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Comparative Study on Two-Stage absorption refrigeration Systems with Different Working Pairs

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Journal of Shanghai Jiaotong university(Science) 2021年第2期26卷 155-162页

作者： KONG Xiangqiang MENG Xiangri LI Jianbo SHANG Yamping CUFulin College of Mechanical and Electronic Engineering Shandong University of Science and Technology.Qingdao 266590ShandongChina

The objective of this paper is to present a simulation study on the two-stage absorption refrigeration systems of 2.5 kW capacity using LiBr-H2O,NH3-H2O and R124-DMAC as working *** the design condition that the generating,absorbing,evaporating and condensing temperatures are 75℃,45℃,5℃and 40℃,respectively,the high and low pressure side solution circulation ratios and the coefficient of performance(COP)for the systems are *** the influences of medium,generating,absorbing,evaporating and condensing temperatures on system performances are *** results show that under the design condition,the COP of the LiBr-H2Osystem can reach 0.49,superior to those of the NH3-H2O and R124-DMAC systems,which are 0.32 and 0.31,***,the medium temperature for higher COP lies in an interval of 64-67℃for the ***3-H2O and R124-DMAC *** generating temperature and low absorbing temperature can decrease the high and low pressure side solution circulation ratios,and can also increase the *** evaporating temperature can decrease the low pressure side solution circulation ratio and increase the *** condensing temperature can decrease the high pressure side solution circulation ratio and increase the COP.

关键词： absorption refrigeration two-stage system working pair cycle characteristics

Integration of solid-oxide fuel cells and absorption refrigeration for efficient combined cooling,heat and power production

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Clean Energy 2020年第4期4卷 328-348页

作者： Krzysztof Matuszny Tohid N.Borhani Seyed A.Nabavi Dawid P.Hanak Energy and Power School of WaterEnergy and EnvironmentCranfield UniversityBedfordBedfordshireMK430ALUK School of Engineering and Physical Sciences Heriot-Watt UniversityEdinburghEH144ASUK

Combined cooling,heating and power(CCHP)systems are characterized by a substantially higher energy-utilization efficiency compared to standalone *** this study,an integrated system comprising a solid-oxide fuel cell(SOFC),hot-water storage tank(HWST)and absorption refrigeration(AR)cycle is *** SOFC model was developed in Aspen Plus®.It was used to determine the thermodynamic properties of the exhaust gas that was then used to provide heat for the HWST and to drive the AR *** models for the AR cycles were developed in Engineering Equation Solver,considering LiBr-H2O and NH3-H2O as working *** sensitivity analysis of a number of SOFC output parameters has been carried *** most optimal case was characterized with the coefficient of performance(COP)and CCHP efficiency of 0.806 and 85.2%for the LiBr-H2O system,and 0.649 and 83.6%for the NH3-H2O system,*** such optimal operating conditions,the SOFC was characterized by the net electrical efficiency of 57.5%and the net power output of 123.66 *** from the optimal solution were used to perform the thermodynamic study and sensitivity analysis to assess the influence of different absorption cycle operating conditions and to identify possible applications for the considered integrated systems.

关键词： solid-oxide fuel cell absorption refrigeration hot-water storage tank process integration tri-generation

Multiobjective-Multicriterion Decision Making for Selecting Design Scheme of an absorption refrigeration System

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Systems Science and Systems Engineering 1993年第3期3卷 233-242页

作者： WANG Shiding Shaanxi Institute of Mechanical Engineering, Xi’anLI Shan Xi’an Jiaotong University, Xi’an

In this paper, first, a biobjective thermodynamics model of minimizing comprehensive quantity of boiler vapour consumption and maximizing thermodynamics efficiency of an absorption refrigeration system is established, solved by a multiobjective optimization method to generate a non-inferior scheme set. Then, applying fuzzy multicriterion decision method, a best compromise scheme is selected by taking account of five factors-investment, operation cost, total water consumption, compactness of apparatus and difficulty of operation and maintenance. In addition, other complex factors are considered simultaneously which can hardly be treated by classical methods. The decision thought and method in this paper is of certain universal significance to problems of scheme optimization.

关键词： absorption refrigeration thermodynamics efficiency multiobjective decision making dynamic programming fuzzy relation.

Double Loop Energy-Saving Control for Single-Effect LiBr/H2O absorption refrigeration System

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Double Loop Energy-Saving Control for Single-Effect LiBr/H2O...

Analysis of an electricity-cooling cogeneration system for waste heat recovery of gaseous fuel engines

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作者： Zhenchang Liu Aiguo Wu Haitang Wen School of Electrical and Information Engineering Tianjin University Tianjin Electronic Information College

Given the problem that the single closed-loop control strategy commonly used in the absorption refrigeration system can only meet the refrigeration capacity demand but cannot guarantee the system’s high-efficiency operation,a double loop energy-saving control strategy for the single-effect Li Br/H2 O absorption refrigeration system is *** establishing the system’s energy consumption model,the coupling characteristics between the system parameters are analyzed,and the system optimization constraints are also putting *** the system’s highest overall energy efficiency as the optimization objective,a particle swarm optimization algorithm is used to optimize the system working point on line according to the system operating conditions and load demand to realize the system’s energy-saving *** simulation results show that in comparison with the single closed-loop control scheme,the double loop energy-saving control strategy proposed in this paper can improve the system’s total energy efficiency by 19.3% under 60% load conditions.

