Browsing NTNU Open by Author "Selvnes, Håkon"
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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 ... -
Advanced R744 solution for supermarkets, hotel chillers and maritime applications in India
Singh, Simarpreet; Selvnes, Håkon; Pardiñas, Ángel Á.; Reddy, Srinevas K; Gupta, P; Vaishak, S; Arun, B.S.; Widell, Kristina Norne; Elarga, Hagar; Hafner, Armin (Chapter, 2022)R744 integrated systems can meet oscillating heating and cooling demands efficiently and become a game changer in countries such as India. The present work aims to develop and present R744 system designs and disseminate ... -
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 ... -
Cold thermal energy storage for air conditioning in a supermarket CO2 booster refrigeration system
Selvnes, Håkon; Alvarez Pardinas, Angel; Hafner, Armin (Chapter, 2023)Integrated supermarket refrigeration systems are based on transcritical CO2 booster systems, supplying cooling and freezing of the products in the store and air conditioning (AC) of the shop area by cooling a glycol circuit ... -
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 ... -
Cold thermal energy storage in solid-liquid transition of carbon dioxide: Investigating the possibility
Mastani Joybari, Mahmood; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin (Chapter, 2022)Industrial freezing is an energy-intensive process which is growing due to the increasing demand. This is exerting stress on electrical grids, especially at peak hours. To tackle this issue, thermal energy storage has ... -
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 ... -
Cold thermal storage integration in a large industrial refrigeration system
Selvnes, Håkon; Hafner, Armin; Kauko, Hanne (Chapter, 2018)Global warming is one of the greatest challenges our society faces today, and researchers strive to find solutions to reduce the emissions of greenhouse gases that accelerate the global warming effect. This paper describes ... -
Design of a cold thermal energy storage unit for industrial applications using CO2 as refrigerant
Selvnes, Håkon; Hafner, Armin; Kauko, Hanne (Chapter, 2019)Natural refrigerants such as ammonia, hydrocarbons and CO2 are becoming increasingly popular due to favorable thermo-physical properties, low environmental impact and low cost. Industrial refrigeration systems are often ... -
Development of a fossil-free heating system for chicken barns based on heat pumps and thermal storage
Thapa, Saroj (Master thesis, 2023)Mens det globale forbruket av fjørfekjøtt fortsetter sin oppadgående trend, rettes det uunngåelige søkelyset mot den betydelige miljøpåvirkningen, spesielt de betydelige CO2-utslippene knyttet til konsum av kyllingkjøtt. ... -
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. ... -
Ejector for the world: simplified ejector-supported CO2 refrigeration systems for all climates
Pardiñas, Ángel Á.; Fabris, F; Contiero, Luca; Selvnes, Håkon; Banasiak, Krzysztof; Hafner, Armin (Chapter, 2022)The novel configuration presented in this work simplifies the layout of ejector-supported booster systems while maintaining all the benefits of an ejector implementation. The basic version of the solution is based on: i) ... -
Energy distribution concepts for Urban Supermarkets including energy hubs
Selvnes, Håkon; Hafner, Armin (Chapter, 2018)An increasing share of the population on earth is living in urban areas. Using urban building plots for combined purposes will be important in the future. Investors are interested in building new building concepts that ... -
Energy distribution concepts for Urban Supermarkets including energy hubs
Selvnes, Håkon (Master thesis, 2017)More and more of the earths population is living in urban areas. This indicates that using urban building plots for combined purposes will be important in the future. For this reason supermarket chains are developing new ... -
Energy flow analysis of a poultry processing plant
Svendsen, Eirik Starheim; Hafner, Armin; Selvnes, Håkon; Widell, Kristina Norne (Chapter, 2020)More efficient utilization of primary energy resources can be achieved with thermal energy storages and it is a measure to limit global warming. The thermal energy demands of industrial food-processing plants are non-uniform ... -
Energy flow analysis of an industrial ammonia refrigeration system and potential for a cold thermal energy storage
Widell, Kristina Norne; Svendsen, Eirik Starheim; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin; Nordtvedt, Tom Ståle (Chapter, 2022)There is an increasing effort to reduce energy demand at food processing plants, mainly to reduce the total carbon footprint. The energy demand of a fish processing plant (using ammonia as refrigerant) has been evaluated ... -
Evaluation of a pillow-plate heat exchanger for a pump-circulated CO2 refrigeration system
Selvnes, Håkon; Büttner, Vera; Hafner, Armin (Chapter, 2020)Cold thermal energy storage (CTES) technology integrated into refrigeration systems has been proposed as a solution for peak shaving of refrigeration demands. This paper presents the results obtained from an experimental ... -
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. ... -
Innovative refrigeration concept for passenger ships - combining CO2 refrigerant, cold recovery and cold storage
Pardiñas, Ángel Á.; Selvnes, Håkon; Gabrielii, Cecilia H; Saeed, Muhammad Zahid (Chapter, 2022)More stringent international regulations on ship's emissions require a shift towards more climate friendly fuels, such as liquefied natural gas (LNG). On LNG-driven ships, the fuel is stored onboard at cryogenic temperature. ... -
Integrated CO2 refrigeration and heat pump system for a dairy plant: Energy analysis and potential for cold thermal energy storage
Selvnes, Håkon; Jenssen, Sigmund; Sevault, Alexis Gerard Edouard; Bengsch, Jan; Widell, Kristina Marianne Norne; Ahrens, Marcel Ulrich; Ren, Shuai; Hafner, Armin (Chapter, 2023)Dairy processing is considered very energy-intensive due to significant thermal demands for both cooling and heating at different temperature levels. Conventional dairy plants have separate systems for supplying the various ...