Blar i NTNU Open på forfatter "Austbø, Bjørn"
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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 ... -
Parameters relevance in data-driven models for building energy prediction
Langeland, Maria Solomon (Master thesis, 2021)Bygninger står for 40 % av verdens energiforbruk, og 36 % av drivhus gassene. En stor andel av denne energien er knyttet til bygninger, mer spesifikt, systemer for varme, ventilasjon, og kjøling (HVAC). Intelligente systemer, ... -
Parametric Optimization of a Power and Biomass to Liquid Process
Ostadi, Mohammad; Austbø, Bjørn; Hillestad, Magne (Chapter, 2019)In this study, a power & biomass to liquid process (PBtL) is optimized with respect to nine continuous design variables. These variables have great impact on the profitability of the process. A detailed process model is ... -
Power-to-Gas Methanation of Carbon Dioxide
Attanapola, Manith Randula (Master thesis, 2023)Denne masteroppgaven analyserte om Power-to-gas metanisering av en direkte metaniserings prosess modell kan operere med lavere H2/CO2. Sensitivitet analysen og optimaliseringen ble delt i to deler, en for metaniserings ... -
Predicting the performance of hybrid ventilation in buildings using a multivariate attention-based biLSTM Encoder – Decoder
Chaudhary, Gaurav; Johra, Hicham; Georges, Laurent Francis Ghislain; Austbø, Bjørn (Journal article; Peer reviewed, 2023)Hybrid ventilation is an energy-efficient solution to provide fresh air for most climates, given that it has a reliable control system. To operate such systems optimally, a high-fidelity control-oriented modesl is required. ... -
pymodconn: A python package for developing modular sequence-to-sequence control-oriented deep neural networks
Chaudhary, Gaurav; Johra, Hicham; Georges, Laurent Francis Ghislain; Austbø, Bjørn (Peer reviewed; Journal article, 2023)This paper introduces "pymodconn", a comprehensive python package developed for constructing modular sequence-to-sequence control-oriented deep neural networks. These deep neural networks (DNNs) are designed to predict the ... -
Review of Energy Storage and Energy Management System Control Strategies in Microgrids
Chaudhary, Gaurav; Lamb, Jacob Joseph; Burheim, Odne Stokke; Austbø, Bjørn (Journal article; Peer reviewed, 2021) -
Synconn_build: A python based synthetic dataset generator for testing and validating control-oriented neural networks for building dynamics prediction
Chaudhary, Gaurav; Johra, Hicham; Georges, Laurent Francis Ghislain; Austbø, Bjørn (Peer reviewed; Journal article, 2023)Applying model-based predictive control in buildings requires a control-oriented model capable of learning how various control actions influence building dynamics, such as indoor air temperature and energy use. However, ... -
Techno-economic versus energy optimization of natural gas liquefaction processes with different heat exchanger technologies
Son, Heechang; Austbø, Bjørn; Gundersen, Truls; Hwang, Jihyun; Lim, Youngsub (Peer reviewed; Journal article, 2022)The energy intensity of the natural gas liquefaction process in LNG value chains is considerable, and therefore a number of energy optimization studies have been conducted to obtain optimal operating conditions and maximize ... -
Teknisk og økonomisk beregning og design av mobile kjøleanlegg for bygg som ikke har kjøleanlegg for ventilasjonsanlegget, ved bruk av smeltevarme fra is
Løset Lindholm, Martin; Syltern, Anne; Stenersen, Tord (Bachelor thesis, 2020)I de senere år har sommertemperaturene i Norge vært over historiske normaltemperaturer. Dette har medført utfordringer med for høye temperaturer innendørs i bygninger. Spesielt har sykehjem, noe som også har vært tema i ... -
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 ... -
Tilstandsanalyse av inneklima i biblioteksmagasin under bakkenivå
Grytan, Marte; Mathisen, Vilde Amalie; Telstø, Viola Frederikke Loktu (Bachelor thesis, 2020)Oppgaven tar for seg magasin BT1 i kjelleretasjen på NTNU Gunnerusbiblioteket. Magasinet brukes til oppbevaring av arkiv- og biblioteksmateriale som krever et stabilt inneklima. Det er mottatt målinger for 2019 som viser ... -
Use of Optimization in Evaluation and Design of Liquefaction Processes for Natural Gas
Austbø, Bjørn (Doctoral thesis at NTNU;2015:33, Doctoral thesis, 2015)Liquefied natural gas (LNG) is a fast growing energy carrier suitable for transport of natural gas when the distance from source to market is long and/or the volumes are moderate. In order to liquefy the natural gas, and ... -
Ventilering i svømmehall med nytenkende utforming av avtrekk
Lindgren, Martin Bregård; Køber, Andreas; Vidvei, Lars Magnus Simonsen (Bachelor thesis, 2022)I denne oppgaven blir utfordringene ved å ventilere svømmehaller drøftet. Det blir presentert og diskutert en mulig løsning for å forbedre ventilering, folkehelse og inneklimaet i svømmehaller. Gjennom litteraturstudier, ... -
Økonomisk analyse av solfangere for tappevann i kontorbygg
Seglem, Eli Hegseth; Thorberg, Martine Grundvåg; Bjørnådal, Kristina (Bachelor thesis, 2019)Norge er et land i økonomisk vekst, der det planlegges og utvikles store byggeprosjekter hver dag. En vesentlig del av investeringskostnadene for disse prosjektene går til å dekke tekniske anlegg. Ettersom moderne bygninger ...