The Experts below are selected from a list of 2304 Experts worldwide ranked by ideXlab platform
V O Petrenko - One of the best experts on this subject based on the ideXlab platform.
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investigation of an experimental ejector Refrigeration Machine operating with refrigerant r245fa at design and off design working conditions part 1 theoretical analysis
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: K O Shestopalov, B J Huang, V O Petrenko, Oleksiy VolovykAbstract:The ejector Refrigeration Machine (ERM) offers several advantages over other heat-driven Refrigeration Machine, including simplicity in design and operation, high reliability and low installation cost, which enable its wide application in the production of cooling. In this paper the theoretical analysis of ejector design and ejector Refrigeration cycle performance is presented. It is shown that ERM performance characteristics depend strongly on the operating conditions, the efficiency of the ejector used, and the thermodynamic properties of the refrigerant used. A 1-D model for the prediction of the entrainment ratio ω, and an optimal design for ejectors with cylindrical and conical-cylindrical mixing chambers are presented in this paper. In order to increase ERM performance values, it is necessary first of all to improve the performance of the ejector.
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investigation of an experimental ejector Refrigeration Machine operating with refrigerant r245fa at design and off design working conditions part 2 theoretical and experimental results
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: K O Shestopalov, B J Huang, V O Petrenko, Oleksiy VolovykAbstract:The main results of a theoretical and experimental investigation of the performance characteristics of an ejector and an ejector Refrigeration Machine (ERM) operating with refrigerant R245fa at design and off-design working conditions are presented. The ejector and ERM were explored theoretically using improved 1D model and the calculated results were validated experimentally on ejector test rig that has been assembled and operated at National Taiwan University. For typical cases, the performance characteristics variation with condensing, generating and evaporating temperatures along with performance maps are presented. The theoretical results are compared with the results of a set of experiments and good qualitative and quantitative agreement is observed.
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Theoretical study and design of a low-grade heat-driven pilot ejector Refrigeration Machine operating with butane and isobutane and intended for cooling of gas transported in a gas-main pipeline
International Journal of Refrigeration, 2011Co-Authors: V O Petrenko, O.s. VolovykAbstract:Abstract This paper describes the construction and performance of a novel combined system intended for natural gas transportation and power production, and for cooling of gas transported in a gas-main pipeline. The proposed system includes a gas turbine compressor, a combined electrogenerating plant and an ejector Refrigeration unit operating with a hydrocarbon refrigerant. The combined electrogenerating plant consists of a high-temperature steam–power cycle and a low-temperature hydrocarbon vapor power cycle, which together comprise a binary vapor system. The combined system is designed for the highest possible effectiveness of power generation and could find wide application in gas-transmission systems of gas-main pipelines. Application of the proposed system would enable year-round power generation and provide cooling of natural gas during periods of high ambient temperature operation. This paper presents the main results of a theoretical study and design performance specifications of a low-grade heat-driven pilot ejector Refrigeration Machine operating with butane and isobutane.
K O Shestopalov - One of the best experts on this subject based on the ideXlab platform.
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investigation of an experimental ejector Refrigeration Machine operating with refrigerant r245fa at design and off design working conditions part 1 theoretical analysis
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: K O Shestopalov, B J Huang, V O Petrenko, Oleksiy VolovykAbstract:The ejector Refrigeration Machine (ERM) offers several advantages over other heat-driven Refrigeration Machine, including simplicity in design and operation, high reliability and low installation cost, which enable its wide application in the production of cooling. In this paper the theoretical analysis of ejector design and ejector Refrigeration cycle performance is presented. It is shown that ERM performance characteristics depend strongly on the operating conditions, the efficiency of the ejector used, and the thermodynamic properties of the refrigerant used. A 1-D model for the prediction of the entrainment ratio ω, and an optimal design for ejectors with cylindrical and conical-cylindrical mixing chambers are presented in this paper. In order to increase ERM performance values, it is necessary first of all to improve the performance of the ejector.
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investigation of an experimental ejector Refrigeration Machine operating with refrigerant r245fa at design and off design working conditions part 2 theoretical and experimental results
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: K O Shestopalov, B J Huang, V O Petrenko, Oleksiy VolovykAbstract:The main results of a theoretical and experimental investigation of the performance characteristics of an ejector and an ejector Refrigeration Machine (ERM) operating with refrigerant R245fa at design and off-design working conditions are presented. The ejector and ERM were explored theoretically using improved 1D model and the calculated results were validated experimentally on ejector test rig that has been assembled and operated at National Taiwan University. For typical cases, the performance characteristics variation with condensing, generating and evaporating temperatures along with performance maps are presented. The theoretical results are compared with the results of a set of experiments and good qualitative and quantitative agreement is observed.
