Browsing Institutt for energi og prosessteknikk by Journals "Energy"
Now showing items 1-20 of 52
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A variation focused cluster analysis strategy to identify typical daily heating load profiles of higher education buildings
(Journal article; Peer reviewed, 2017)This paper presents a variation focused cluster analysis strategy to identify typical daily heating energy usage profiles of higher education buildings. Different from the existing cluster analysis studies which were ... -
Challenges and potentials for low-temperature district heating implementation in Norway
(Journal article; Peer reviewed, 2018)Current district heating (DH) systems with high temperatures are facing many challenges that may decrease its competitiveness. Some of the challenges are decreased heat demands due to energy efficient buildings and high ... -
Combined heat and power dynamic economic dispatch considering field operational characteristics of natural gas combined cycle plants
(Peer reviewed; Journal article, 2021)Combined heat and power dynamic economic dispatch (CHPDED) is one of the key technologies for the efficient operation of natural gas combined cycle (NGCC) plants in integrated energy systems. In this study, based on the ... -
Crossing CO2 equator with the aid of multi-ejector concept: A comprehensive energy and environmental comparative study
(Journal article; Peer reviewed, 2018)The ever-stricter regulations put into effect worldwide to significantly decrease the considerable carbon footprint of commercial refrigeration sector have forced the transition to eco-friendlier working fluids (e.g. CO2, ... -
Dampening of wood batch combustion heat release using a phase change material heat storage: Material selection and heat storage property optimization
(Journal article; Peer reviewed, 2016)The use of wood stoves for space heating in energy effective residential buildings can be problematic due to the batch combustion giving a highly transient heat production and the limited regulation of the combustion ... -
Data informed physical models for district heating grids with distributed heat sources to understand thermal and hydraulic aspects
(Peer reviewed; Journal article, 2021)The aim of the study was to develop data informed physical models for simulation of district heating (DH) grids for better presentation of hydraulic and thermal aspects in the DH grids integrating heat prosumers. A DH grid ... -
Design and simulations of refrigerated sea water chillers with CO2 ejector pumps for marine applications in hot climates
(Journal article; Peer reviewed, 2018)Various system configurations have been developed to improve the R744 systems under hot ambient conditions. However, stationary land applications are characterised by negligible limits on space for system equipment, unlike ... -
Design and simulations of refrigerated sea water chillers with CO2 ejector pumps for marine applications in hot climates
(Journal article; Peer reviewed, 2018)Various system configurations have been developed to improve the R744 systems under hot ambient conditions. However, stationary land applications are characterised by negligible limits on space for system equipment, unlike ... -
Distinguish between the economic optimal and lowest distribution temperatures for heat-prosumer-based district heating systems with short-term thermal energy storage
(Peer reviewed; Journal article, 2022)Decreasing distribution temperature is the key driving force for energy-efficient and economic-competitive district heating (DH) systems, powering the transition from the 1st generation high-temperature steam-based DH ... -
Dynamic modeling of local district heating grids with prosumers: A case study for Norway
(Journal article; Peer reviewed, 2018)District heating (DH) will play an important role in the future fossil-free energy systems by enabling increased utilization of waste heat and renewable heat sources to cover buildings' heat demand. A prerequisite for this ... -
Dynamic modelling of local low-temperature heating grids: A case study for Norway
(Journal article; Peer reviewed, 2017)Today's district heating (DH) networks in Norway are 2nd and 3rd generation systems, with supply temperatures ranging from 80 to 120 °C. In new developments, it is desirable to shift to 4th generation, low-temperature ... -
Dynamic optimization of control setpoints for an integrated heating and cooling system with thermal energy storages
(Journal article; Peer reviewed, 2019)Energy systems for buildings and neighborhoods are expected to become more complex and flexible. Advanced control strategies are required to exploit the full potential of this flexibility and are especially important for ... -
Efficient hydrogen production with CO2 capture using gas switching reforming
(Journal article; Peer reviewed, 2019)Hydrogen is a promising carbon-neutral energy carrier for a future decarbonized energy sector. This work presents process simulation studies of the gas switching reforming (GSR) process for hydrogen production with integrated ... -
Energy planning of district heating for future building stock based on renewable energies and increasing supply flexibility
(Journal article; Peer reviewed, 2016)This paper discusses factors associated with the decisions on energy supply plants in new or existing district heating (DH) systems. Three highly efficient energy conversion technologies were considered. The study focused ... -
Energy, economic, and environmental analysis of integration of thermal energy storage into district heating systems using waste heat from data centres
(Peer reviewed; Journal article, 2021)Data centres produce waste heat, which can be utilized in district heating systems. However, the mismatch between data centres’ heat supply and district heating systems’ heat demands limits its utilization. Further, high ... -
Equation-oriented methods for design optimization and performance analysis of radial inflow turbines
(Peer reviewed; Journal article, 2021)This paper presents methods for design optimization and performance analysis of radial inflow turbines. Both methods are formulated in an equation-oriented manner and involve a single mathematical problem that is solved ... -
Equation-oriented methods for optimizing Rankine cycles using radial inflow turbine
(Peer reviewed; Journal article, 2022)This paper presents methods for optimizing the design and the performance of Rankine cycles using radial inflow turbines. Both methods follow a novel equation-oriented approach and involve a single mathematical problem ... -
Experimental study of the heat transfer problem in expansion devices in CO2 refrigeration systems
(Journal article; Peer reviewed, 2019)Two expansion devices designed for CO2 refrigeration systems namely, capillary tube and fixed-geometry ejector were experimentally tested in the SINTEF/NTNU laboratory in Trondheim, Norway to determine the influence of ... -
Explaining decoupling in high income countries: A structural decomposition analysis of the change in energy footprint from 1970 to 2009
(Peer reviewed; Journal article, 2020)The decoupling of energy use from economic growth is an essential element in the transition to a sustainable future. However, little is known about the long-term drivers of decoupling, especially considering the possibility ... -
Exploring the potential for waste heat recovery during metal casting With thermoelectric generators: On-site experiments and mathematical modelling
(Journal article; Peer reviewed, 2016)Thermoelectric power generators are scalable and simple systems for recovering waste-heat disposed by the industry. We combine on-site measurements and a mathematical model to study the potential for power generation with ...