Browsing NTNU Open by Author "Tolstorebrov, Ignat"
Now showing items 41-60 of 79
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Low temperature drying and thermo-physical Properties of Brown seaweeds (Saccharina latissima)
Tolstorebrov, Ignat; Eikevik, Trygve Magne; Bantle, Michael (Chapter, 2017)The drying kinetics of brown seaweed Sacharina Latissima with and without blanching were investigated in temperature range between 10.0 and 38.0 °C. The drying process is more rapid for raw seaweeds. The effective moisture ... -
Low Temperature Plate Freezing of Fish on boats using R744 as Refrigerant and Cold Thermal Energy Storage
Verpe, Espen Halvorsen (Master thesis, 2018)The introduction of low temperature R744 freezing systems enables lower evaporating temperatures and faster freezing times, however, also a lower system efficiency (COP). This thesis will investigate how low temperature ... -
Modeling and simulation of oil-free liquid-injected screw compressors using ammonia-water mixture as working fluid
Ahrens, Marcel Ulrich; Tønsberg, Even Kristian; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne (Chapter, 2022)This study investigates the compression process of an oil-free screw compressor with liquid injection for an absorption-compression heat pump (ACHP) with an ammonia-water mixture as working fluid. In recent years, several ... -
Modelling Approach for a Liquid-Injected Ammonia-Water Screw Compressor
Ahrens, Marcel Ulrich; Tønsberg, Even Kristian; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne (Chapter, 2021)The present work focuses on a modelling approach for a liquid-injected ammonia-water screw compressor for combined absorption-compression heat pumps (CACHP) at high-temperature operation. The CACHP system combines the ... -
Modelling of Crystallization During Freeze-Concentration of Hydrolysates
Khan, Muhammad Umar; Tolstorebrov, Ignat; Widell, Kristina Norne; Hafner, Armin; Nordtvedt, Tom Ståle (Chapter, 2022)Dewatering of fish protein hydrolysates is energy intensive process. The freeze concentration is one of the solutions, which provide high quality of concentrate, energy efficiency and sustainability of the hydrolysate ... -
Nullutslippssystemer tilknyttet maritime fartøy innenfor oppdrettsnæringen
Haugum, Samuel Andreas Brøndbo; Lindgaard, Christian Min Flatøy; Martinsen, Marius; Ørstavik, Aksel Engebråten (Bachelor thesis, 2024)Sammendrag Denne rapporten vurderer egnetheten til forskjellige karbonreduserende energisystemer i maritim industri ved hjelp av simulering. Det er først skrevet en innledning med formål om å presentere motivasjonen bak, ... -
Numerical and experimental study of vacuum freezing process
Chrobak, Jakub (Master thesis, 2023)Vakuumfrysing er en alternativ fordampningsmetode for matfrysing. Vanninnholdet i produktet fordamper på grunn av nærvakuumtrykket i kammeret. Frigjøring av latent varmeenergi fra faseendringen forårsaker reduksjon av ... -
Numerical investigation of an ammonia-water absorption-compression high-temperature heat pump for hot water and steam production in food processing
Ren, Shuai; Ahrens, Marcel Ulrich; Hamid, Khalid; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne; Widell, Kristina Marianne Norne (Chapter, 2023)To achieve climate neutrality in the food sector, there is an urgent need for eco-friendly steam boilers. The absorption-compression heat pumps (ACHP) using an ammonia-water mixture as working fluid can provide a high heat ... -
Numerical investigation of an oil-free liquid-injected screw compressor with ammonia-water as refrigerant for high temperature heat pump applications
Ahrens, Marcel Ulrich; Tolstorebrov, Ignat; Tønsberg, Even Kristian; Hafner, Armin; Wang, Ruzhu; Eikevik, Trygve Magne (Peer reviewed; Journal article, 2022)This study investigates a numerical model of an oil-free twin screw compressor with an ammonia-water mixture as refrigerant and liquid injection. The compressor was identified as the main constraint to increase the heat ... -
Ny 22 kV sjøkabel over Sortlandssundet
Blix, Malin Iversen; Norli, Eline Frøysa; Pedersen, Jon Emil (Bachelor thesis, 2024)Med et økende effektbehov i samfunnet er en effektiv og forutsigbar leveranse av elektrisitet viktigere enn noen gang. Eksisterende nettstasjon på Sortland er allerede på 75% av maks kapasitet, og har dermed et behov for ... -
