Blar i Institutt for energi og prosessteknikk på tidsskrift "Renewable Energy"
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Energy cost models for air supported sports hall in cold climates considering energy efficiency
(Journal article; Peer reviewed, 2015)The aim of the study was to develop models for energy planning for an air supported sports hall by analyzing different energy efficiency possibilities. This is a very specific building type suitable for sport activities ... -
Experimental study of a Francis turbine under variable-speed and discharge conditions
(Journal article; Peer reviewed, 2018)This work investigates the unsteady pressure fluctuations in a hydraulic turbine that are observed during steep ramping. Although hydraulic turbines are expected to operate seamlessly during steep ramping, the resulting ... -
Identifying key design parameters of the integrated energy system for a residential Zero Emission Building in Norway
(Journal article; Peer reviewed, 2016)This study examined an integrated solution of the building energy supply system consisting of flat plate solar thermal collectors in combination with a ground-source heat pump and an exhaust air heat pump for the heating ... -
Investigation of a Francis turbine during speed variation: Inception of cavitation
(Peer reviewed; Journal article, 2020)Variable-speed operation of a hydro turbine is considered as an alternative option to meet fluctuating energy demand as it allows high-ramping rate. Cavitation can be a limiting factor to utilize the variable-speed technology ... -
An investigation of using CO<inf>2</inf> heat pumps to charge PCM storage tank for domestic use
(Journal article; Peer reviewed, 2023)Current investigations mainly focused on onefold phase change material (PCM) storage tank charging process, while the integration between a heat-source device and a PCM storage tank has been seldom considered. The investigation ... -
Investigations of unsteady pressure loading in a Francis turbine during variable-speed operation
(Journal article; Peer reviewed, 2017)Current study was aimed to investigate the unsteady pressure loading in a model Francis turbine under variable-speed configurations. Focus was to investigate the time-dependent characteristic frequencies and the pressure ... -
Natural heat transfer air-conditioning terminal device and its system configuration for ultra-low energy buildings
(Peer reviewed; Journal article, 2020)In consideration of the lowered heating and cooling load of ultra-low energy buildings, a natural heat transfer air-conditioning terminal device (NHTACTD) is presented by the authors. The terminal device is able to undertake ... -
Optimal combination of bioenergy and solar photovoltaic for renewable energy production on abandoned cropland
(Peer reviewed; Journal article, 2021)Ambitious climate change mitigation scenarios require large-scale deployment of bioenergy and solar photovoltaics. Utilizing recently abandoned cropland for renewable energy production is a promising option for energy ... -
Review on numerical techniques applied in impulse hydro turbines
(Peer reviewed; Journal article, 2020)Impulse turbines are widely used in hydropower plants around the world due to their high efficiency in a larger operating range compared to reaction turbines. State of the art Pelton turbines can give over 90% efficiency ... -
Techno-economic optimization of open-air swimming pool heating system with PCM storage tank for winter applications
(Peer reviewed; Journal article, 2020)Feasible heating systems have been designed to increase the availability of open-air swimming pools in winter in subtropical climate regions. However, the approach to optimally size the main components of the system from ... -
The near-field of a lab-scale wind turbine in tailored turbulent shear flows
(Journal article; Peer reviewed, 2020)Real wind turbines experience a wide range of turbulent shear flows that naturally occur within the atmospheric boundary layer, however, these are often difficult to simulate in experiments. An active grid was used to ...