• Comparison of Liquefaction Processes for FLNG 

      Kim, Donghoi; Gundersen, Truls (Journal article, 2018)
      This paper conducts a comparative evaluation of natural gas liquefaction processes developed for floating facilities. The simulation results are analyzed, focusing on thermodynamic efficiency, compactness, safety, and ...
    • 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 ...
    • Development and use of exergy efficiency for complex cryogenic processes 

      Kim, Donghoi; Gundersen, Truls (Journal article; Peer reviewed, 2018)
      In this paper, exergy efficiencies, which are effective performance parameters for cryogenic processes, are categorized based on their exergy decomposition levels. However, the existing efficiencies are not standardized ...
    • Evaluation and Optimization of Processes in the Liquefied Natural Gas (LNG) Value Chain 

      Kim, Donghoi (Doctoral theses at NTNU;2019:63, Doctoral thesis, 2019)
      As a cleaner fuel and an intermediate energy source on the way to a carbon-free society, the demand for natural is expected to grow considerably. Consequently, a larger production of liquefied natural gas (LNG) is also ...
    • Helium Extraction from LNG End Flash 

      Kim, Donghoi (Master thesis, 2014)
      Helium is an invaluable element as it is widely used in industry such as cryo-genics and welding due to its unique properties. However, helium shortage is expected in near future because of increasing demand and the anxiety ...
    • Integration of LNG Regasification and Air Separation Units 

      Giametta, Roxane Edith Helene (Master thesis, 2017)
      Through the various LNG cold recovery applications, cryogenic air separation is the only one recovering the coldest range of exergy, which is also the most valuable. Several designs of integrated ASU and LNG regasification ...
    • Low Temperature Applications for CO2 Capture in Hydrogen Production 

      Kim, Donghoi; Berstad, David Olsson; Anantharaman, Rahul; Straus, Julian; Peters, Thijs; Gundersen, Truls (Chapter, 2020)
      The recent development of the protonic membrane reformer (PMR) technology allows an energy efficient hydrogen production from natural gas. To liquefy and separate CO2 from the retentate gas of the PMR, various low temperature ...
    • Modeling and Simulation of a Waste Tire to Liquefied Synthetic Natural Gas (SNG) Plant 

      Rammohan Subramanian, Avinash Shankar; Kim, Donghoi; Adams, Thomas; Gundersen, Truls (Chapter, 2019)
      Thermochemical conversion of solid wastes through gasification offers the dual benefit of production of high-value fuels from the recovered energy and environmentally friendly waste disposal. Waste tires in particular may ...
    • Multi-component Fluid Cycles in Liquid Air Energy Storage 

      Liu, Zhongxuan; Kim, Donghoi; Gundersen, Truls (Peer reviewed; Journal article, 2020)
      With the penetration of renewable energy sources into the energy market, an emerging problem is the energy stability during energy supply and delivery. Energy storage technologies have the ability to overcome the intermittent ...
    • Optimal Use of Liquefied Natural Gas (LNG) Cold Energy in Air Separation Units 

      Kim, Donghoi; Giametta, Roxane Edith Helene; Gundersen, Truls (Peer reviewed; Journal article, 2018)
      One of the solutions to utilizing liquefied natural gas (LNG) cold energy at import terminals is supplying it to an air separation unit (ASU), replacing an external refrigeration process and reducing the power consumption. ...
    • 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 NGL Extraction Processes for Floating LNG Processes 

      Sætre, Daniel (Master thesis, 2016)
      Removal of heavy hydrocarbons from natural gas streams is necessary in all liquefaction processes to prevent freeze-out in the main cryogenic equipment. In addition, more valuable products are obtained giving the process ...
    • Organic Rankine Cycle with Pure and Mixed Working Fluids for LNG Cold Energy Recovery 

      Yu, Haoshui; Kim, Donghoi; Hu, Xiangping; Gundersen, Truls (Journal article; Peer reviewed, 2019)
      Liquefied Natural Gas (LNG) contains a large amount of cold exergy, which is normally wasted during the regasification process. Organic Rankine Cycles (ORCs), which have been widely employed for low-temperature waste heat ...
    • Process design and economic optimization of boil-off-gas re-liquefaction systems for LNG carriers 

      Kim, Donghoi; Hwang, Chulmin; Gundersen, Truls; Lim, Youngsub (Peer reviewed; Journal article, 2019)
      Recent LNG carriers are equipped with high pressure gas injection engines. However, there has been a lack of research on liquefaction processes for boil-off gas (BOG) on LNG ships driven by high pressure fuel. Thus, this ...
    • A study of working fluids for Organic Rankine Cycles (ORCs) operating across and below ambient temperature to utilize Liquefied Natural Gas (LNG) cold energy 

      Yu, Haoshui; Kim, Donghoi; Gundersen, Truls (Peer reviewed; Journal article, 2019)
      Liquefied Natural Gas (LNG) contains significant amounts of cold exergy, which is normally wasted during regasification at receiving terminals. This paper addresses working fluid screening for Organic Rankine Cycles (ORCs) ...
    • Use of exergy efficiency for the optimization of LNG processes with NGL extraction 

      Kim, Donghoi; Gundersen, Truls (Peer reviewed; Journal article, 2020)
      In this paper, processes for liquefied natural gas (LNG) production with upstream or integrated natural gas liquids (NGL) removal have been optimized and compared. Since the NGL and LNG production systems use both work and ...