Blar i NTNU Open på forfatter "Hashemi, Sayed Ebrahim"
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Cryogenic vs. absorption biogas upgrading in liquefied biomethane production – An energy efficiency analysis
Hashemi, Sayed Ebrahim; Sarker, Shiplu; Lien, Kristian Myklebust; Schnell, Sondre Kvalvåg; Austbø, Bjørn (Journal article; Peer reviewed, 2019)Production of liquefied biomethane (LBM) from biogas comprises two major energy intensive processes; upgrading to increase the methane concentration and refrigeration to liquefy the upgraded biogas. Amine-based absorption ... -
Development and Optimization of Processes for Liquefied Biomethane Production
Hashemi, Sayed Ebrahim (Doctoral theses at NTNU;2022:107, Doctoral thesis, 2022)The contribution of renewable energies to the globally fast-expanding transport sector is the lowest among the other sectors like power generation. Many alternative fuels have been suggested to boost the green transition ... -
Molecular Microbial Community Analysis as an Analysis Tool for Optimal Biogas Production
Hashemi, Seyedbehnam; Hashemi, Sayed Ebrahim; Lien, Kristian Myklebust; Lamb, Jacob Joseph (Peer reviewed; Journal article, 2021)The microbial diversity in anaerobic digestion (AD) is important because it affects process robustness. High-throughput sequencing offers high-resolution data regarding the microbial diversity and robustness of biological ... -
Objective Function Evaluation for Optimization of an Amine-Based Biogas Upgrading and Liquefaction Process
Hashemi, Sayed Ebrahim; Kim, Donghoi; Austbø, Bjørn (Peer reviewed; Journal article, 2022)Conventionally, liquefied biomethane (LBM) is produced through biogas upgrading followed by a liquefaction process. In the present study, a detailed model for an LBM production plant including amine-based biogas upgrading ... -
Optimization of an Absorption-Based Biogas Upgrading and Liquefaction Process
Hashemi, Sayed Ebrahim; Lien, Kristian Myklebust; Schnell, Sondre Kvalvåg; Austbø, Bjørn (Journal article; Peer reviewed, 2019)The present work proposes a methodology for optimization of a liquefied biomethane (LBM) production plant. The LBM production plant comprises amine-based absorption upgrading followed by a single expander refrigeration ... -
Optimization of hydrogen liquefaction process with mixed refrigerant precooling
Fosstveit, Morten (Master thesis, 2021)Hovedmålet med denne masteroppgaven er å finne en optimal for-kjølingstemperatur mellom 80-120 K for en optimalisert 100 tdp flytende hydrogenprosess ved å bruke MR for-kjølingssyklus, og å utføre en eksergianalyse på den ... -
Thermodynamic analysis of different methanation reactors for biogas upgrading
Hashemi, Sayed Ebrahim; Lien, Kristian Myklebust; Schnell, Sondre Kvalvåg; Austbø, Bjørn (Peer reviewed; Journal article, 2020)Biomethane production from biogas can be increased by methanation of carbon dioxide with hydrogen through the Sabatier reaction. In this work, the performance of the methanation process is investigated under isothermal and ... -
Thermodynamic Insight in Design of Methanation Reactor with Water Removal Considering Nexus between CO2 Conversion and Irreversibilities
Hashemi, Sayed Ebrahim; Lien, Kristian Myklebust; Hillestad, Magne; Schnell, Sondre Kvalvåg; Austbø, Bjørn (Journal article; Peer reviewed, 2021)The inevitable nexus between energy use and CO2 emission necessitates the development of sustainable energy systems. The conversion of CO2 to CH4 using green H2 in power-to-gas applications in such energy systems has ...