检索结果-南通市图书馆

Thermal performance evaluation of subcritical organic rankine cycle for waste heat recovery from sinter annular cooler

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第3期27卷 248-258页

作者： Jun-sheng Feng Guang-tao Gao Yousef NDabwan Gang Pei Hui Dong School of Environment and Energy Engineering Anhui Jianzhu UniversityHefei 230026AnhuiChina School of Engineering and Science University of Science and Technology of ChinaHefei 230026AnhuiChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The sinter cooling flue gas expelled from the end of an annular cooler was taken as the heat source of an organic rankine cycle(ORC)system,and R123,R245fa,R600,R601 and R601a were selected as the working fluids of the ORC *** effects of evaporation temperature and superheat degree of working fluid,as well as the pinch point temperature difference in the evaporator on the system thermal performance,were analyzed in *** results show that the system net output power and exergy efficiency for different working fluids first increase and then decrease with an increase in the evaporation temperature and decrease with an increase in the superheat degree and pinch point temperature *** change in pinch point temperature difference has no effect on the system thermal *** a given operational condition,the system thermal efficiency and exergy efficiency of R 123 are the maximum,while the system total irreversible loss of R245fa is the *** the evaporation temperature is greater than 110°C,the system net output power of R600 is the *** ORC system could obtain the maximum net output power and exergy efficiency through the adjustment of evaporation temperature of working fluid.

关键词： Sinter Waste heat recovery Organic rankine cycle Fluid selection Performance evaluation

Carbon Dioxide as Working Fluids in Transcritical rankine Cycle for Diesel Engine Multiple Waste Heat Recovery in Comparison to Hydrocarbons

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2019年第3期28卷 494-504页

作者： LIU Peng SHU Gequn TIAN Hua State Key Laboratory of Engines Tianjin University

In consideration of the high-temperature characteristic of engine's waste heat and stricter environmental regulations, natural substance, including CO_2 and hydrocarbons, have been treated as promising working fluid for diesel engine waste heat recovery due to its environment friendly and excellent physical and chemical properties. This paper presented a comprehensive performance analysis on transcritical rankine cycles for diesel engine multiple waste heat recovery using hydrocarbons and CO_2 as working fluid. The optimal turbine inlet pressures corresponding to maximum net power output, maximum exergy efficiency and minimum electricity production cost(EPC) were obtained. The effect of working fluid on these optimal pressures has been discussed. For fluids with low critical temperature, the optimal pressure corresponding to maximum net power output is lower than the one for maximum exergy efficiency, while the opposite results can be found for fluid with high critical temperature. Then, the effect of various working fluid properties in transcritical cycle performance is discussed. Comparison results show that CO_2 obtains only more power output than Ethane, Propane and Propene, but CO_2 is capable of absorbing more energy from engine coolant and regeneration heat with comparable total heat transfer areas and has an advantage in turbine size, particularly for hydrocarbons with high critical temperature.

关键词： transcritical rankine cycle natural working fluid multiple waste heat performance comparison

Thermodynamic optimization and fluid selection of organic rankine cycle driven by a latent heat source

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2017年第12期24卷 2829-2841页

作者： XU Peng LU Jian LI Tai-lu ZHU Jia-ling School of Energy and Safety Engineering Tianjin Chengjian University Tianjin 300384 China Key Laboratory of Efficient Utilization of Low and Medium Grade Energy Ministry of Education(Tianjin University) Tianjin 300072 China

Organic rankine cycle(ORC) is applicable for the heat-work conversion. Whereas, there also exist a lot issues that influence the efficiency and the cost of the system. In this work, eleven pure working fluids(as categorized into alkanes, and fluorinated alkanes) are investigated based on the first and second law of thermodynamics. The major objective is to obtain the most suitable working fluid for the latent heat source. The results show that the working fluid is an important factor of the system performance. The heat absorption of the working fluid in the evaporator is inversely proportional to the evaporating temperature, but the thermal and exergetic efficiencies are just the opposite. RC318 has the highest net power output and the lowest outlet temperature of the heat source, but its global warming potential(GWP) value is too high. The cyclohexane shows the highest thermal efficiency among the fluids investigated. Moreover, the figure of merit(FOM) of the isobutane is higher than that of other working fluids. Overall, the cyclohexane shows that the optimal comprehensive performance is more feasible for medium grade heat source in engineering applications.