关键词： absorption refrigeration LiBr setpoint optimization energy-saving control

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Science China(Technological Sciences) 2015年第1期58卷 37-46页

作者： SHU GeQun WANG Xuan TIAN Hua LIANG YouCai LIU Yu LIU Peng State Key Laboratory of Engines Tianjin University

Waste heat recovery(WHR)is one of the most useful ways to improve the efficiency of internal combustion engines,and an electricity-cooling cogeneration system(ECCS)based on Rankin-absorption refrigeration combined cycle for the WHR of gaseous fuel engines is proposed in the *** system can avoid wasting the heat in condenser so that the efficiency of the whole WHR system improves,but the condensing temperature of Rankin cycle(RC)must increase in order to use absorption refrigeration system,which leads to the decrease of RC output ***,the relationship between the profit of absorption refrigeration system and the loss of RC in this combined system is the mainly studied content in the *** the energy quality of cooling and electricity are different,cooling power in absorption refrigeration is converted to corresponding electrical power consumed by electric cooling system,which is defined as equivalent electrical *** this method,the effects of some important operation parameters on the performance of the ECCS are researched,and the equivalent efficiency,exergy efficiency and primary energy rate are compared in the paper.

关键词： gaseous fuel engines waste heat recovery electricity-cooling cogeneration Rankin cycle absorption refrigeration

Introducing a proper hydrogen liquefaction concept for using wasted heat of thermal power plants-case study: Parand gas power plant

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Chinese Journal of Chemical Engineering 2021年第12期34卷 187-196页

作者： Hamed Rezaie Azizabadi Masoud Ziabasharhagh Mostafa Mafi Faculty of Mechanical Engineering K.N.Toosi University of TechnologyTehranIran Department of Mechanical Engineering Imam Khomeini International UniversityQazvinIran

A hydrogen liquefaction concept with an innovative configuration and a capacity of 4 kg·s^(-1)(345.6 t·d^(-1))is *** concept involves an ammonia absorption refrigeration system for the pre-cooling of hydrogen and MR streams from 25℃ to-30℃.The ammonia absorption refrigeration system is fed by exhaust gases of the Pa rand gas power plant that are normally dissipated to the environment with a temperature of 546℃.The simulation is performed by Aspen HYSYS V9.0,using two separate equations of state for simulating hydrogen and MR streams to gain more accurate results especially for ortho-para *** show that conversion enthalpy estimated by Aspen HYSYS,fits very well to the experimental *** the important independent variables and composition of MRs are done using trial and error procedure,a functional and straightforward method for complicated *** minimum temperature limit in the cooling section is lowered,and an ortho-para converter is implemented in this *** proposed concept performs well from energy aspects and leads to COP and SEC equal to 0.271 and 4.54 kW·h·kg^(-1),*** main advantage of this study is in the low SEC,eliminating the losses of the distribution network,and improving the ability of the hydrogen liquefaction for energy storage in off-peak times.

关键词： Hydrogen Liquefaction absorption refrigeration Waste treatment Mixed-refrigerant Ortho-para conversion

Measurement and Prediction of Vapor Pressure for H20 ＋ CHaOH] C2HsOH ＋ [BMIM][DBP] Ternary Working Fluids

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Chinese Journal of Chemical Engineering 2013年第8期21卷 886-893页

作者：张晓冬胡大鹏赵宗昌 School of Chemical Machinery Dalian University of Technology School of Chemical Engineering Dalian University of Technology

The ionic liquid, 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP]) was prepared and the vapor pressures of three set of binary solutions H2O(1)/CH3OH(1)/C2H5OH(1) + [BMIM][DBP](2) were measured at different temperature and in the ILs mole fraction range from 0.1 to 0.6 with a static equilibrium apparatus. The measured vapor pressures were correlated with Non-Random Two Liquid (NRTL) activity coefficient model and the average relative deviations (ARD) between experimental and correlated vapor pressures for these binary solutions were 3.19%, 2.42% and 2.95%, respectively. Then, the vapor pressures of two set of ternary solutions H2O(1) + CH3OH(2)/C2H5OH(2) + [BMIM][DBP](3) were measured with an inclined boiling apparatus and further predicted with NRTL activity coefficient model based on the binary interaction parameters coming from fitting the vapor pressures of the binary solutions. The results indicated that the ternary solutions containing [BMIM][DBP] were shown a strong negative deviation from Raoult's Law when the mole fraction of [BMIM][DBP] was larger than 0.2, which meant that ternary solutions could absorb the refrigerant vapors at the same or below solution temperature. Meanwhile, the average relative deviations between experimental and predicted vapor pressures for ternary solutions were 2.92% and 3.06%, respectively. Consequently, the NRTL active coefficient model used for non-electrolyte solutions was still valid for predicting vapor-liquid equilibrium of binary or ternary solutions containing ILs.

关键词： ionic liquid ternary working fluids vapor pressure NRTL model absorption refrigeration

Theoretical and Experimental Study of a Cylindro-Parabolic Solar Collector

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Journal of Environmental Science and Engineering 2011年第8期5卷 1026-1030页

作者： Y. Boukhchana A. Fellah A. Ben Brahim Engineers National School University of Gabes Gabes 6072 Tunisia

This article outlines the theoretical and experimental performance studies of a cylindro-parabolic solar collector. The theoretical study consists on the establishment, through mass and energy balances, of a mathematical model to control the exiting temperature of the heating fluid as well as the temperatures of the absorber and the glass. The experimental level investigates the influence of the solar absorber tube diameter on the performances of the driving device. Several experiments were made in order to know the possibility to reach temperatures being able to ensure for example the ammonia vaporization in the generator of a solar absorption refrigeration system. These experiments were carried out under various operating and climatic conditions. The results are presented and discussed.

关键词： Solar energy experimentation absorption refrigeration solar collector.