|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 不可逆过程广义热力学动态优化研究进展显示文摘广义热力学优化理论是热科学与技术领域的研究热点之一.本文首先回顾了有限时间热力学、熵产生最小化理论、理论、广义热力学优化理论的产生与发展,深入剖析了上述热学优化理论的物理内涵及其相互间异同点,然后从传热过程、传质过程、电容器充电电路和经济贸易过程等不可逆过程动态优化研究方面介绍了广义热力学优化理论的研究进展,重点比较了熵产生最小化理论和理论在传热传质过程优化中的异同点,最后指出除在研究对象范围和研究内容方面进一步拓展与细化外,追求物理模型的统一性、优化方法的通用性和优化结果的普适性是广义热力学优化理论的另一重要发展趋势. | 陈林根 夏少军 | 2019 | 中国科学:技术科学2019，49，9： | 35 |
| 2 | Work entransy and its applications显示文摘The entransy theory has been applied to the analyses of heat-work conversion systems. The physical meaning and the applications of work entransy are analyzed and discussed in this paper. Work entransy, which is clarified to be a process dependent quantity, is not the entransy of work, but the system entransy change accompanying work transfer. The relationship between the work entransy and the output work is set up. When the application preconditions are satisfied, larger work entransy leads to larger output work. Entransy loss, which was proposed and applied to heat work conversion processes with irreversible heat transfer, is the net entransy flow into the system and the summation of work entransy and entransy dissipation. The application preconditions of entransy loss are also discussed. | CHENG XueTao LIANG XinGang | 2015 | Science China(Technological Sciences)2015，58，12： | 14 |
| 3 | Power output analyses and optimizations of the Stirling cycle显示文摘Based on the finite time thermodynamics theory,the entransy theory and the entropy theory,the Stirling cycles under different conditions are analyzed and optimized with the maximum output power as the target in this paper.The applicability of entransy loss(EL),entransy dissipation(ED),entropy generation(EG),entropy generation number(EGN) and modified entropy generation number(MEGN) to the system optimization is investigated.The results show that the maximum EL rate corresponds to the maximum power output of the cycle working under the infinite heat reservoirs whose temperatures are prescribed,while the minimum EG rate and the extremum ED rate do not.For the Stirling cycle working under the finite heat reservoirs provided by the hot and cold streams whose inlet temperatures and the heat capacity flow rates are prescribed,the maximum EL rate,the minimum EG rate,the minimum EGN and the minimum MEGN all correspond to the maximum power output,but the extremum ED rate does not.When the heat capacity flow rate of the hot stream increases,the power output,the EL rate,the EG rate and the ED rate increase monotonously,while the EGN and the MEGN decrease first and then increase.The EL has best consistency in the power output optimizations of the Stirling cycles discussed in this paper. | ZHOU Bing CHENG XueTao LIANG XinGang | 2013 | Science China(Technological Sciences)2013，56，1： | 12 |
| 4 | Entransy and entropy analyses of heat pump systems显示文摘In this paper,heat pump systems are analyzed with entransy increase and entropy generation.The extremum entransy increase principle is developed.When the equivalent temperatures of the high and low temperature heat sources are fixed,the theoretical analyses and numerical results both show that the maximum COP leads to the maximum entransy increase rate for fixed input power,while it leads to the minimum entransy increase rate for fixed heat flow absorbed from the