关键词： organic rankine cycle working fluids thermodynamics low-temperature evaporating temperature

DETERMINATION OF THE OPTIMAL rankine CYCLE FOR WASTE HEAT RECOVERY

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 1997年第3期5卷 66-72页

作者：冯霄 Thore Berntsson Department of Chemical Engineering Xi'an Jiaotong University Department of Heat and Power Technology Chalmers University of Technology

In this paper,the optimal rankine Cycle for waste heat recovery is considered after pro-cess *** exergetic efficiency is used to measure the thermodynamic performance of the re-covery *** with recovering a single waste heat stream,heat recovery after processintegration is much more complicated due to the changeable specific heat given by the process grandcomposite ***,this paper attempts to focus attention on the influence of grand compos-ite curves on the optimization.

关键词： waste heat recovery rankine cycle process integration

Performance Analysis of a Multistage Centrifugal Pump Used in an Organic rankine Cycle(ORC) System under Various Condensation Conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2019年第4期28卷 621-634页

作者： YANG Yuxin ZHANG Hongguang TIAN Guohong XU Yonghong WANG Chongyao GAO Jianbing College of Environmental and Energy Engineering MOE (Ministry of Education) Key Laboratory of Enhanced Heat Transfer and Energy ConservationBeijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100124China Department of Mechanical Engineering Sciences University of SurreyGuildford GUI 2LJUK School of Electrical and Mechanical Engineering Beijing Information Science and Technology UniversityBeijing 100192China

In an organic rankine cycle(ORC)system,the working fluid pump plays an important role in the system *** paper focused on the operating characteristics of a multistage centrifugal pump at various speeds and condensation *** experimental investigation was carried out to assess the influence of the performance of the pump by the ORC system with special attention to actual net power output,thermal efficiency as well as back work ratio(BWR).The results showed that an increase in the pump speed led to an increase in the mass flow rate and expand in the operating range of the outlet *** mass flow rate decreased nonlinearly with the increase of the outlet pressure from 0.22 to 2.41 MPa;the electric power consumption changed between 151.54 and 2409.34 W and the mechanical efficiency of the pump changed from 7.90%to 61.88%when the pump speed varied from 1160 to 2900 r/***,at lower pump specific speed the ORC system achieved higher thermal efficiency,which suggested that an ultra-low specific speed pump was a promising candidate for an ORC *** results also suggested that the effects of condensation conditions on the pump performance decreased with the pump speed increasing and BWR was relatively sensitive to the condensation conditions,especially at low pump speed.

关键词： waste heat recovery organic rankine cycle multistage centrifugal pump operating characteristics various condensation conditions back work ratio(BWR)

Shift-characteristics and bounds of thermal performance of organic rankine cycle based on trapezoidal model

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2018年第12期61卷 1802-1813页

作者： LI XinGuo WANG JingYi WU XiaoSong School of Mechanical Engineering Tianjin University Key Laboratory of Efficient Utilization of Low and Medium Grade Energy

In consideration of the constraints of actual working fluids on theoretical study of organic rankine cycle(ORC), a trapezoidal cycle(TPC) with theoretical model to simulate ORC was proposed in previous works. In this study, mathematical models of working fluids including model of simulated saturation curve(MSSC) and model of linear saturation lines(MLSL) are proposed and built. Combining mathematical models of working fluids and TPC, the thermodynamic characteristics and principles of TPC(or ORC) can be studied or predicted theoretically. There exists a shift-curve of net power output with corresponding shifttemperature of heating fluid for working fluids, which indicates the shift of net power output from having optimum condition of maximum power to monotonic increase with evaporation temperature. This shift-characteristic is significant to working fluid selection and evaluation of cycle performance, for it indicates that cycle without optimum condition can yield higher net power output than the cycle with optimum condition. Equations to calculate the shift-temperature in ORC(or TPC) are derived; and equations to calculate the highest optimal evaporation temperature and highest maximum power as the highest optimum condition at this shift-temperature are obtained. Based on TPC and its theoretical model, the lower and upper bounds of thermal performance(maximum power and corresponding thermal efficiency) of TPC(or ORC) can be demonstrated and acquired. TPC can develop to Carnot cycle or trilateral cycle that it is significant to use TPC as a generalized cycle to study the general principles and characteristics of the cycles.