Kostyantyn Shestopalov - One of the best experts on this subject based on the ideXlab platform.
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Theoretical analysis and optimization of a hybrid CO2 transcritical mechanical compression – ejector cooling cycle
International Journal of Refrigeration, 2017Co-Authors: Guangming Chen, Volodymyr Ierin, Oleksii Volovyk, Daibin Zhu, Kostyantyn ShestopalovAbstract:The paper provides the results of a design-theoretical study of a hybrid carbon dioxide (CO2) transcritical mechanical compression – ejector cooling cycle. The hybrid cooling cycle is a combination of a CO2 transcritical mechanical compression Refrigeration Machine (MCRM) powered by electricity, and an ejector cooling Machine (ECM) driven by heat rejected from the CO2 cooling cycle. Refrigerants R245ca, R601b (neopentane) and R717 (ammonia) are investigated as the working fluids of ECM in the present study. A method to determine the optimal design parameters and performance of the hybrid cooling cycle is presented. It is shown, that efficiency growth of the transcritical CO2 cooling cycle due to ejector cooling cycle use is higher as evaporating temperatures are lower.
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Design-theoretical study of hybrid CO2 transcritical mechanical compression-ejector cooling cycle.
2015Co-Authors: G Chen, Volodymyr Ierin, Kostyantyn ShestopalovAbstract:This paper provides the main results of design-theoretical study of the hybrid carbon dioxide (??2) transcritical mechanical compression-ejector cooling cycle. The hybrid Refrigeration cycle is the combination of a CO2 transcritical mechanical compression Refrigeration Machine (MCRM), powered by electricity, and an ejector cooling Machine (ECM) driven by heat rejected in the compression cycle. Refrigerants R245fa, R601b (neopentane) and R717 (ammonia) are selected as the environmentally friendly working fluids of ECM in the present study. A method for determination of the optimal design parameters and performance of the hybrid ??2 transcritical mechanical compression-ejector cooling cycle is presented. The obtained data provide necessary information to design such systems for application in domestic and industrial Refrigeration and air-conditioning systems under different climatic conditions.
Tatiana Morosuk - One of the best experts on this subject based on the ideXlab platform.
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Exergetic and Economic Evaluation of a Transcritical Heat-Driven Compression Refrigeration System with CO2 as the Working Fluid under Hot Climatic Conditions
Entropy, 2019Co-Authors: Jing Luo, George Tsatsaronis, Tatiana Morosuk, Bourhan TashtoushAbstract:The purpose of this research is to evaluate a transcritical heat-driven compression Refrigeration Machine with CO2 as the working fluid from thermodynamic and economic viewpoints. Particular attention was paid to air-conditioning applications under hot climatic conditions. The system was simulated by Aspen HYSYS® (AspenTech, Bedford, MA, USA) and optimized by automation based on a genetic algorithm for achieving the highest exergetic efficiency. In the case of producing only Refrigeration, the scenario with the ambient temperature of 35 °C and the evaporation temperature of 5 °C showed the best performance with 4.7% exergetic efficiency, while the exergetic efficiency can be improved to 22% by operating the system at the ambient temperature of 45 °C and the evaporation temperature of 5 °C if the available heating capacity within the gas cooler is utilized (cogeneration operation conditions). Besides, an economic analysis based on the total revenue requirement method was given in detail.
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Exergoeconomic Analysis Of Carbon Dioxide Transcritical Refrigeration Machines
International Journal of Refrigeration, 2014Co-Authors: Farivar Fazelpour, Tatiana MorosukAbstract:Abstract In the last two decades many scientific papers and reports have been published in the field of the application of the carbon dioxide as a refrigerant for Refrigeration (heat pump) systems. A simple transcritical CO2 Refrigeration Machine is evaluated from the perspectives of energetic, exergetic, economic and exergoeconomic analyses. Special attention has been paid to the transcritical cycle under hot climatic conditions. The main goal of this paper is to define the energy and cost efficient transcritical CO2 Refrigeration Machine, therefore the options for the structure and parametric improvements are discussed. Introducing the economizer as an auxiliary component for one-stage transcritical CO2 Refrigeration Machine helps us to decrease the total cost of the final product by approximately 14%.
