Browsing NTNU Open by Author "Pardiñas, Ángel Á."
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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 ... -
ANN modelling of CO2 refrigerant cooling system COP in a smart warehouse
Opalic, Sven Myrdahl; Goodwin, Morten; Lei, Jiao; Nielsen, Henrik Kofoed; Pardiñas, Ángel Á.; Hafner, Armin; Kolhe, Mohan Lal (Peer reviewed; Journal article, 2020)Industrial cooling systems consume large quantities of energy with highly variable power demand. To reduce environmental impact and overall energy consumption, and to stabilize the power requirements, it is recommended to ... -
Characteristics of evaporation of propane (R290) in compact smooth and microfinned tubes
Allymehr, Ehsan; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin (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 ... -
CO2 cooling challenges at CERN for the future phase 2 upgrade program
Verlaat, B; Petagna, P.; Zwalinski, L; Daguin, J.; Giakoumi, D.; Bhanot, V; Battistin, M; Hafner, Armin; Collot, J; Postema, H; Tropea, P; Blust, Stefanie; Hanf, P; Pardiñas, Ángel Á. (Chapter, 2019)At CERN, evaporative CO2 is the baseline cooling solution for the thermal management of the phaseII silicon detectors which will be installed in 2025 in the ATLAS and CMS experiments. Since 2008 CO2 cooling is used in 3 ... -
Data-driven modeling of a CO2 refrigeration system
Andreasen, Glenn; Stoustrup, Jakob; Izadi-Zamanabadi, Roozbeh; Pardiñas, Ángel Á.; Hafner, Armin (Peer reviewed; Journal article, 2019)This paper describes a data-driven method for system identification of a CO 2 refrigeration system. Traditionally, the interaction between the measured variables is not utilized as they are highly dependent on the refrigeration ... -
Data-driven modelling of a R744 refrigeration system with parallel compression configuration
Andreasen, Glenn; Stoustrup, Jakob; Pardiñas, Ángel Á.; Hafner, Armin; Izadi-Zamanabadi, R. (Chapter, 2019)The type and characteristics of the employed components, subsystems and refrigerant in a commercial refrigeration system varies significantly depending on required functionalities (e.g. MT (medium temperature), LT (low ... -
Design of an Experimental ORC Expander Setup Using Natural Working Fluids
Pardiñas, Ángel Á.; Pilarczyk, Marcin; Agromayor, Roberto; Nord, Lars O. (Chapter, 2019)Organic Rankine Cycles (ORC) are an efficient and cost-effective technology to generate power from waste heat. Arguably, the two most important factors affecting the performance of the Rankine cycle are the choice of working ... -
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 use and retrofitting potential of heat pumps in cold climate hotels
Smitt, Silje Marie; Tolstorebrov, Ignat; Gullo, Paride; Pardiñas, Ángel Á.; Hafner, Armin (Peer reviewed; Journal article, 2021)Tourism, and thereby hotels, play a crucial role in the European economy. The hotel sector features high energy consumption, which greatly contributes to the global warming effect. Thus, there is a need to investigate ... -
Evaluation of Integrated Concepts with CO2 for Heating, Cooling and Hot Water Production
Smitt, Silje Marie; Pardiñas, Ángel Á.; Hafner, Armin (Journal article; Peer reviewed, 2021)The hotel sector is characterized by high thermal demands and a large carbon footprint, which greatly contributes to the global warming effect. Consequently, there is a need to investigate solutions that can reduce energy ... -
Experimental evaluation of the performance of an ejector for a single compression multi-temperature CO2 refrigeration unit
Fabris, F; Pardiñas, Ángel Á.; Marinetti, Sergio; Rossetti, Antonio; Hafner, Armin; Minetto, Silvia (Chapter, 2022)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 ... -
Experimental investigation of CO2 systems for Indian supermarkets with parallel configuration of multiejectors (INDEE)
Banasiak, Krzysztof; Singh, Simarpreet; Hafner, Armin; Maiya, Prakash; Nekså, Petter; Pardiñas, Ángel Á. (Chapter, 2019)Experimental investigation of transcritical R744 pack for Indian supermarkets was performed. Parallel combination of expansion work recovery multiejector blocks was applied for optimization of energy performance of the ... -
Experimental investigation on integrated two-stage evaporators for CO2 heat-pump chillers
Hafner, Armin; Hazarika, Mihir Mouchum; Lechi, Federico; Zorzin, Alvaro; Pardiñas, Ángel Á.; Banasiak, Krzysztof (Chapter, 2022)In this experimental study the performance of novel compact evaporator configuration was investigated. What makes this evaporator configuration unique is the integration of a gravity-fed/ self-circulation evaporator loop ... -
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. ... -
Innovative reheat approach of the TES system during the hotel’s standstill operation utilizing a CO2 heat pump/chiller unit
Elarga, Hagar Hassan Hassanein Hassan; Pardiñas, Ángel Á.; Minetto, Silvia; Hafner, Armin (Chapter, 2023)The implementation of CO2 as a refrigerant is considered one of the solutions to improve the overall building’s energy performance, especially if the heat recovery concept is applied. In this paper, an innovative approach ... -
Integrated R744 ejector supportet parallel compression racks for supermarkets : experimental results
Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof (Chapter, 2018)R744 is currently the preferred solution in the commercial refrigeration sector for most regions, but the limited efficiency of such systems under high temperatures constrains its expansion. Technologies such as parallel ... -
Modeling of a CO2‐Based Integrated Refrigeration System for Supermarkets
Pardiñas, Ángel Á.; Jokiel, Michael; Schlemminger, Christian; Selvnes, Håkon; Hafner, Armin (Peer reviewed; Journal article, 2021)An integrated energy system that consists of a centralized refrigeration unit can deliver the entire HVAC&R (heating, ventilation, air conditioning, and refrigeration) demand for a supermarket. CO2 (R744) is a natural ... -
Modelling and development of high-pressure-lift ejector for low temperature evaporators in R744 refrigeration systems for supermarkets
Banasiak, Krzysztof; Pardiñas, Ángel Á.; Kriezi, Ekaterini E.; Hafner, Armin (Chapter, 2019) -
Multi Ejector and pivoting-supported R744 application with AC for supermarkets
Contiero, Luca; Hafner, Armin; Pardiñas, Ángel Á. (Chapter, 2021)CO2 refrigeration units are gaining market shares thanks to the ability to provide an energy efficient performance for industrial and commercial refrigeration applications in any climate. As with all the applications, the ... -
Next generation of ejector-supported R744 booster systems for commercial refrigeration at all climates
Pardiñas, Ángel Á.; Selvnes, Håkon; Banasiak, Krzysztof; Hafner, Armin (Peer reviewed; Journal article, 2023)The pernicious effects of synthetic refrigerants on different environmental aspects leave natural refrigerants as the only alternative for vapour compressions systems. Among natural refrigerants, CO2 (R744) has become the ...