Opportunities for the state-of-the-art production of LIB Electrodes – A review
Bryntesen, Silje Nornes; Strømman, Anders Hammer; Tolstorebrov, Ignat; Shearing, Paul Robert; Lamb, Jacob Joseph; Burheim, Odne Stokke (Peer reviewed; Journal article, 2021)A sustainable shift from internal combustion engine (ICE) vehicles to electric vehicles (EVs) is essential to achieve a considerable reduction in emissions. The production of Li-ion batteries (LIBs) used in EVs is an ... -
Optimized and Cost Efficient Industrial Heat Pumps based on Low Grade Waste Heat
Lund, Robert Hoel (Master thesis, 2016)The industrial sector is a large consumer of energy. Globally, this sector accounts for over half of the energy used. As anthropogenic emissions increase, and the consequences of these emissions become more evident, the ... -
Optimizing design and operation of chilling tank for Atlantic salmon
Widell, Kristina Norne; Nordtvedt, Tom Ståle; Tolstorebrov, Ignat; Fossen, Inge (Chapter, 2019)Farmed salmon is a large export product from Norway. After the salmon is stunned and killed, it is often transported to large tanks for bleeding, chilling and buffering before gutting and further processing. The temperature ... -
Optimizing Low-Temperature Three-Circuit Evaporative Cooling System for an Electric Motor by Using Refrigerants
Konovalov, Dmytro; Tolstorebrov, Ignat; Iwamoto, Yuhiro; Kobalava, Halina; Lamb, Jacob Joseph; Eikevik, Trygve Magne (Journal article; Peer reviewed, 2024)This article presents modeling results and a comprehensive analysis of evaporative cooling systems designed for electric motors using the refrigerants R744 (trans-critical), R134a, R600a, and R290. This study aims to ... -
Performance evaluation of two-stage mechanical vapour recompression with turbo-compressors
Bantle, Michael; Schlemminger, Christian; Tolstorebrov, Ignat; Ahrens, Marcel; Evenmo, Kjetil (Chapter, 2018)Mechanical Vapour Recompression (MVR) is an open loop heat pump system using water (R718) as working fluid, one of the most abundant and safest refrigerant on the planet. The concept can significantly reduce the energy ... -
Physicochemical and functional properties of rainbow trout (Oncorhynchus mykiss) hydrolysate
Kvangarsnes, Kristine; Dauksas, Egidijus; Tolstorebrov, Ignat; Rustad, Turid; Bartolomei, Martina; Xu, Ruoxian; Lammi, Carmen; Cropotova, Janna (Peer reviewed; Journal article, 2023)Due to the continuous growth of the world population, there is an urgent need to find sustainable sources of high-quality protein. Fish side streams rich in essential nutrients and accounting for 60–70% of the whole fish, ... -
Potential for Saccharina latissima Flour as a Functional Ingredient in the Baking Sector
Oprea, Oana Bianca; Tolstorebrov, Ignat; Claussen, Ingrid Camilla; Sannan, Sigurd; Apostol, Livia; Mosoiu, Claudia; Gaceu, Liviu (Journal article; Peer reviewed, 2023)The healthy “superfood” sector is currently quickly developing in Europe, and grocery stores are increasingly stocking macroalgae food supplements. Due to its high amount of protein, fiber, and minerals, numerous studies ... -
Production of fish protein hydrolysates step by step: technological aspects, equipment used, major energy costs and methods of their minimizing
Petrova, Inna; Tolstorebrov, Ignat; Eikevik, Trygve Magne (Journal article; Peer reviewed, 2018)Nowadays, there is a growing interest on how to utilize fish materials remaining from the main production and considered as unappropriated for a direct human consumption. There are numbers of possible solutions to recover ... -
Production Strategies for Sustainable LIB Cathodes with Enhanced Rate Capability and Energy Density
Bryntesen, Silje Nornes (Doctoral theses at NTNU;2023:109, Doctoral thesis, 2023) -
Recent Developments in Cooling Systems and Cooling Management for Electric Motors
Konovalov, Dmytro; Tolstorebrov, Ignat; Eikevik, Trygve Magne; Kobalava, Halina; Radchenko, Mykola; Hafner, Armin; Radchenko, Andrii (Peer reviewed; Journal article, 2023)This study provides an overview of new trends in the development of cooling systems for electric motors. It includes a summary of academic research and patents for cooling systems implemented by leading motor manufacturers ...