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Performance Study and Multi-Objective Optimization of a Two-Temperature CO_(2) Refrigeration System with Economizer Based on Energetic, exergetic and Economic Analysis

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Journal of Thermal Science 2022年第5期31卷 1416-1433页

作者： LIU Guangdi ZHAO Hongxia WANG Zheng ABDULWAHID Alhasan Ali HAN Jitian School of Energy and Power engineering Shandong UniversityJi’nan250061China

A two temperature CO_(2) refrigeration system with economizer is proposed and compared with the traditional dual-temperature CO_(2) refrigeration system based on energy consumption,exergy and economic *** genetic algorithm multi-objective optimization method,taking the COP,exergy loss and total economic cost as the objective functions to find the best design conditions of the two *** Pareto fronts are obtained at different ambient *** for order preference by similarity to an ideal solution decision-making method is adopted to determine the optimum state *** simulation results show that when operating at different ambient temperatures,the introduction of economizer can improve COP,reduce exergy loss and the overall economic cost rate of the two-temperature CO_(2) refrigeration *** addition,economic analyses take the impact of carbon dioxide emission cost and electricity price into *** results indicate that with the increase of CO_(2) emission cost and electricity price,the hourly economic cost of both systems increases,but the hourly economic cost of the two-temperature CO_(2) refrigeration system with economizer system is always lower than that of conventional two-temperature CO_(2) refrigeration system.

关键词： two-temperature refrigeration CO_(2) multi-objective optimization energy exergetic economic cost

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Optical, Energetic and exergetic Analyses of Parabolic Trough Collectors

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Chinese Physics Letters 2007年第7期24卷 1787-1790页

作者： OZTURK Murat, CICEK BEZiR Nalan OZEK Nuri Department of Physics Science-Literature Faculty Siileyman Demirel University Isparta TUrkey

Parabolic trough collectors generate thermal energy from solar energy. Especially, they are very convenient for applications in high temperature solar power systems. To determine the design parameters, parabolic trough collectors must be analysed with optical analysis. In addition, thermodynamics （energy and exergy） analysis in the development of an energy efficient system must be achieved. Solar radiation passes through Earth＇s atmosphere until it reaches on Earth＇s surface and is focused from the parabolic trough collector to the tube receiver with a transparent insulated envelope. A11 of them constitute a complex mechanism. We investigate the geometry of parabolic trough reflector and characteristics of solar radiation to the reflecting surface through Earth＇s atmosphere, and calculate the collecting totM energy in the receiver. The parabolic trough collector, of which design parameters are given, is analysed in regard to the energy and exergy analysis considering the meteorological specification in May, June, July and August in 1sparta/TUrkey, and the results are presented.

关键词： exergetic Parabolic Collectors

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exergetic Efficiencies Evaluation of Flows and Operations on the Mechanical Extraction Process of <i>Jatropha curcas</i>Oil

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Open Journal of Energy Efficiency 2019年第1期8卷 1-20页

作者： Rolf Nirahina Rakoto Harifidy Hery Tiana Rakotondramiarana Institute for the Management of Energy (IME) University of Antananarivo Antananarivo Madagascar

Jatropha curcas oil is one of the most promising renewable energy sources for rural areas due to its ease of production, which can be used as an alternative to diesel and fuel oil. The development of sustainable energy has been the issue of the discussion about biofuel production given the considerable consumption amount of fossil fuel during the transformation process. And any production process that consumes a lot of energy records a significant destruction of useful energy, which leads to thermodynamic inefficiencies of the process. Besides, the focus on environmental safety is gradually shifting towards energy efficiency in industrial processing. exergetic analysis is an effective tool for measuring the performance of a production process since exergy is a quantity that measures energy quality. This study assesses the scale of resource degradation in Jatropha oil mechanical extraction processes and finds improving possible pretreatments options for more efficient production. Data from experiments combined with existing databases have permitted to establish the exergy flow balance at each stage of production. The process exergetic yield varies from 29.85% to 35.41% according to the chosen pretreatment process. Mass exergy accounts for 67% of incoming flows and, for outgoing flows, more than 60% is associated with the mass exergy generated by the process waste. The uncertainties analysis on the results was used to validate model results, and to visualize the minimum values for the most unfavorable cases and the maximum values when all the parameters are at their optimum values.

关键词： Jatropha Oil Extraction Process exergetic Efficiency Pretreatment Mass Exergy

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