Browsing Institutt for energi og prosessteknikk by Journals "Applied Thermal Engineering"
Now showing items 1-20 of 29
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A novel methodology for Rankine cycle analysis with generic heat exchanger models
(Journal article; Peer reviewed, 2019)This study presents a novel approach for Rankine cycle (RC) analysis, introducing a generic counter current heat exchanger (HX) model to enable basic fluid thermal and flow behaviour in HXs to be considered in a cycle ... -
A validated CFD model of plain and serrated fin-tube bundles
(Journal article; Peer reviewed, 2018)This work presents a Computational Fluid Dynamics model of helically wound fin tube bundles and demonstrates its predictive capability for thermal-hydraulic performance. A consistent validation against experimental data ... -
Analysis of an integrated heating and cooling system for a building complex with focus on long–term thermal storage
(Journal article; Peer reviewed, 2018)Modern building complexes have simultaneous heating and cooling demands. Therefore, integrated energy systems with heat pumps and long-term thermal storage are a promising solution. An integrated heating and cooling system ... -
Annual energy performance of R744 and R410A heat pumping systems
(Journal article; Peer reviewed, 2017)This work compares the annual energy performance of heat pumping systems using R744 and R410A as refrigerant. Focus is the annual energy efficiency of R744 hybrid ground-coupled heat pumping system. The hybrid system uses ... -
CFD modelling of R410A flow through an expansion valve using equilibrium and modified relaxation models
(Peer reviewed; Journal article, 2021)The two-phase flow of R410A refrigerant through an electronic expansion valve (EEV) is modelled using two models, the Homogeneous Equilibrium Model (HEM) and Homogeneous Relaxation Model (HRM) in a CFD numerical analysis. ... -
Characteristics of evaporation of propane (R290) in compact smooth and microfinned tubes
(Peer reviewed; Journal article, 2020)Evaporation of flowing propane and the effect of enhanced geometry on heat transfer coefficient and pressure drop is experimentally investigated. One smooth tube and two microfinned tubes with an outer diameter of 5 mm ... -
Compact steam bottoming cycles: model validation with plant data and evaluation of control strategies for fast load changes
(Journal article; Peer reviewed, 2018)Power plants installed on offshore oil and gas installations need to be operated in a flexible manner in order to accommodate the variability in heat and power demands. The present paper describes steady-state process model ... -
Comparative analysis of evaporation of isobutane (R600a) and propylene (R1270) in compact smooth and microfinned tubes
(Peer reviewed; Journal article, 2021)Data base for evaporation of flowing isobutane and propylene in compact internally enhanced surfaces is extended by experimental tests in two microfinned tubes and a smooth tube. The outer diameter for all of the test tubes ... -
Design and off-design simulations of combined cycles for offshore oil and gas installations
(Journal article; Peer reviewed, 2013)Combined cycles applied on offshore oil and gas installations could be an attractive technology on the Norwegian continental shelf to decrease costs related to CO2 emissions. Current power plant technology prevailing on ... -
Dynamic modelling and simulation of the Graz Cycle for a renewable energy system
(Peer reviewed; Journal article, 2024)Critical atmospheric carbon dioxide levels and, in response, an increasing shift toward variable renewable energy sources causes the need of transient operation for thermal power plants coupled with carbon capture and ... -
Evaluation of a New System Combining Wood-Burning Stove, Flue Gas Heat Exchanger and Mechanical Ventilation with Heat Recovery in Highly-Insulated Houses
(Journal article; Peer reviewed, 2019)The performance of an innovative flue gas heat exchanger (FGHE) located at the exit of a wood-burning stove (log or pellet) to pre-heat ventilation air has been assessed for highly insulated detached houses. For this ... -
Experimental and numerical study on the R744 ejector with a suction nozzle bypass
(Peer reviewed; Journal article, 2021)State-of-the-art R744 cooling cycles include highly efficient ejectors as a crucial element for competitive energy consumption in warm climates. However, an improvement is still possible, as shown in this study. This study ... -
Experimental characterisation of a cold thermal energy storage unit with a pillow-plate heat exchanger design
(Peer reviewed; Journal article, 2021)Cold Thermal Energy Storage (CTES) technology can be introduced to refrigeration systems for air conditioning and process cooling to reduce the peak power consumption by decoupling the supply and demand of refrigeration. ... -
HEM and HRM accuracy comparison for the simulation of CO2 expansion in two-phase ejectors for supermarket refrigeration systems
(Journal article; Peer reviewed, 2017)In this study, the accuracies of the homogeneous equilibrium (HEM) and homogeneous relaxation models (HRM) were compared. Both models were implemented in the ejectorPL computational tool. The HEM and HRM were used to ... -
An improved combined heat and power economic dispatch model for natural gas combined cycle power plants
(Peer reviewed; Journal article, 2020)An increasing number of natural gas combined cycle (NGCC) plants are operated under combined heat and power mode. Therefore, a combined heat and power economic dispatch (CHPED) is the key to achieve the optimal utilization ... -
Integrated high temperature heat pumps and thermal storage tanks for combined heating and cooling in the industry
(Peer reviewed; Journal article, 2021)This study investigates the integrated heat pump system of a green-field dairy located in Bergen, Norway. The purpose of the study is to determine the energy consumption and system performance. The dairy features a novel ... -
Machine learning and CFD for mapping and optimization of CO2 ejectors
(Peer reviewed; Journal article, 2021)In this study, a novel simulation-based algorithm for CO2 ejector design and performance evaluation is presented. The algorithm is based on an automated Computational Fluid Dynamics (CFD) workflow that can account for ... -
Multiejector CO2 cooling system with evaporative gascooler for a supermarket application in tropical regions
(Peer reviewed; Journal article, 2021)In the present study, the performance of a 33 kW multiejector trans-critical CO2 cooling system is experimentally evaluated for a supermarket application with/without internal heat exchanger and evaporative cooling. In ... -
Novel integrated CO2 vapour compression racks for supermarkets. Thermodynamic analysis of possible system configurations and influence of operational conditions
(Journal article; Peer reviewed, 2017)An increasing number of supermarket chains are opting for the utilisation of centralised carbon dioxide refrigeration systems. However, the need to improve their efficiency in order to make them economically and environmentally ... -
Numerical investigation of a CO2 cooling system connected to Spawn-of-energy-plus thermal zones
(Peer reviewed; Journal article, 2022)Today, only about 25 % of the European building stock is considered energy efficient. Meanwhile, the implementation of CO2 as a refrigerant is considered one of the solutions to improve the overall building’s energy ...