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Thermo-Mechanical Exergy of a Substance Below Environmental Pressure
(Journal article; Peer reviewed, 2024)In this work, we demonstrate why classical thermo-mechanical exergy functions are incorrect below the environmental reference pressure, since they result in too small or even negative values. We present new derivations for ... -
Thermo-physical properties of anisotropic materials - A comparison between experiments and numerical calculations
(Master thesis, 2014)Hydrogen has the potential to become a replacement for fossil energy carriers in the future. Thermophysical properties like thermal conductivity and specific heat will be very important when determining the internal heat ... -
Thermoacoustic modes of intrinsic and acoustic origin and their interplay with exceptional points
(Peer reviewed; Journal article, 2020)We propose a general classification of all the modes of a given thermoacoustic system into two sets: one of acoustic origin and one of intrinsic thermoacoustic (ITA) origin. To do this, the definition of intrinsic modes, ... -
Thermoacoustic oscillations in a can-annular model combustor with asymmetries in the can-to-can coupling
(Peer reviewed; Journal article, 2022)Can-annular combustors are equipped with a set of nominally identical cans, circumferentially arranged around the shaft. Adjacent cans are coupled acoustically via a small gap at the downstream end, where the circular ... -
Thermocapillary instability as a mechanism for film boiling collapse
(Journal article; Peer reviewed, 2018)We construct a model to investigate the interfacial stability of film boiling, and discover that instability of very thin vapour films and subsequent large interface superheating is only possible if thermocapillary ... -
Thermodynamic analysis of CO2 capture processes for power plants
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:217, Doctoral thesis, 2014)This thesis work presents an evaluation of various processes for reducing CO2 emissions from natural-gas-fired combined cycle (NGCC) power plants. The scope of the thesis is to focus mainly on post-combustion chemical ... -
Thermodynamic analysis of different methanation reactors for biogas upgrading
(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 analysis of rotary pressure exchanger and ejectors for CO2 refrigeration system
(Journal article; Peer reviewed, 2024)Natural refrigerant CO2 has become a viable choice for refrigeration units for land-based and offshore applications due to its environment-friendly nature and compactness. The CO2 transcritical cycle allows operating in ... -
Thermodynamic aspects of of entropic cosmology with viscosity
(Peer reviewed; Journal article, 2021)We describe the evolution of the early and late universe from thermodynamic considerations, using the generalized nonextensive Tsallis entropy with a variable exponent. A new element in our analysis is the inclusion of a ... -
Thermodynamic Behaviour and Heat Transfer in Closed Surge Tanks for Hydropower Plants
(Journal article; Peer reviewed, 2015)A numerical model of a hydraulic system with a closed surge tank is developed for evaluating the thermodynamic behavior during slow transients in the air pocket. The numerical model is used to evaluate the polytrophic ... -
Thermodynamic Insight in Design of Methanation Reactor with Water Removal Considering Nexus between CO2 Conversion and Irreversibilities
(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 ... -
Thermodynamic Modeling of a Novel Multi-vane Compressor for Industrial Heat Pumps
(Master thesis, 2022)Abstract will be available on 2025-05-21 -
Thermodynamic modeling of a water injected twin screw compressor used in high temperature heat pump range
(Master thesis, 2020)Det anslås at høytemperaturs varmepumper skal være en vesentlig del av en grønn industrisektor i fremtiden (IEA, 2020). Hovedutfordringen for høytemperaturs varmpepumper er å finne pålitelige og effektive kompressorer som ... -
Thermodynamic modeling with equations of state: present challenges with established methods
(Journal article; Peer reviewed, 2017)Equations of state (EoS) are essential in the modeling of a wide range of industrial and natural processes. Desired qualities of EoS are accuracy, consistency, computational speed, robustness and predictive ability outside ... -
Thermodynamic models to accurately describe the PVTxy-behavior of water / carbon dioxide mixtures
(Journal article; Peer reviewed, 2017)Carbon dioxide/water (CO2/H2O) mixtures are of much interest in carbon capture and storage, atmospheric science, in the description of human lungs and in the processing of food and beverages. We present a comprehensive ... -
Thermodynamic performance indicators in offshore oil and gas processes
(Master thesis, 2021)With the environmental awareness increasing in recent decades and the imminent prospect of carbon neutrality more attention has been paid to the ways in which the greenhouse gas emissions and the energy demand of industrial ... -
Thermodynamic Performance Investigation of Commercial R744 Booster Refrigeration Plants Based on Advanced Exergy Analysis
(Journal article; Peer reviewed, 2019)After the recent renewed interest in CO2 as the refrigerant (R744) for the food retail industry, many researchers have focused on the performance enhancement of the basic transcritical R744 supermarket refrigeration unit ... -
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 ... -
Thermophoresis and its effect on particle impaction on a cylinder for low and moderate Reynolds numbers
(Peer reviewed; Journal article, 2021)The effect of thermophoresis on the impaction of particles on a cylinder is investigated for different particle sizes, particle conductivities, temperature gradients and for Reynolds numbers between 100 and 1600. This is ... -
Thin-layer modeling in heat pump drying of green peas
(Master thesis, 2015)The current drying of heat sensitive materials is mostly done by conventional vacuum freeze drying. The major challenges are a long residence time, a low drying capacity and high energy use. An innovative drying process ...