The Effects of Mass Leak and Mass-transfer Irreversibility on the Cyclic Performance of the Chemical Pump

【中文文摘】建立不可逆化学泵循环模型,揭示质量传递不可逆性和质量漏对其性能的影响,导出循环的泵能率与性能系数间的优化关系,在此基础上进一步讨论循环的其它优化特性.所得结论可为质量交换器,电化学、光化学、固态设备及燃油泵等设备的优化设计提供新的理论指导. 【英文文摘】The model of an irreversible chemical pump is set up and the effects of mass-transfer irreversibility and mass leak on the performances of the chemical pump are revealed. The optimal relation between the coefficient of performance and the rate of energy pumping is derived. On the basis of the optimal relation, we discuss further other optimal performances for the cycle of the chemical pump. The results obtained here can provide some new theoretical bases for the optimal design of a class of apparatus such as mass exchangers , electrochemical , photochemical and solid - state device , as well as fuel pump and so on.泉州市科委科研基金资助项目(NO:Z200022

Parametric optimum design of an irreversible photon-enhanced thermionic emission solar cell hybrid system

考虑实际系统中存在的多种传热损失,本文建立一类不可逆光子增强热离子发射太阳能电池与温差热电发电器组合而成的混发电系统模型.基于太阳能电池与温差热电发电器之间的能量平衡方程,导出该混合系统输出功率和效率的表达式.通过数值计算,详细分析了光增热离子太阳能电池的面积、阴极半导体材料的禁带宽度、电子亲和势以及温差热电发电器的无量纲电流对混合系统优化性能的影响,确定混合发电系统运行于最大效率下光子增强热离子太阳能电池阴极材料的禁带宽度,电子亲和势,电池面积和温差热电发电器的无量纲电流的优化值.结果表明,采用混合发电系统,太阳能转换效率与工作于相同条件下的单一光增热离子太阳能电池的效率相比可提高约10%,而光增热离子太阳能电池阴极半导体材料禁带宽度在最大效率下的优化值则比单一光增热离子太阳能电池的小.本文所得结果可为实际光子增强热离子太阳能电池混合发电系统的设计和优化运行提供理论依据.A class of an irreversible thermodynamic model of the hybrid power system consisting of a photon-enhanced thermiomic emission solar cell(PETSC) and a thermoelectric generator(TEG) is established, in which some main irreversible losses existing real hybrid systems are taken into account. Based on equations of the energy balance between the solar cell and thermoelectric generator,expressions for the power output and efficiency of the hybrid system are derived. By using the numerical calculation, influences of the cell area, the energy band gap and electron affinity of the cathode semiconductor materials, and the dimensionless current of the generator on the optimal performance of the hybrid system are analyzed in detail. Under the operating condition of maximum efficiency, the optimal values of some important performance parameters of the hybrid system, such as the energy band gap, electron affinity, area and dimensionless current, are given. The results obtained in this paper show that by using the hybrid system, the solar energy conversion efficiency can be increased by about 10% and the optimal value of the energy band gap for the PESTC of the hybrid system at maximum efficiency is smaller than that of the energy band gap for alone operating PESTC. All the results obtained in this article will provide some theoretical basis for the design and optimal operation of practical PETSC hybrid system.国家自然科学基金(批准号:11175148,11305064);; 福建省自然科学基金(批准号:2011J01012);; 华侨大学引进人才科研启动资金(编号:09BS510)资助项

一种双天线发射分集方案的性能分析

在平坦的瑞利衰落信道中,通过分析一种简单的双发射天线分集方案(即Alamouti编码方案,简称ACS)接收信号的统计特性和输出信噪比。在多相相移键控调制下,推导了该方案的传输比特误码率的一般理论分析式,证明了采用ACS技术的移动通信系统与采用2分集阶的最大比率合并接收分集技术的误码性能相同。MonteCarlo仿真结果也验证此结论。这一理论成果可推广到采用正交空时分组码的多天线发射分集系统

The Effect of Multi-irreversibilities on Thermoeconomic Performance of a Heat Transformer

