Browsing NTNU Open by Author "Allouche, Yosr"
Now showing items 1-12 of 12
-
A CFD analysis for the performance assessment of a novel design of plates-in-tank latent storage unit for freezing applications
Selvnes, Håkon; Allouche, Yosr; Sevault, Alexis; Hafner, Armin (Chapter, 2019)In this paper, the charging and discharging processes of a recently developed cold thermal energy storage (CTES) unit integrated into a poultry processing plant is investigated. A mathematical model of the CTES was created ... -
CFD modeling of ice formation and melting in horizontally cooled and heated plates
Selvnes, Håkon; Allouche, Yosr; Sevault, Alexis; Hafner, Armin (Chapter, 2019)This paper investigates the ice formation and melting processes in a novel CTES unit using the commercial CFD software ANSYS Fluent 19. The storage unit is designed to operate as a peak shaving device integrated into the ... -
CFD Modelling for Improved Components in CO2 and Ammonia Vapour Compression Systems
Ringstad, Knut Emil (Doctoral theses at NTNU;2023:180, Doctoral thesis, 2023)Refrigeration and heat-pumping systems are shifting to natural, environmentallyfriendly refrigerants like CO2 to combat global warming. Ejectors are often used in these systems for expansion work recovery to enhance ... -
Cold thermal energy storage for industrial CO refrigeration systems using phase change material: An experimental study
Selvnes, Håkon; Allouche, Yosr; Hafner, Armin; Schlemminger, Christian; Tolstorebrov, Ignat (Journal article, 2022)Refrigeration systems in industrial food processing plants are large users of electric energy and often show high peak power consumption. Cold thermal energy storage (CTES) technology integrated into refrigeration systems ... -
A cold thermal energy storage unit for CO2 refrigeration using phase change material: First experimental results
Selvnes, Håkon; Allouche, Yosr; Hafner, Armin (Chapter, 2021)Refrigeration demands in industrial food processing plants can vary significantly over a week, depending on the production schedules. As a result, it is common to experience peaks of electricity consumption due to the ... -
A detailed review on CO2 two-phase ejector flow modeling
Ringstad, Knut Emil; Allouche, Yosr; Gullo, Paride; Ervik, Åsmund; Banasiak, Krzysztof; Hafner, Armin (Peer reviewed; Journal article, 2020)Ejector-equipped vapor-compression systems for refrigeration and cooling, relying solely on (R744) as a natural working fluid, are perceived to be an eco-friendly and highly efficient solution for many applications. However, ... -
A detailed review on CO2 two-phase ejector flow modeling
Ringstad, Knut Emil; Allouche, Yosr; Gullo, Paride; Ervik, Åsmund; Banasiak, Krzysztof; Hafner, Armin (Peer reviewed; Journal article, 2020)Ejector-equipped vapor-compression systems for refrigeration and cooling, relying solely on (R744) as a natural working fluid, are perceived to be an eco-friendly and highly efficient solution for many applications. However, ... -
Development of cold thermal energy storage for industrial refrigeration applications
Selvnes, Håkon (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. ... -
Experimental and numerical investigation of a transcritical CO2 air/water reversible heat pump: analysis of domestic hot water production
Tosato, Giacomo; Artuso, Paolo; Minetto, Silvia; Rossetti, Antonio; Allouche, Yosr; Banasiak, Krzysztof (Chapter, 2020)As a natural refrigerant, carbon dioxide is safe, economic and environmentally sustainable and can be successfully utilized in heat pump and refrigeration systems operating according to transcritical cycles. This paper ... -
Experimental characterisation of a cold thermal energy storage unit with a pillow-plate heat exchanger design
Selvnes, Håkon; Allouche, Yosr; Hafner, Armin (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. ... -
Review on cold thermal energy storage applied to refrigeration systems using phase change materials
Selvnes, Håkon; Allouche, Yosr; Manescu, Raluca Iolanda; Hafner, Armin (Peer reviewed; Journal article, 2021)This paper presents a thorough review on the recent developments and latest research studies on cold thermal energy storage (CTES) using phase change materials (PCM) applied to refrigeration systems. The presented study ... -
Ultra-Low-Temperature Refrigeration Systems: A Review and Performance Comparison of Refrigerants and Configurations
Saeed, Muhammad Zahid; Contiero, Luca; Blust, Stefanie; Allouche, Yosr; Hafner, Armin; Eikevik, Trygve Magne (Peer reviewed; Journal article, 2023)During the last decade, many industrial and medical applications have shown a requirement for low-temperature-cooling usage (from −40 to −80 °C), which cannot be efficiently obtained via the conventional refrigeration ...