Blar i Institutt for energi og prosessteknikk på forfatter "Banasiak, Krzysztof"
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Experimental analysis of the R744 vapour compression rack equipped with the multi-ejector expansion work recovery module
Haida, Michal Piotr (Master thesis, 2015)Present supermarket refrigeration systems, with carbon dioxide as a refrigerant, indicate high-efficiency performance and they are commonly installed in throughout Europe. The refrigeration systems with R744 have still a ... -
Experimental and computational analysis of a R744 flashing ejector
Giacomelli, Francesco; Mazzelli, Federico; Banasiak, Krzysztof; Hafner, Armin; Milazzo, Adriano (Journal article; Peer reviewed, 2019)In this paper we present a set of experimental data acquired on a CO2 flashing ejector designed for expansion loss recovery applications. Experimental results are compared with CFD simulations obtained using a Homogeneous ... -
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 and numerical investigation on a ejector for CO2 vapor compression systems
Giacomelli, Francesco; Banasiak, Krzysztof; Hafner, Armin; Mazzelli, Frederico; Milazzo, Adriano (Chapter, 2018)The use of two-phase flashing ejectors to improve the COP and capacity of CO2 vapor compression systems has become a key research topic in recent years. Although many experimental investigations focused on both the ejector ... -
Experimental and numerical study on the R744 ejector with a suction nozzle bypass
Bodys, Jakub; Smołka, Jacek; Palacz, Michał; Haida, Michal; Banasiak, Krzysztof; Nowak, Andrzej J (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 Evaluation of a Multi-Ejector Trans-critical CO2 System for Supermarkets
Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Maiya, Prakash; Nekså, Petter (Chapter, 2019)In the present experimental study, the performance of a multi-ejector based trans-critical CO2 cooling system is tested at high ambient temperature up to 46°C for a supermarket application with and without internal heat ... -
Experimental evaluation of multi-ejector based CO2 cooling system for supermarkets in tropical zones
Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Maiya, Prakash M.; Nekså, Petter (Chapter, 2018)Cooling system for supermarkets, now-a-days in developing countries like India, mainly uses man-made synthetic refrigerants/mixtures such as R134a, R404A and R410A (HFCs). These fluorinated refrigerants possess an outrageous ... -
Experimental investigation of a transcritical CO2 refrigeration system incorporating rotary gas pressure exchanger and low lift ejectors
Saeed, Muhammad Zahid; Thatte, Azam; Banasiak, Krzysztof; Hafner, Armin; Pardiñas, Angel A. (Journal article; Peer reviewed, 2024)Natural refrigerants like CO2 are playing a significant role in making refrigeration and heat pump systems climate-friendly by slowly phasing out the high global warming refrigerants like hydrofluorocarbons (HFCs). However, ... -
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 ... -
An experimental study of an ejector-boosted transcritical R744 refrigeration system including an exergy analysis
Elbarghthi, Anas F.A.; Hafner, Armin; Banasiak, Krzysztof; Dvorak, Vaclav (Peer reviewed; Journal article, 2021)The field of refrigeration witness a massive transition in the supermarket with a strong focus reflected on energy consumption. The use of ejector allows for overcoming the significant exergy destruction lays on the expansion ... -
Experimental study of the heat transfer problem in expansion devices in CO2 refrigeration systems
Mastrowski, Mikolaj; Smolka, Jacek; Hafner, Armin; Haida, Michal; Palacz, Michal; Banasiak, Krzysztof (Journal article; Peer reviewed, 2019)Two expansion devices designed for CO2 refrigeration systems namely, capillary tube and fixed-geometry ejector were experimentally tested in the SINTEF/NTNU laboratory in Trondheim, Norway to determine the influence of ... -
Heat pump/chiller system for centralized kitchens in India
Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Seshadri, Satyanarayanan; Maiya, Prakash; Smitt, Silje Marie; Gabrielii, Cecilia H (Chapter, 2020)A heat pump unit using CO2 as working fluid is designed to meet not only a part of the heating demand in the centralised kitchen at The Akshaya Patra Foundation, Bengaluru, India, but also the entire cooling demand to ... -
HEM and HRM accuracy comparison for the simulation of CO2 expansion in two-phase ejectors for supermarket refrigeration systems
Palacz, Michal; Haida, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin (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 ... -
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 ... -
Machine learning and CFD for mapping and optimization of CO2 ejectors
Ringstad, Knut Emil; Banasiak, Krzysztof; Ervik, Åsmund; Hafner, Armin (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 ... -
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) -
Modified homogeneous relaxation model for the r744 trans-critical flow in a two-phase ejector
Haida, Michal; Smolka, Jacek; Hafner, Armin; Palacz, Michal; Banasiak, Krzysztof; Nowak, Andrzej J. (Journal article; Peer reviewed, 2017)The proposed modified homogeneous relaxation model (HRM) applied to the numerical model of a CO2 two-phase ejector was numerically investigated and developed based on the optimisation of the relaxation time (RT) correlation. ... -
Multi-Ejector Concept: A Comprehensive Review on its Latest Technological Developments
Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof; Minetto, Silvia; Kriezi, Ekaterini E. (Journal article; Peer reviewed, 2019)The adoption of the EU F-Gas Regulation 517/2014 and the resulting development of the multi-ejector concept have led carbon dioxide to take center stage as the sole refrigerant (R744) in several applications. Therefore, a ... -
Multiejector CO2 cooling system with evaporative gascooler for a supermarket application in tropical regions
Singh, Simarpreet; Hafner, Armin; Maiya, M.P.; Banasiak, Krzysztof; Nekså, Petter (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 ...