low temperature heat source.The minimum entropy generation principle shows that the minimum entropy generation rate always leads to the maximum COP for fixed input power or fixed heat flow absorbed from the low temperature heat source when the equivalent thermodynamic forces of the high and low temperature heat sources are given.Further discussions show that only the entransy increase rate always increases with increasing heat flow rate into the high temperature heat source for the discussed cases. | CHENG XueTao LIANG XinGang | 2013 | Chinese Science Bulletin2013，58，36： | 10 |
| 5 | Entransy and Exergy Analyses for Optimizations of Heat-Work Conversion with Carnot Cycle显示文摘The concept of entransy has been newly proposed in terms of the analogy between heat and electrical conduction and could be useful in analyzing and optimizing the heat-work conversion systems.This work presents comparative analyses of entransy and exergy for optimizations of heat-work conversion.The work production and heat transfer processes in Carnot cycle system are investigated with the formulations of exergy destruction,entransy loss,work entransy,entransy dissipation,and efficiencies for both cases of dumping and non-dumping of used source fluid.The effects of source and condensation temperatures on the system performance are systematically investigated for optimal condition of producing maximum work or work entransy. | Chul Ho Han Kyoung Hoon Kim | 2016 | Journal of Thermal Science2016，25，3： | 10 |
| 6 | T-Q diagram analyses and entransy optimization of the organic flash cycle(OFC)显示文摘The electrical power generation from low temperature heat source attracts more and more attentions but the temperature mismatching between the heat sources and working medium in the organic Rankine cycle(ORC)becomes an issue.The organic flash cycle(OFC)is an effective solution to this issue.In this paper,the OFC is analyzed by the concept of entransy loss and the T-Q(temperature-heat flow rate)diagram for the heat-work conversion.The equations for cycles of the basic OFC and the OFC whose heat source is the exhaust gas of the turbine in a Brayton cycle(the combined cycle)are derived theoretically and the results indicate that larger entransy loss rate leads to larger output power with prescribed inlet parameters of the hot stream in the discussed cases,which is displayed by the T-Qdiagram intuitively.Two numerical examples demonstrate that the optimal mass flow rate of the working medium for the maximum entransy loss rate is the same as that for the maximum output power.The T-Qdiagram analyses is in accordance with the numerical results.The concept of entransy loss can be used as the criteria for the OFC optimization. | WANG Wen Hua CHENG Xue Tao LIANG Xin Gang | 2015 | Science China(Technological Sciences)2015，58，4： | 7 |
