Institutt for energi og prosessteknikk
Recent Submissions
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Modeling and simulation of oil-free liquid-injected screw compressors using ammonia-water mixture as working fluid
(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 ... -
The effect of hydrogen enrichment, flame-flame interaction, confinement, and asymmetry on the acoustic response of a model can combustor
(Peer reviewed; Journal article, 2022)To maximise power density practical gas turbine combustion systems have several injectors which can lead to complex interactions between flames. However, our knowledge about the effect of flame-flame interactions on the ... -
Current mapping from the wave spectrum
(Chapter, 2021) -
Improvements in Demand-Controlled Ventilation to Reduce Energy Use and Improve Indoor Air Quality
(Doctoral theses at NTNU;2022:363, Doctoral thesis, 2022)Buildings have become more airtight and insulated over the last years––a response to the acute need to reduce building energy demands in cold climates. However, to secure satisfactory indoor air quality (IAQ) this has led ... -
Global extinction probabilities of terrestrial, freshwater, and marine species groups for use in Life Cycle Assessment
(Peer reviewed; Journal article, 2022)Human activities put pressure on the natural environmental and the Life Cycle Assessment methodology (LCA) is becoming a more prevalent tool to assess the relevant environmental impacts from products and processes on ... -
Climate change mitigation potentials of biofuels produced from perennial crops and natural regrowth on abandoned and degraded cropland in Nordic countries
(Peer reviewed; Journal article, 2022)Bioenergy expansion is present in most climate change mitigation scenarios. The associated large land use changes have led to concerns on how bioenergy can be sustainably deployed. Promising win-win strategies include the ... -
Development of cold thermal energy storage for industrial refrigeration applications
(Doctoral theses at NTNU;2022:387, Doctoral thesis, 2022)Refrigeration technology is a vital part of modern society, covering multiple applications from comfort cooling and process cooling of servers in data centres, to domestic, commercial, and industrial refrigeration systems. ... -
Role of higher education in sustainability of water resources An assessment of institutions in India
(Journal article; Peer reviewed, 2020)The motivation behind this paper is to understand the status of water resources management education provided in higher education institutions (HEIs) in India and decipher gaps between what is taught and what is needed in ... -
Fractal-Like Flow-Fields with Minimum Entropy Production for Polymer Electrolyte Membrane Fuel Cells
(Journal article; Peer reviewed, 2020) -
Simulation of the dipole pattern of summer precipitation over the Tibetan Plateau by CMIP6 models
(Peer reviewed; Journal article, 2021)The dipole pattern of summer precipitation over the Tibetan Plateau (TP) during 1961–2014 is evaluated based on observations and 18 models provided by the Coupled Model Intercomparison Project Phase 6. Of the 18 models, ... -
Negative emission potentials, agronomic and environmental effects of biochar application to agricultural land
(Doctoral theses at NTNU;2022:366, Doctoral thesis, 2022)In 2015 the international community signed the Paris agreement with the aim of maintaining global warming below 2°C. Negative emissions technologies (NETs) that are able of removing atmospheric carbon dioxide for storage ... -
Numerical investigation of an oil-free liquid-injected screw compressor with ammonia-water as refrigerant for high temperature heat pump applications
(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 ... -
Native range estimates for red-listed vascular plants
(Peer reviewed; Journal article, 2022)Besides being central for understanding both global biodiversity patterns and associated anthropogenic impacts, species range maps are currently only available for a small subset of global biodiversity. Here, we provide a ... -
Flow field and performance of a vertical-axis wind turbine on model buildings
(Journal article, 2022)The placement of a scaled-down Savonius (drag) vertical-axis wind turbine on model buildings is analysed experimentally by the use of turbine performance and flow field measurements in a wind tunnel. The set-up consists ... -
A Non-Compact Effective Impedance Model for Can-To-Can Acoustic Communication: Analysis and Optimization of Damping Mechanisms
(Peer reviewed; Journal article, 2021)Can-annular combustors can feature azimuthal instabilities even if the acoustic coupling between the individual cans is weak. Recently, various studies have focused on modeling the acoustic communication between adjacent ... -
Enhancing the efficiency of power- and biomass-to-liquid fuel processes using fuel-assisted solid oxide electrolysis cells
(Journal article; Peer reviewed, 2022)Power- and biomass-to-liquid fuel processes (PBtL) can utilize renewable energy and residual forestry waste to produce liquid synthetic fuels, which have the potential to mitigate the climate impacts of the current ... -
Perturbation theory of nonlinear, non-self-adjoint eigenvalue problems: Semisimple eigenvalues
(Peer reviewed; Journal article, 2021)We discuss high-order adjoint based degenerate perturbation theory of semisimple eigenvalues resulting from nonlinear eigenvalue problems, which are typical of acoustic problems and vibrational analysis. The theory is ... -
Numerical simulation of the airborne transmission of COVID-19 due to respiratory activities under different ventilation conditions.
(Master thesis, 2022)Covid-19 pandemic have recently raised lots of issues about the way we lived socially and have led to various studies for our social behaviour to be adapted to struggle the crisis. This report presents the work done during ... -
Global sensitivity analysis and optimal design of heat recovery ventilation for zero emission buildings
(Peer reviewed; Journal article, 2023)Energy-efficient building services are necessary to realise zero-emission buildings while maintaining adequate indoor environmental quality. As the share of ventilation heating needs grow in well-insulated and airtight ... -
Experimental study on the exposure level of surgical staff to SARS-CoV-2 in operating rooms with mixing ventilation under negative pressure
(Peer reviewed; Journal article, 2022)The purpose of this study was to reveal the exposure level of surgical staff to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from the patient's nose and wound during operations on COVID-19 patients. The ...
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