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conventional thermodynamic and advanced exergetic analysis of a Refrigeration Machine using a voorhees compression process
Energy Conversion and Management, 2012Co-Authors: Tatiana Morosuk, George Tsatsaronis, Congyu ZhangAbstract:Abstract The Voorhees’ compression process is used in Refrigeration as an alternative process to the two-stage vapor-compression Refrigeration Machines that are commercially available. This process is a combination of a compression process initially at constant total volume and then at near isentropic conditions. The compression process at constant total volume is realized with the help of injection of working fluid in the beginning of the compression process. Several factors (related to the simulation of the process and to stable operation) did not allow the wide use of this process (compressor) in the past. With today’s state of the art of compressors, automation systems and control systems, the idea of Voorhees became reality with screw and scroll compressors. However, all developments are based on data obtained from experimental research. All publications, where the concept of the Voorhees’ compression process is discussed, deal only with energetic analyses. For the first time, in addition to the detailed energetic analysis, and in order to show the limitations of the energetic analysis for such a complex process, a conventional and an advanced exergetic analysis are presented.
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A new approach to the exergy analysis of absorption Refrigeration Machines
Energy, 2008Co-Authors: Tatiana Morosuk, George TsatsaronisAbstract:Splitting the exergy destruction into endogenous/exogenous and unavoidable/avoidable parts represents a new development in the exergy analysis of energy conversion systems. This splitting improves the accuracy of exergy analysis, improves our understanding of the thermodynamic inefficiencies and facilitates the improvement of a system. An absorption Refrigeration Machine is used here as an application example. This Refrigeration Machine represents the most complex type of a Refrigeration Machine, in which the sum of physical and chemical exergy is used for each material stream.
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Advanced Exergoeconomic Evaluation and Its Application to Compression Refrigeration Machines
Volume 6: Energy Systems: Analysis Thermodynamics and Sustainability, 2007Co-Authors: George Tsatsaronis, Tatiana MorosukAbstract:Splitting the exergy destruction within each component of an energy conversion system into endogenous/exogenous and unavoidable/avoidable parts enhances an exergy analysis and improves the quality of the conclusions obtained from the analysis. The potential for improving each system component is identified and priorities, according to which the design of components should be modified, are established. We call this detailed exergy analysis advanced exergy analysis. For improving the cost effectiveness of an energy conversion system, splitting the investment cost into endogenous/exogenous and unavoidable/avoidable parts is also helpful. The designer should focus on the avoidable thermodynamic inefficiencies (exergy destruction), their costs and the avoidable investment costs. The paper discusses the calculation of these costs in general and the resulting advanced exergoeconomic evaluation that is based on the avoidable endogenous and the avoidable exogenous values for exergy destruction, cost of exergy destruction and investment cost. An application of this methodology to a compression Refrigeration Machine is presented.Copyright © 2007 by ASME
Oleksiy Volovyk - One of the best experts on this subject based on the ideXlab platform.
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investigation of an experimental ejector Refrigeration Machine operating with refrigerant r245fa at design and off design working conditions part 1 theoretical analysis
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: K O Shestopalov, B J Huang, V O Petrenko, Oleksiy VolovykAbstract:The ejector Refrigeration Machine (ERM) offers several advantages over other heat-driven Refrigeration Machine, including simplicity in design and operation, high reliability and low installation cost, which enable its wide application in the production of cooling. In this paper the theoretical analysis of ejector design and ejector Refrigeration cycle performance is presented. It is shown that ERM performance characteristics depend strongly on the operating conditions, the efficiency of the ejector used, and the thermodynamic properties of the refrigerant used. A 1-D model for the prediction of the entrainment ratio ω, and an optimal design for ejectors with cylindrical and conical-cylindrical mixing chambers are presented in this paper. In order to increase ERM performance values, it is necessary first of all to improve the performance of the ejector.
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investigation of an experimental ejector Refrigeration Machine operating with refrigerant r245fa at design and off design working conditions part 2 theoretical and experimental results
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: K O Shestopalov, B J Huang, V O Petrenko, Oleksiy VolovykAbstract:The main results of a theoretical and experimental investigation of the performance characteristics of an ejector and an ejector Refrigeration Machine (ERM) operating with refrigerant R245fa at design and off-design working conditions are presented. The ejector and ERM were explored theoretically using improved 1D model and the calculated results were validated experimentally on ejector test rig that has been assembled and operated at National Taiwan University. For typical cases, the performance characteristics variation with condensing, generating and evaporating temperatures along with performance maps are presented. The theoretical results are compared with the results of a set of experiments and good qualitative and quantitative agreement is observed.