| 7 | Entransy analyses of the thermodynamic cycle in a turbojet engine显示文摘The analysis and the design of turbojet engines are of great importance to the improvement of the system performance.Many researchers focus on these topics,and many important and interesting results have been obtained.In this paper,the thermodynamic cycle in a turbojet engine is analyzed with the entransy theory and the T-Q diagram.The ideal thermodynamic cycle in which there is no inner irreversibility is analyzed,as well as the influences from some inner irreversible factors,such as the heat transfer process,the change of the component of the working fluid and the viscosity of the working fluid.For the discussed cases,it is shown that larger entransy loss rate always results in larger output power,while smaller entropy generation rate does not always.The corresponding T-Q diagrams are also presented,with which the change tendencies of the entransy loss rate and the output power can be shown very intuitively.It is shown that the entransy theory is applicable for analyzing the inner irreversible thermodynamic cycles discussed in this paper.Compared with the concept of entropy generation,the concept of entransy loss and the corresponding T-Q diagram are more suitable for describing the change of the output power of the analyzed turbojet engine no matter if the inner irreversible factors are considered. | CHENG XueTao LIANG XinGang | 2017 | Science China(Technological Sciences)2017，60，8： | 7 |
| 8 | Analyses of thermodynamic performance for the endoreversible Otto cycle with the concepts of entropy generation and entransy显示文摘In this paper,power the the and endoreversible the Otto cycle is analyzed with the entropy generation minimization objectives,and the the entransy theory.of The output power,the heat-work conversion efficiency are taken as the optimization rate,and relationships the output heat-work conversion efficiency,entransy the entropy generation and the entropy generation rate numbers,the work entransy are loss rate,The entransy loss of coefficient,the dissipation rate the entransy variation associated with discussed.applicability entropy the entropy generation minimization and the entransy theory while to the analyses is also analyzed.It is found do that smaller generation rate does not always lead to larger output our power,smaller entropy entransy generation loss numbers and not always lead to larger heat-work conversion efficiency,either.larger the In calculations,power,both larger larger rate larger entransy variation heat-work rate associated with work correspond also to that output while entransy is loss coefficient suitable results the in larger conversion developed efficiency.It is found concept of entransy dissipation not always for analyses because it was for heat transfer. | WU YanQiu | 2017 | Science China(Technological Sciences)2017，60，5： | 7 |
| 9 | 基于(火积)耗散理论的新翼型换热器优化方法研究显示文摘基于(火积)的分布匹配以协同强化的思路对新翼型换热器进行结构优化,提出两种不均匀的翅片分布结构,在给定热流边界条件下以超临界CO2为工质,对多种翼形肋分布结构进行传热流动性能的数值研究.结果表明,针对超临界流体物性剧烈变化导致的换热参数分布极不均匀的特点,在总换热面积不变的条件下通过相应改变新翼型肋片分布方式,改善了流体(火积)与壁面热流(火积)的分布匹配性,进而改善了流道内局部(火积)耗散率的分布均匀性,使流道内总(火积)耗散率减小,换热性能提高.比拟两流体耦合换热过程中变热流边界条件下的数值研究表明,在换热器两流体耦合换热中依据换热参数分布特性相应改变新翼型肋的分布方式,在总换热面积不变的条件下同样改善冷热流体(火积)的分布匹配性,进而使局部(火积)耗散率沿换热区域分布更为均匀,减小总的(火积)耗散率.(火积)的分布匹配原则为换热器结构优化和改进提供了新的思路和方法,具有重要的理论和工程意义. | 韩增孝 郭江峰 淮秀兰 | 2021 | 中国科学:技术科学2021，51，10： | 4 |
| 10 | 煅损失的构成及其应用分析显示文摘(火积)损失是热力学过程中系统(火积)的减少量,它等于流入系统的(火积)流与流出系统的(火积)流之差,也等于(火积)耗散和功(火积)之和。对于传热过程,(火积)损失即为(火积)耗散,为(火积)损失的不可逆部分,反映了热力学第二定律。对于卡诺循环,(火积)损失即为功(火积),具有可逆特性,体现了热力学第一定律。对于包括传热过程和热功转换过程的系统,(火积)损失即包括(火积)耗散也包含功(火积)。(火积)损失的各个组成部分可以通过以热流和温度为横、纵坐标的T-q图上的面积描述。(火积)损失可应用于包含热功转换的过程以优化系统输出功,算例表明在一定条件下最大输出功率和最大(火积)损失率相对应。 | 孙晨 程雪涛 梁新刚 | 2013 | 工程热物理学报2013，34，5： | 3 |
