Institutt for energi og prosessteknikk
Recent Submissions
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Computational analysis of premixed methane-air flame interacting with a solid wall or a hydrogen porous wall
(Peer reviewed; Journal article, 2020)The process of flame-wall interaction for premixed methane-air flames is investigated by direct numerical simulation. The flames propagate towards an isothermal, chemically inert surface, consisting of either a solid ... -
Improving the Recovery of Critical Metals from End-of-Life Vehicles
(Doctoral theses at NTNU;2020:90, Doctoral thesis, 2020)Car electronics form an extensive yet untapped source for secondary critical raw mate-rials. The complexity and time variability of car electronics pose a challenge for esti-mating the potentials for recycling and for ... -
ANN modelling of CO2 refrigerant cooling system COP in a smart warehouse
(Peer reviewed; Journal article, 2020)Industrial cooling systems consume large quantities of energy with highly variable power demand. To reduce environmental impact and overall energy consumption, and to stabilize the power requirements, it is recommended to ... -
Computational fluid dynamic simulations of thermochemical conversion of pulverized biomass in a dilute flow using spheroidal approximation
(Peer reviewed; Journal article, 2020)A drag force model for spheroids, referred as the spheroid model, was implemented in OpenFOAM, in order to better predict the thermochemical conversion of pulverized biomass. Our previous work has found that the spheroid ... -
Thermodynamic properties of the 3D Lennard-Jones/spline model
(Peer reviewed; Journal article, 2019)In the Lennard-Jones spline (LJ/s) model, the Lennard-Jones (LJ) potential is truncated and splined so that both the pair potential and the force continuously approach zero at rc ≈ 1.74σ. It exhibits the same structural ... -
Data-driven modeling of a CO2 refrigeration system
(Peer reviewed; Journal article, 2019)This paper describes a data-driven method for system identification of a CO 2 refrigeration system. Traditionally, the interaction between the measured variables is not utilized as they are highly dependent on the refrigeration ... -
A study of citywide urban residential energy information system for the building energy efficiency management: a cluster model of seven typical cities in China
(Peer reviewed; Journal article, 2019)he lack of empirical data demonstrating the relationship between influencing factors and building energy performance is one of the primary barriers in energy efficiency management. A citywide residential energy information ... -
Predictive rule-based control to activate the energy flexibility of Norwegian residential buildings: Case of an air-source heat pump and direct electric heating
(Peer reviewed; Journal article, 2019)The building energy flexibility potential of a Norwegian single-family detached house is investigated using predictive rule-based control (PRBC) and building performance simulation (using IDA ICE). Norwegian timber buildings ... -
A study of citywide urban residential energy information system for the building energy efficiency management: a cluster model of seven typical cities in China
(Peer reviewed; Journal article, 2019)he lack of empirical data demonstrating the relationship between influencing factors and building energy performance is one of the primary barriers in energy efficiency management. A citywide residential energy information ... -
Optical Study of Soot Characteristics of Biofuel Spray Combustion
(Doctoral theses at NTNU;2020:117, Doctoral thesis, 2020)Liquid biofuels for internal combustion engines will likely be part of the future solution for mitigating CO2 emissions to the atmosphere. Several types of biofuels for compression ignition (CI) engines are being developed ... -
A comprehensive review of verification and validation techniques applied to hydraulic turbines
(Peer reviewed; Journal article, 2019)The paper critically reviews the verification and validation (VV) techniques applied to investigate hydraulic turbines. Although there are well-established standards such as AIAA G-077-1998 and ERCOFTAC guide for turbulence ... -
On particle transport and turbulence in wellbore flows of non-Newtonian fluids - Findings from a cuttings transport process analysis by means of computational fluid dynamics, rheometry, and dimensional analysis
(Doctoral theses at NTNU;2020:95, Doctoral thesis, 2020)Cuttings transport modeling was analyzed with a major focus on three dimensional (3D) Computational Fluid Dynamics (CFD) approaches including rheometry and to a lesser extent on one-dimensional modeling and dimensional ... -
Taking the Motion out of Floating Lidar: Turbulence Intensity Estimates with a Continuous-Wave Wind Lidar
(Peer reviewed; Journal article, 2020)Due to their motion, floating wind lidars overestimate turbulence intensity ( TI ) compared to fixed lidars. We show how the motion of a floating continuous-wave velocity–azimuth display (VAD) scanning lidar in all six ... -
Large-scale monitoring of operationally diverse district heating substations: A reference-group based approach
(Peer reviewed; Journal article, 2020)A typical district heating (DH) network consists of hundreds, sometimes thousands, of substations. In the absence of a well-understood prior model or data labels about a substation, the overall monitoring of such large ... -
Optimal control of flexible natural gas combined cycles with stress monitoring: Linear vs nonlinear model predictive control
(Peer reviewed; Journal article, 2020)In future energy markets, traditional thermal power plants are expected to cycle more to adapt their operation to the intermittent power generation of renewable energy sources. Gas turbine load ramps and stresses in ... -
Recovery of cold energy from liquefied natural gas regasification: Applications beyond power cycles
(Peer reviewed; Journal article, 2018)Liquefied natural gas releases large amounts of cold energy during the conventional regasification process. Currently, most studies have investigated the opportunities to utilize this waste cold for power cycles but few ... -
Process design and economic optimization of boil-off-gas re-liquefaction systems for LNG carriers
(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
(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) ... -
Process optimization and working fluid mixture design for organic Rankine cycles (ORCs) recovering compression heat in oxy-combustion power plants
(Peer reviewed; Journal article, 2018)In this study, an Organic Rankine Cycle (ORC) is proposed to be integrated with the flue gas pre-compression process to reduce the energy cost resulting from Carbon Capture and Storage (CCS). An equation-based flowsheet ... -
Optimal Use of Liquefied Natural Gas (LNG) Cold Energy in Air Separation Units
(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. ...
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