scholarly journals Simulation and Exergy Analysis of a Refrigeration System Using an Open-Source Web-Based Interactive Tool—Comparison of the Conventional Approach and a Novel One for Avoidable Exergy Destruction Estimation

2021 ◽  
Vol 11 (23) ◽  
pp. 11535
Author(s):  
Volodymyr Voloshchuk ◽  
Paride Gullo ◽  
Eugene Nikiforovich ◽  
Nadia Buyak
Keyword(s):  
Energy Conversion ◽  
Open Source ◽  
Exergy Analysis ◽  
Exergy Destruction ◽  
Refrigeration System ◽  
Web Based ◽  
New Approach ◽  
Interactive Tool ◽  
Conversion System ◽  
Energy Conversion System

Avoidable endogenous/exogenous parts of the exergy destruction in the components of an energy conversion system can be computed by applying advanced exergy analysis. Their calculation is crucial for the correct assessment of the real thermodynamic enhancement achievable by the investigated energy conversion system. This work proposes a new approach to estimate the avoidable exergy destruction rates of system components, being more rigorous compared to the conventional method due to the elimination of the need for the implementation of theoretical assumptions associated with the idealization of processes. An open-source web-based interactive tool was implemented to contrast the results of the conventional advanced exergy analysis to those involving the new approach for avoidable exergy destruction estimation. The comparison was based on the same case study, i.e., a refrigeration system selected from the literature. It was observed that the developed tool can be properly employed for comparing the two approaches within exergy analyses, and the results obtained presented some differences for the compressor and the condenser. Compared to the new approach, the existing methodology of advanced exergy analysis suggests lower values of the avoidable part of exergy destruction, which can be reduced by improving the efficiency of the compressor and the condenser. Moreover, the avoidable parts of exergy destruction, which could be removed within these components by improving the efficiencies of the remaining components, were higher in the case of the application of the existing advanced exergetic analysis as compared with the findings obtained by the proposed approach. These differences were due to the impossibility of the existing advanced exergy analysis to implement complete thermodynamic “idealization” for the condenser and evaporator.

Advanced Exergoeconomic Evaluation and Its Application to Compression Refrigeration Machines

2007 ◽  
Author(s):  
George Tsatsaronis ◽  
Tatiana Morosuk
Keyword(s):  
Energy Conversion ◽  
Exergy Analysis ◽  
System Component ◽  
Exergy Destruction ◽  
Conversion System ◽  
Investment Cost ◽  
Energy Conversion System ◽  
The Cost ◽  
Refrigeration Machine

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.

scholarly journals Advanced exergetic analysis of a heat pump providing space heating in built environment

Energetika ◽  
2017 ◽  
Vol 63 (3) ◽  
Author(s):  
Volodymyr A. Voloshchuk
Keyword(s):  
Built Environment ◽  
Energy Conversion ◽  
Heat Pump ◽  
System Component ◽  
Space Heating ◽  
Exergy Destruction ◽  
Operating Modes ◽  
Conversion System ◽  
Energy Conversion System ◽  
Exergetic Analysis

In addition to conventional exergy-based methods, advanced exergetic analyses consider the interactions among components of the energy-conversion system and the real potential for improving each system component. The paper demonstrates the results of application of a detailed advanced exergetic analysis to a wastewater source heat pump providing space heating in the built environment. In order to determine thermodynamic parameters of the refrigeration vapour compression cycle in different operating modes, the simulation model has been used. The analysis includes splitting the exergy destruction within each component of a heat pump into unavoidable, avoidable, endogenous and exogenous parts as well as detailed splitting of the avoidable exogenous exergy destruction. Besides, variabilities of heating demands of a building within both the chosen heating season and also from year to year are taken into account. Distribution of the split exergy destructions during different periods of time is also presented for the analysed cases of the heat pump and built environment. It is shown that in the investigated system only about 50% of the total annual destruction in components of the heat pump can be avoided. About 30…40% of this avoidable thermodynamic inefficiency is caused by interactions among components. Based on the applied advanced exergetic analysis it is possible to receive more precise and useful information for better understanding and improving the design and operation of the analysed energy-conversion system.