| 11 | 基于广义传热定律的斯特林循环熵产分析和■分析显示文摘基于广义传热定律,本文将■理论和熵产最小化理论应用于有限热容热源下的斯特林循环的优化分析,以系统输出功和热效率为分析对象,讨论了■损失率、功引起的■变化率、■耗散率、■损失系数、熵产率、熵产数和改进熵产数等参数在优化分析中的适用性.本文主要讨论了3种不同的工况.研究表明,在这3种不同的工况下,■损失率和功引起的■变化率始终随着输出功率的增加而增加,■损失系数也一直随热效率增大而增大;然而,■耗散率的增大或熵产率的减小并不总是使得输出功率增大,同时,熵产数和改进熵产数也并不总随热效率的增大而减小.可见,对本文讨论的3种工况而言,■损失率、功引起的■变化率以及■损失系数这3个概念是适用的,其他参数则并不总是适用.基于上述分析结果,本文还对关于■理论的争议进行了简要的讨论,分析了某些负面评论存在的主要问题,如篡改原文、逻辑不一致、简单重复学术观点、重新命名关键概念甚至人身攻击等.这些■理论的负面评论并不属于真正的学术讨论,需要加以注意;本文的研究结果在一定程度上也可作为对部分负面评论的回应. | 吴艳秋 蔡黎 伍习丽 | 2019 | 中国科学:技术科学2019，49，6： | 3 |
| 12 | 闭口系统的间接做功能力及其度量显示文摘本文将系统对外做功的方式分为间接和直接做功两类,并对这两类做功过程进行了分析和讨论.对于间接做功过程,(火积)可以描述系统做功能力的变化,并可用于这一类做功过程的分析与优化,而熵产最小化方法并不总适用.然而,现有(火积)理论不能用于描述系统直接做功能力. | 程雪涛 梁新刚 | 2013 | 中国科学:技术科学2013，43，8： | 3 |
| 13 | An area method for visualizing heat-transfer imperfection of a heat exchanger network in terms of temperature–heat-flow-rate diagrams显示文摘The identification of the imperfection originating from finite-temperature-difference heat transfer is an indispensable step for both the performance analysis and the better design of a heat exchanger network(HEN) with the aim of energy saving. This study develops a convenient area method for visualizing the heat-transfer imperfection of a HEN in terms of temperature–heat flow diagrams( T-Q diagrams) by combining the composite curves that have already been used in pinch analysis and the recently developed entransy analysis. It is shown that the area between the hot and cold composite curves and the hot and cold utility lines on a T-Q diagram is just equal to the total entransy dissipation rate during the multi-stream heat transfer process occurred in a HEN, and this area can be used to graphically represent the total heat-transfer imperfection of the HEN. The increase in heat recovery or decrease in energy requirements with decreasing the minimum temperature difference, ΔT_(min), of a HEN can then be attributed to a lower entransy dissipation rate, quantitatively represented by the decrease of the area between the composite curves and the utility lines. In addition, the differences between the T-Q diagram and the pre-existing energy level–enthalpy flow diagram(Ω-H diagram) in the roles of visualizing process imperfection and designing HENs are discussed. | WU Jing YANG XianPei | 2016 | Science China(Technological Sciences)2016，59，10： | 2 |
| 14 | 基于可拓理论和熵权的钻井作业风险评价模型研究与应用显示文摘从'人-物-环-管'入手,深入分析钻井作业的各个风险影响因素,划分风险等级并构建风险评价指标体系,引入可拓理论建立可拓评价关联函数计算指标与风险等级的综合关联度,并利用熵权法计算各指标的权重,将两者结合,最终评价钻井作业的风险等级。 | 颜丽敏 | 2018 | 安全、健康和环境2018，18，10： | 1 |
| 15 | (火积)损失极值原理在热源塔热泵系统优化运行中的应用显示文摘为优化热源塔热泵系统的运行,基于火积理论,提出热源塔热泵系统火积损失极值原理,并构建热源塔热泵系统火积损失模型。通过模拟和实验分别研究在定系统供热量和定系统输入功率时,系统在不同运行工况下的火积损失率,得出系统的最优运行工况。研究结果表明:系统火积损失率实验值与模拟值的相对误差不超过9.8%,表明系统火积损失模型具有较高的精度;当系统供热量为4 k W时,最优运行工况为压缩机频率51 Hz,热水流量0.5 kg/s,溶液流量0.6 kg/s,风量1.4 kg/s,此时系统火积损失率最大,系统输入功率最小,系统效率最高;当系统输入功率为2 k W时,最优运行工况为压缩机频率72 Hz,热水流量0.4 kg/s,溶液流量0.5 kg/s,风量1.6 kg/s,系统火积损失率最小,系统供热量最大,系统效率最高。 | 林涛 梁彩华 郜骅 张小松 | 2017 | 中南大学学报(自然科学版)2017，48，10： | 1 |
| 16 | [火积]分析在空调系统运行优化中的可行性研究显示文摘为优化空调系统运行,基于(火积)理论,本文提出空调系统(火积)增加极值原理,构建空调系统各部件(火积)损失率计算模型,并得到空调系统整体(火积)增加率计算模型。实验分别研究了在给定系统制冷量和给定系统输入功率条件下,空调系统在不同运行工况下的(火积)增加率,较好地验证了空调(火积)增加极值原理,并得到了空调系统最佳运行工况。结果表明:当系统制冷量为5 k W时,最佳运行工况为压缩机频率70 Hz,冷冻水流量0.6 kg/s,冷却水流量0.9 kg/s;当系统输入功率为2.8 k W时,最佳运行工况为压缩机频率97.9 Hz,冷冻水流量0.41 kg/s,冷却水流量1.00 kg/s。 | 黄婷婷 梁彩华 张小松 | 2018 | 制冷学报2018，39，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员