循环理论

This paper discusses such design problems in heating systems with the pres- sureless boiler as how the pumping head of the cycle pump is selected ,where the cycle pump is installed and whether the expansion tank is necessary.

针对无压锅炉供暖系统设计中有关循环水泵扬程的选择、循环水泵的设置高度及是否设置膨胀水箱等问题从理论和实践上进行了探讨，得出了可供设计人员实际应用的计算公式，介绍了几个关键问题的处理方法，澄清了一些模糊认识。

On the basis of the molecular-field theory and thermodynamics of magnetic system, the relation between heat and magnetic entropy change of the regenerative room-temperature magnetic Ericsson refrigeration cycle was analyzed in our study.

结合分子场理论和磁系统热力学知识，分析了回热式室温磁Ericsson制冷循环中热量和磁熵的关系，重点研究了热源温度对铁磁质磁Ericsson制冷循环性能的影响。

On the basis of the molecular-field theory and thermodynamics of magnetic systemthe relation between heat and magnetic entropy change of the regenerative room-temperature magnetic Ericsson refrigeration cycle was analyzed in our study.

结合分子场理论和磁系统热力学知识，分析了回热式室温磁Ericsson制冷循环中热量和磁熵的关系，重点研究了热源温度对铁磁质磁Ericsson制冷循环性能的影响。

This dissertation aims to develop an overall mathematical model of circulating fluidized bed combustors on up-to-date theories and experimental data of previous research work.

本论文的主要目的是在理论研究和试验结果的基础上，发展循环流化床锅炉整体数学模型，为循环流化床锅炉的设计、优化运行提供可靠参数和信息指导。

The kinetic models of cyclic conversion and carbonation for the sorbents were developed to offer basic theory for reactor design.

建立了吸收剂的循环转化率模型以及循环碳酸化过程动力学模型，为反应器的设计提供理论依据。

On the basis of analyzing the thermodynamic properties and cycle performance of pure refrigerants, the paper optimizes their concentration while screening NARMs used in wide variable-temperature heat source. The practical applications of NARMs, such as R22/R123, R123/R125 etc., are studied in geothermal heat pump, seawater heat pump, air dehumidification system and dual-evaporator domestic refrigerator. The results show that the NARMs can match the limitation of a pinch point at the air-side exit of heat exchanger, reduce the unreasonable heat transfer temperature difference, and improve the COP of system. The above conclusion is proved by measuring the cycle performance of R12, MP39 and R11/R22 in a two-evaporator experimental system.

其次，本文在工质热物性和变工况循环性能分析基础上，筛选和优化了适应外部大变温热源约束条件的非共沸混合工质及其浓度配比；讨论了相变温差较大的非共沸混合工质（如R22/R123、R123/R125等）在地热源供热热泵、海水源供热热泵、双门冰箱和热泵空气除湿的应用，计算分析表明制冷与热泵系统采用相变温差较大的非共沸混合工质有利于弱化传热过程的&窄点&的约束，减小传热过程中的不合理温差，提高系统COP值；通过建立双蒸发温度循环系统试验装置，对R12、R22/R11和R22/R152a/R124循环性能进行实验研究，结果与理论分析一致。

Intermediate heat cycle can be reduced because the tail blade turbine steam humidity and reduce steam consumption. improve plant efficiency and thermal cycling in the unit were popular, however, Reheat temperature control system with nonlinear their targets, inertia, the characteristics of delay, Power Plant to become more difficult to control the system-paper fuzzy control theory and fuzzy logic, reconsidered conventional PID control law on the basis of the study and intelligent fuzzy PID control, the 300MW units Reheat fuzzy control process using adaptive PID control, the introduction of load feedforward. design configuration, the final design complex adaptive feedforward cascade control system and MATLAB for simulation, simulation results show that the response speed, Robust control and accuracy, the system has considerable advantages Unit to improve the efficiency and reduce the operational workload.

中间再热循环技术因其可以降低汽轮机尾部叶片的蒸汽湿度和降低汽耗，提高电厂的热循环效率而在单元机组中被普遍采用，然而，再热气温控制系统因其对象具有非线性，大惯性，大迟延等特点，成为火电厂较难控制的系统之－，本文运用模糊控制理论和模糊逻辑推理，在重新认识常规PID控制规律的基础上探讨了PID与智能模糊控制相结合，在电厂300MW发电机组再热模糊控制过程中使用自适应PID控制，引入负荷前馈，设计组态，最终设计出自适应复合型前馈串级控制系统，并在MATLAB中进行仿真模拟，仿真结果表明，在响应速度，鲁棒性和控制精度等方面，此系统都具有相当大的优越性，有利于提高机组的效率和减轻运行人员的劳动负荷。

The developed mathematical model and obtained dynamic characteristics of gas and steam combined cycle in this thesis is of great practical value and provides a theoretical foundation for its control system design.

本文对燃气蒸汽联合循环机组数学模型和动态特性的研究为其控制系统的设计提供了理论基础，所做工作对联合循环机组控制系统的设计具有重要的工程实用价值。

A new special economical experimental unit which applies to the R717 recurrence system of the screw compressor with the economizer has been designed and set up. The experiential results of the single stage recurrence and recurrence with the economizer, such as refrigerating capacity, shaft power, volumetric efficiency etc, under different conditions are got from the experiments. The author analyze and the calculate results of theory in this paper.

建立了独特节能的R717工质带经济器螺杆制冷循环系统的试验装置，通过对所研究压缩机的试验测试，得到了普通单级螺杆循环和带经济器螺杆循环在各种工况下的制冷量、轴功率、容积效率、相对补气量、中间压力等数据，并与了本文理论计算的结果进行了比较分析。

In additionthe Carnot model of the present system was established and its efficiency of the ideal cycle was obtained.

分析了吸收循环内部的能量转换，提出适合冷水大温差的改进的双蒸发器-双吸收器吸收循环系统，并建立了改进系统的卡诺模型，并推导出其理想循环的理论效率表达式。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。