Blar i Institutt for energi og prosessteknikk på tidsskrift "Energies"
Viser treff 41-60 av 75
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Investigation of Thermopressor with Incomplete Evaporation for Gas Turbine Intercooling Systems
(Peer reviewed; Journal article, 2023)One of the promising ways to increase fuel and modern gas turbine energy efficiency is using cyclic air intercooling between the stages of high- and low-pressure compressors. For intercooling, it is possible to use cooling ... -
Investigations of Rake and Rib Structures in Sand Traps to Prevent Sediment Transport in Hydropower Plants
(Journal article; Peer reviewed, 2021)In order to increase the lifespan of hydraulic turbines in hydropower plants, it is necessary to minimize damages caused by sediment erosion. One solution is to reduce the amount of sediments by improving the design of ... -
Is It Possible to Supply Norwegian Apartment Blocks with 4th Generation District Heating?
(Journal article; Peer reviewed, 2019)Direct electricity is widely used for heating purposes in Norway, leading to significant strain on the electricity grid during the heating season. Conversion to 4th generation district heating (4GDH) is an effective method ... -
Leakage Vortex Progression through a Guide Vane’s Clearance Gap and the Resulting Pressure Fluctuation in a Francis Turbine
(Peer reviewed; Journal article, 2021)A clearance gap (CG) between guide vanes (GVs) and facing plates exists at both ends of a Francis turbine and allows the opening angle to be adjusted for varying operating conditions. Leakage flow is induced through this ... -
Lessons learned from an experimental campaign on promoting energy content of renewable biogas by injecting H2 during anaerobic digestion
(Peer reviewed; Journal article, 2020)Direct injection of H2 to an anaerobic reactor enables biological fixation of CO2 into CH4 (biomethanation) and consequently boosts methane content in the produced biogas. However, there has been only a small amount of ... -
Life Cycle Based Climate Emissions of Charcoal Conditioning Routes for the Use in the Ferro-Alloy Production
(Peer reviewed; Journal article, 2022)Renewable reductants are intended to significantly reduce CO2 emissions from ferro-alloy production, e.g., by up to 80% in 2050 in Norway. However, charcoals provide inferior properties compared to fossil fuel-based ... -
Lifetime Assessment of Combined Cycles for Cogeneration of Power and Heat in Offshore Oil and Gas Installations
(Journal article; Peer reviewed, 2017)The utilization of combined cycles for offshore cogeneration of power and heat is an attractive option to reduce the CO2 emissions directly related to the oil and gas sector. Main challenges for their efficient implementation ... -
Lithium-Ion Capacitors: A Review of Design and Active Materials
(Peer reviewed; Journal article, 2021)Lithium-ion capacitors (LICs) have gained significant attention in recent years for their increased energy density without altering their power density. LICs achieve higher capacitance than traditional supercapacitors due ... -
Local Heating Networks with Waste Heat Utilization: Low or Medium Temperature Supply?
(Peer reviewed; Journal article, 2020)District heating enables an economical use of energy sources that would otherwise be wasted to cover the heating demands of buildings in urban areas. For efficient utilization of local waste heat and renewable heat sources, ... -
Measuring the dynamic characteristics of a low specific speed pump-Turbine model
(Journal article; Peer reviewed, 2016)This paper presents results from an experiment performed to obtain the dynamic characteristics of a reversible pump-turbine model. The characteristics were measured in an open loop system where the turbine initially was ... -
Modeling of a CO2‐Based Integrated Refrigeration System for Supermarkets
(Peer reviewed; Journal article, 2021)An integrated energy system that consists of a centralized refrigeration unit can deliver the entire HVAC&R (heating, ventilation, air conditioning, and refrigeration) demand for a supermarket. CO2 (R744) is a natural ... -
Multi-Ejector Concept: A Comprehensive Review on its Latest Technological Developments
(Journal article; Peer reviewed, 2019)The adoption of the EU F-Gas Regulation 517/2014 and the resulting development of the multi-ejector concept have led carbon dioxide to take center stage as the sole refrigerant (R744) in several applications. Therefore, a ... -
New Renewable Hydrothermal Liquefaction (HTL) Biofuel: A Combustion and Emissions Study in an Optical Engine
(Journal article; Peer reviewed, 2023)This study involves the investigation of municipal solid waste (MSW) based biofuel in order to demonstrate its utilization as a diesel blendstock in a compression ignition (CI) engine. The biofuel was produced from the ... -
Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers
(Peer reviewed; Journal article, 2021)Required refrigerant charge in heat pump systems with propane is analyzed. Two systems are compared: The first a direct heat pump, with fin-and-tube heat exchangers, and the second an indirect system, with plate heat ... -
Opportunities for the state-of-the-art production of LIB Electrodes – A review
(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 ... -
The Performance Analysis of an Integrated CO2 Refrigeration System with Multi-Ejectors Installed in a Supermarket
(Peer reviewed; Journal article, 2022)The field data from an integrated CO2 refrigeration system installed in a supermarket located north of the capital of Lisbon was analyzed. The goal was to demonstrate the effect and performance of multi-ejectors on a ... -
Platinum and Platinum Group Metal-Free Catalysts for Anion Exchange Membrane Fuel Cells
(Journal article; Peer reviewed, 2020)The development of active hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) catalysts for use in anion exchange membrane fuel cells (AEMFCs), which are free from platinum group metals (PGMs), is expected ... -
Predicting Silica Deposition from Superheated, Pressurized Steam Using Numerical Modeling of Nucleation, Agglomeration and Deposition
(Peer reviewed; Journal article, 2023)A model that can be used to quantify silica deposition from superheated depressurized steam is developed. Classical nucleation theory, agglomeration and deposition onto a wall are combined in a numerical model that calculates ... -
Production of Sustainable Aviation Fuels from Lignocellulosic Residues in Brazil through Hydrothermal Liquefaction: Techno-Economic and Environmental Assessments
(Peer reviewed; Journal article, 2023)Decarbonization of the aviation sector relies on deployment of sustainable aviation fuels (SAF) at commercial scale. Hydrothermal liquefaction (HTL) has been recognized as a promising technology to help supply the increasing ... -
Recent Developments in Cooling Systems and Cooling Management for Electric Motors
(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 ...