关键词： organic rankine cycle (ORC) trapezoidal cycle (TPC) mathematical models of working fluids shift-temperature of heating fluid for working fluid bounds of thermal performance

Selection and Evaluation of Dry and Isentropic Organic Working Fluids Used in Organic rankine Cycle Based on the Turning Point on Their Saturated Vapor Curves

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2019年第4期28卷 643-658页

作者： ZHANG Xinxin ZHANG Congtian HE Maogang WANG Jingfu MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Heat Transfer and Energy Conversion College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi’an 710049China

The organic rankine cycle(ORC)is a popular technique used in the utilization of low-grade thermal *** wet,dry,and isentropic organic working fluids,the latter two types are more appropriate for ORC *** this paper,the definition of turning point on saturated vapor curve of dry fluid and isentropic fluid was given according to the shape of the saturated curve of working fluids in a T-s *** this basis,the model of near-critical region triangle was *** this model,the thermodynamic performance of 57 kinds of dry and isentropic organic working fluids in ORC was *** performance includes the relation between turning point temperature and cycle thermal efficiency,the relation between near-critical region triangle area and cycle thermal efficiency,the relation between near-critical region triangle area and exergy at turning point temperature,the relation between near-critical region triangle area and reciprocal value of slope of saturated vapor ***,working fluid selection was also conducted in terms of heat source *** was found through theoretical analysis results that the popular R123 is an acceptable choice especially for the utilization of closed type heat *** it will be phased out in near future,then cis-butene,butane,trans-butene,and isobutene are worth studying as its *** is worthy of attention and further research and it can be a good choice for utilization of open type heat source.

关键词： dry fluid isentropic fluid turning point saturated vapor curve near-critical region triangle Organic rankine Cycle

Study on the Performance of Organic rankine Cycle-Heat Pump(ORC-HP) Combined System Powered by Diesel Engine Exhaust

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2019年第5期28卷 1065-1077页

作者： ZHAO Tenglong YU Fei ZHANG Hongguang WU Yuting WANG Yan College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 China MOE(Ministry of Education)Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy Conversion Beijing University of Technology Beijing 100124 China

This study presents an ORC-HP combined system driven by diesel engine exhaust. This paper focuses on the feasibility and performance of the combined system under heating mode to heat a coach. The performances of the combined system with different parameters, including condensation temperature and evaporation pressure in ORC system, gas cooler outlet pressure, gas cooler outlet temperature and evaporation temperature in HP system, have been analyzed. The results show that the combined system can fully meet the demand of heat production. The optimal flow division ratio(rp) of 0.32 is selected by analyzing the system performance. Low condensation temperature is beneficial to the combined system performance. There exists a suitable range of evaporation temperature, gas cooler outlet pressure and gas cooler outlet temperature to achieve excellent performance. The heating coefficient of performance(COP_h) shows a first increasing and then decreasing trend with gas cooler outlet pressure, namely there exists an optimal gas cooler outlet pressure that achieves the maximum COP_h. The maximum total efficiency, COP_h and heating capacity can reach up to 48.44%, 4.78 and 176.56 kW, respectively. These results show significant energy savings by applying the ORC-HP combined system.

关键词： organic rankine cycle heat pump combined system total efficiency COPh

Finite Water Depth Effect on Wave-Body Problems Solved by rankine Source Method

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2017年第2期16卷 191-199页

作者： FENG Aichun TANG Peng YOU Yunxiang LIU Kaizhou Department of Civil and Environmental Engineering National University of Singapore College of Ocean Science and Engineering Shanghai Maritime University School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong University State key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of Science

Finite water depth effect for wave-body problems are studied by continuous rankine source method and non-desingularized *** surface and seabed surface profiles are represented by continuous panels rather than a discretization by isolated *** panels are positioned exactly on the fluid boundary surfaces and therefore no desingularization technique is *** increment method is applied for both free surface source and seabed source arrangements to reduce computational cost and improve numerical *** order Runge-Kutta iteration scheme is adopted on the free surface updating at every time *** finite water depth effect is studied quantitatively for a series of cylinders with different B/T *** accuracy and efficiency of the proposed model are validated by comparison with published numerical results and experimental *** results show that hydrodynamic coefficients vary for cylinder bodies with different ratios of B/*** certain set of B/T ratios the effect of finite water depth increases quickly with the increase of motion frequency and becomes stable when frequency is relatively *** also shows that water depths have larger hydrodynamic effects on cylinder with larger breadth to draft *** the heave added mass and damping coefficients increase across the frequency range with the water depths decrease for forced heave *** water depths have smaller effects on sway motion response than on heave motion response.

关键词： finite water depth rankine source method continuous source panel Runge-Kutta