Blar i Publikasjoner fra CRIStin - SINTEF Energi på tidsskrift "International journal of refrigeration"
Viser treff 1-15 av 15
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A steady and quasi-steady state analysis on the CO2 hybrid ground-coupled heat pumping system
(Journal article; Peer reviewed, 2017)This article contains the steady and quasi-steady state analysis on a CO2 hybrid ground-coupled heat pumping system for warm climates. The hybrid system uses a combination of ambient air and ground boreholes as a heat sink ... -
Application range of the HEM approach for CO2 expansion inside two-phase ejectors for supermarket refrigeration systems
(Peer reviewed; Journal article, 2015)In this study, the accuracy of the homogeneous equilibrium (HEM) applied to 3-D CFD-based simulations of CO2 expansion inside two-phase ejectors is presented. The HEM approach previously reported in the literature were ... -
Development and performance mapping of a multi-ejector expansion work recovery pack for R744 vapour compression units
(Peer reviewed; Journal article, 2015)A multi-ejector expansion pack, intended as a substitute for a standard high-pressure electronic expansion valve (HPV), was designed, manufactured and experimentally investigated. Four different ejector cartridges were ... -
Experimental and computational analysis of a R744 flashing ejector
(Journal article; Peer reviewed, 2019) -
Modified homogeneous relaxation model for the r744 trans-critical flow in a two-phase ejector
(Journal article; Peer reviewed, 2017) -
Non-equilibrium approach for the simulation of CO2 expansion in two-phase ejector driven by subcritical motive pressure
(Peer reviewed; Journal article, 2020)A non-equilibrium approach was proposed for highly accurate modelling of the expansion process during two-phase flow in the convergent-divergent motive nozzle of an R744 ejector. Comprehensive mapping of the coefficients ... -
A novel R744 multi-temperature cycle for refrigerated transport applications with low-temperature ejector: Experimental ejector characterization and thermodynamic cycle assessment
(Peer reviewed; Journal article, 2023)A novel vapor-compression system concept employing carbon dioxide as the refrigerant is proposed to serve the needs of a typical medium-size refrigerated truck used for multi-temperature (MT and LT) goods delivery. The ... -
Overview of the development and status of carbon dioxide (R-744) refrigeration systems onboard fishing vessels
(Peer reviewed; Journal article, 2022)Globally, most fishing vessels still use the ozone-depleting and climate-harmful R-22 in their freezing and refrigerated seawater (RSW) systems. However, in some regions, the natural refrigerant ammonia is the preferred ... -
Performance improvement of the R744 two-phase ejector With a implemented suction nozzle bypass
(Journal article; Peer reviewed, 2018)In this study, the concept of an R744 ejector with a bypass duct of a suction nozzle was presented. The design of the geometry and bypass positioning in a mixing section, and the idea of regulation, as well as integration, ... -
Performance operation of liquid ejectors for a R744 integrated multi-ejector supermarket system using a hybrid ROM
(Peer reviewed; Journal article, 2019)Performance maps were generated for designed liquid ejectors installed in a multi-ejector module in an R744 integrated supermarket system using a hybrid of the reduced-order model (ROM). Hybrid ROMs of the investigated ... -
Review of Vapour Compression Heat Pumps for High Temperature Heating using Natural Working Fluids
(Journal article; Peer reviewed, 2017)The use of high temperature heat pumps (HTHPs) operating with natural fluids has been shown to be a potential environmentally friendly solution to increase energy efficiency in industrial processes. Industrial processes ... -
Shape optimisation of a two-phase ejector for CO2 refrigeration systems
(Journal article; Peer reviewed, 2016)The shape optimisation of four CO2 ejectors is presented in this study. The considered ejectors were originally designed for a multi-ejector supermarket CO2 refrigeration system. The objective function was formulated to ... -
Techno-economic analyses of CO2 liquefaction: Impact of product pressure and impurities
(Journal article; Peer reviewed, 2019)As a first step towards identifying the optimal transport conditions for shipping CO2, this study investigates the impact of post-liquefaction delivery pressure on the design and cost of CO2 liquefaction for (a) pure CO2 ... -
The influence of long-term storage, temperature and type of packaging materials on the quality characteristics of frozen farmed Atlantic Salmon (Salmo Salar)
(Journal article; Peer reviewed, 2014)The variations of biochemical, structural, sensory and microbiological characteristics of salmon were examined during the long-term frozen storage at –25 °C, –45 °C and –60 °C. The effects of four different types of packaging ... -
Transcritical R744 refrigeration systems for supermarket applications: Current status and future perspectives
(Journal article; Peer reviewed, 2018)Visible signs of climate change call for urgent actions on food retail industry, since such a sector is characterized by an abundant carbon footprint. Being CO2 (or R744) recognised across the world as the most promising ...