103 Visualization of Loss in Energy Conversion System using Exergy Analysis

2012 ◽  
Vol 2012.87 (0) ◽  
pp. _1-14_
Author(s):  
Tsutomu WAKABAYASHI ◽  
Yoshinori HISAZUMI ◽  
Tsukasa HORI ◽  
Akeshi KEGASA
Keyword(s):  
Energy Conversion ◽  
Exergy Analysis ◽  
Conversion System ◽  
Energy Conversion System

Formation of Environmental Impacts in Energy Conversion Processes Revealed by a Novel Exergoenvironmental Analysis

2007 ◽  
Author(s):  
Lutz Meyer ◽  
Jens Buchgeister ◽  
George Tsatsaronis ◽  
Liselotte Schebek
Keyword(s):  
Environmental Impact ◽  
Energy Conversion ◽  
Environmental Impacts ◽  
Ecological Impact ◽  
Economic Problem ◽  
Special Focus ◽  
Exergy Destruction ◽  
Conversion System ◽  
Energy Conversion System ◽  
The Impact

An exergoenvironmental analysis has been developed that reveals to what extent each component of an energy conversion system is responsible for the overall environmental impact, and identifies the sources of the impact. The approach of the exergoeconomic analysis is modified to deal, instead with an economic problem, with an evaluation of the ecological impact. The basic idea is that exergy represents a proper basis for assigning both costs and environmental impact in energy conversion processes. As a case study, an energy conversion system consisting of a high-temperature solid oxide fuel cell integrated with an allothermal biomass gasification process has been analyzed. The exergoenvironmental analysis allows to identify the environmentally most relevant system components and provides information about possibilities for design improvements. A special focus is laid on the role of exergy destruction. It is shown that the location of the exergy destruction in the process has influence on the resulting environmental impacts. A certain amount of exergy destruction leads to a different extent to environmental impacts depending on the position of the component where the exergy destruction occurs. The exergoenvironmental analysis reveals the thermodynamic inefficiencies that have the greatest environmental impacts.

scholarly journals Avoidable and unavoidable exergy destruction and exergoeconomic evaluation of the thermal processes in a real industrial plant

2012 ◽  
Vol 16 (suppl. 2) ◽  
pp. 433-446 ◽  
Author(s):  
Goran Vuckovic ◽  
Mica Vukic ◽  
Mirko Stojiljkovic ◽  
Dragan Vuckovic
Keyword(s):  
Energy Conversion ◽  
Exergy Analysis ◽  
Industrial Plant ◽  
Universal Method ◽  
Steam Boiler ◽  
Exergy Destruction ◽  
Additional Information ◽  
Boiler Operation ◽  
Energy Conversion System ◽  
Exergy Analyses

Exergy analysis is a universal method for evaluating the rational use of energy. It can be applied to any kind of energy conversion system or chemical process. An exergy analysis identifies the location, the magnitude and the causes of thermodynamic inefficiencies and enhances understanding of the energy conversion processes in complex systems. Conventional exergy analyses pinpoint components and processes with high irreversibility. To overcome the limitations of the conventional analyses and to increase our knowledge about a plant, advanced exergy-based analyses are developed. These analyses provide additional information about component interactions and reveal the real potential for improvement of each component constituting a system, as well as of the overall system. In this paper, a real industrial plant is analyzed using both conventional and advanced exergy analyses, and exergoeconomic evaluation. Some of the exergy destruction in the plant components is unavoidable and constrained by technological, physical and economic limitations. Calculations related to the total avoidable exergy destruction caused by each component of the plant supplement the outcome of the conventional exergy analysis. Based on the all-reaching analysis, by improving the boiler operation (elimination of approximately 1 MW of avoidable exergy destruction in the steam boiler) the greatest improvement in the efficiency of the overall system can be achieved.

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