【中文文摘】基于一类不可逆三热源热变换器的循环模型,提出以每单位成本的泵热率作为热经济学目标函数,优化热变换器的各种性能参数.分析内不可逆性、热漏和经济参数对热变换器性能的影响,利用数值解计算热经济学目标函数的最大值及所对应的各种性能参数. 【英文文摘】The heating load per unit cost is taken as the thermoeconomic objective function with the cycle model of a class of irreversible three-heat-source heat transformers as the basis. The objective function is used to optimize the performance of the cycle. The effect of internal irreversibility, heat leak and economic parameter on the performance of the cycle is analyzed. The maximum thermoeconomic function and the corresponding performance parameters are obtained by using numerical calculation. The results obtained here provide some valuable guidance for the optimal design and operation of practical systems.国家自然科学基金资助项目(59976033

Reply to comment on 'Optimal design of a multi-couple thermoelectric generator'

The model used in the paper by Chen et al (2000 Semicond. Sci. Technol. 15 184-8) is general and useful and has been used by several authors to optimize the performance of thermoelectric generators. The content of the comment by Chen and Liao (2004 Semicond. Sci. Technol. 19 558) is incorrect

Optimal analysis of the performance of an irreversible quantum heat engine with spin systems

It is considered that the cycle of a quantum heat engine using many non-interacting spin-1/2 systems as the working substance is composed of two adiabatic and two isomagnetic field processes and is referred to as a spin quantum Brayton engine cycle. Based on the quantum master equation and semi-group approach, expressions for the efficiency and power output of the cycle are derived. By using numerical solutions, the power output of the heat engine subject to finite cycle duration is optimized. The maximum power output and the corresponding parameters are calculated numerically. The optimal region of the efficiency and the optimal ranges of temperatures of the working substance and times spent on the two isomagnetic field processes are determined, so that the general optimum performance characteristics of the cycle are revealed. Moreover, the optimal performance of the cycle in the high-temperature limit is also analysed in detail. The results obtained here are further generalized, so that they may be directly used to describe the performance of a quantum Brayton heat engine using spin-J systems as the working substance

Optimum performance analysis of a two-stage irreversible magnetization Brayton refrigeration system

A two-stage magnetization Brayton refrigeration cycle model using a paramagnetic material as the working substance is established, in which the regeneration and the irreversibility in the adiabatic processes are taken into account. On the basis of the thermodynamic properties of a paramagnetic material, the expressions of some important parameters such as the coefficient of performance, refrigeration load and work input are derived and used to analyse the performance characteristics of the refrigeration cycle. The influence of the inter-magnetization process, irreversibility in the adiabatic processes and regeneration on the performance of the cycle is discussed in detail. The advantage of adding the inter-magnetization process is expounded and the magnetic field ratio related to the inter-magnetization process is optimized. Moreover, the optimal values of the temperatures of the working substance at different state points and the optimally operating region of the cycle are determined. The results obtained here are compared with those derived from some relevant magnetic Brayton refrigeration cycles, and consequently, some significant conclusions are obtained

懐徳堂講座講演要旨

昭和60年春季【大阪の町々 : 歴史の舞台として】都出比呂志「上町台地のあけぼの : 原始時代の大阪」, 田中文英「天王寺と渡辺 : 中世の大阪」, 宮本又郎「船場」, 脇田修「道頓堀」, 本城正徳「堂島」, 梅渓昇「川口居留地 : 文明開化の大阪」昭和60年秋季【現代芸術の世界】神林恒道「抽象芸術は何をめざすか」, 岩城見一「新たな自然を求めて : オブジェの問題」, 出川哲朗「記号化する現代と芸術」, 源高根「大衆化する芸術のなかで : 小説と映画の場合」, 太田喬夫「ポップ・アート : 俗物の芸術」, 潮江宏三「工業化時代の技術と芸術

多発性硬化症と診断され性格的問題も多い患者の社会復帰をめざしての働きかけを試みて

Article信州大学医学部附属病院看護研究集録 1975: 45-50 (1975)departmental bulletin pape

学校教育・社会教育における地理情報システムの利用に関する研究

伊藤 悟(研究代表者)「学校教育・社会教育における地理情報システムの利用に関する研究」研究成果報告書 (課題番号: 16300295, 研究期間: 2004 – 2007)金沢大学名誉教授research repor