of reformulations of the Duran-Grossmann model for Work and Heat Exchange Network (WHEN) synthesis
Yu, Haoshui; Vikse, Matias; Gundersen, Truls (Journal article; Peer reviewed, 2018)Work and Heat Exchange Networks (WHENs) have received increasing attention from both researchers and engineers during the last 5-10 years. The Duran-Grossmann model (Duran and Grossmann, 1986) can deal with heat integration ... -
Design and Implementation of Modular Subroutines for Simulation of LNG Plants
Vikse, Matias (Master thesis, 2016)A nonsmooth equation-oriented multistream heat exchanger (MHEX) model has been developed by the Process Systems Engineering Laboratory at Massachusetts Institute of Technology that is intended to be a part of a rigorous ... -
Heuristic solution approach to simultaneous optimization of heat and work integration - A two-level optimization model using genetic algorithms to establish the energy target for maximum heat and work recovery
Borge, Kari Sofie Hall (Master thesis, 2017)Heat integration is of significant importance to the process industry in the efforts of reducing energy consumption and total annual costs. The heat integration problem attempts finding the optimal interconnections of ... -
Identifying optimal thermodynamic paths in work and heat exchange network synthesis
Yu, Haoshui; Fu, Chao; Vikse, Matias; He, Chang; Gundersen, Truls (Journal article; Peer reviewed, 2018)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 ... -
Model reformulations for Work and Heat Exchange Network (WHEN) synthesis problems
Yu, Haoshui; Vikse, Matias; Anantharaman, Rahul; Gundersen, Truls (Journal article; Peer reviewed, 2019)The Duran-Grossmann model can deal with heat integration problems with variable process streams. Work and Heat Exchange Networks (WHENs) represent an extension of Heat Exchange Networks. In WHEN problems, the identities ... -
Nonsmooth Analysis In Process Modeling, Design And Optimization
Barton, Paul I; Gundersen, Truls; Nielsen, Caroline J.; Vikse, Matias (Chapter, 2019)Nonsmooth models provide a powerful, compact and intuitive modeling paradigm that can represent a growing spectrum of physical phenomena over broad ranges of conditions in terms of the original process variables. This paper ... -
Nonsmooth Formulation for Handling Unclassified Process Streams in the Optimization of Work and Heat Exchange Networks
Vikse, Matias; Watson, Harry AJ; Barton, Paul I; Gundersen, Truls (Peer reviewed; Journal article, 2019)Pinch analysis provides a systematic methodology for improving efficiency through enhanced process integration. Originally, the methodology focused on heat integration with heat exchanger network (HEN) synthesis. However, ... -
Optimization of a dual mixed refrigerant process using a nonsmooth approach
Vikse, Matias; Watson, Harry; Kim, Donghoi; Barton, Paul; Gundersen, Truls (Peer reviewed; Journal article, 2020)This article uses a nonsmooth flowsheeting methodology to create simulation and optimization models for dual mixed refrigerant processes. New improved operating conditions are obtained using the primal-dual interior-point ... -
Optimization of single mixed-refrigerant natural gas liquefaction processes described by nondifferentiable models
Watson, Harry AJ; Vikse, Matias; Gundersen, Truls; Barton, Paul I (Journal article; Peer reviewed, 2018) -
Simulation of a Dual Mixed Refrigerant Process using i Nonsmooth Framework
Vikse, Matias; Watson, Harry A.J.; Barton, Paul I.; Gundersen, Truls (Journal article; Peer reviewed, 2018)Natural gas liquefaction is an energy intensive process with very small driving forces at cryogenic temperatures. Small temperature differences arise from the excessive exergy destruction that occurs from irreversible heat ... -
Simulation of dual mixed refrigerant natural gas liquefaction processes using a nonsmooth framework
Vikse, Matias; Watson, Harry AJ; Gundersen, Truls; Barton, Paul I. (Journal article; Peer reviewed, 2018)Natural gas liquefaction is an energy intensive process where the feed is cooled from ambient temperature down to cryogenic temperatures. Different liquefaction cycles exist depending on the application, with dual mixed ... -
Versatile Simulation Method for Complex Single Mixed Refrigerant Natural Gas Liquefaction Processes
Vikse, Matias; Watson, Harry AJ; Gundersen, Truls; Barton, Paul I (Peer reviewed; Journal article, 2018)Natural gas liquefaction is an energy intensive process with very small driving forces particularly in the low temperature region. Small temperature differences in the heat exchangers and high operating and capital costs ... -
Work and Heat Integration: An emerging research area
Fu, Chao; Vikse, Matias; Gundersen, Truls (Journal article; Peer reviewed, 2018)The extension from Heat Integration (HI) and design of Heat Exchanger Networks (HENs) to including heating and cooling effects from pressure changing equipment has been referred to as Work and Heat Integration and design ... -
Work and heat integration—A new field in process synthesis and process systems engineering
Yu, Haoshui; Fu, Chao; Vikse, Matias; Gundersen, Truls (Journal article; Peer reviewed, 2018)The extension from heat integration and design of heat exchanger networks (HENs) to including heating, cooling, and power effects from pressure changing equipment has been referred to as work and heat integration and design ...