热电制冷器多通道内空气混合对流及耦合换热

建立了热电制冷器通风及耦合换热数学和物理模型,模拟计算了不同雷诺数、材料有效导热系数比率、几何参数时各通道的流体流动及温度场分布情况,分析了冷风侧排风、几何参数对通道换热能力的影响,以优化制冷器通风换热风道的设计参数。     

变温热源不可逆制冷机分析

利用有限时间热力学分析了变温热源制冷循环性能，计入了工质与高低温侧换热器的热阻损失，热源之间的热漏损失及工质内部耗散的不可逆损失。在给定制冷率条件下，推导出最大性能系数和高低温侧循环工质温度的解析式，通过数值计算，分析了各不可逆损失对循环性能的影响。     

我国干法熄焦技术发展与应用

论述了我国干法熄焦技术装备的发展状况、工艺流程、技术特点、节能减排效益、经济效益。     

Investigations for performance enhancement of dual pressure HRSG in gas/steam combined cycle power plants

A heat recovery steam generator (HRSG) is the vital equipment in a gas/steam combined cycle power plant (CCPP) which plays an important role in enhancing the overall performance of the plant. An HRSG is designed on the basis of the size of the gas and steam turbines used in the power plant. Therefore, the HRSG directly affects the performance of the CCPP and its optimisation based on physical design can improve the plant performance. In the present study, the plant data of the CCPP of NTPC Ltd. at Auraiya (U.P.), India, has been considered for study. A segmented finned model has been chosen as it is the preferred arrangement [Ganapathy, V. 2003. Industrial Boiler and Heat Recovery Steam Generator Design, Application and Calculation. New York: Marcel Dekker Inc.] and thermodynamic investigations have been carried out upon a dual pressure HRSG in a gas/steam CCPP from the perspective of maximum heat recovery and minimum pressure loss. The performance investigations of varying physical parameters of a dual pressure HRSG with segmented fins are useful for CCPP designers and for all those who are engaged in the area of heat recovery.     

Applications of ground source heat pump systems in different temperature zones in China

An analysis of the application of ground source heat pump (GSHP) systems to different temperature zones in China is presented in this paper. According to the climate characteristics, China is divided into six different temperature zones: the tropical zone, the subtropical zone, the warm temperate zone, the mid temperate zone, the cold temperate zone, and Qinghai-Tibet Plateau vertical temperature zone. Six representative cities corresponding to the six temperature zones are chosen and their different climate and soil characteristics are studied. The results show that a GSHP system can be applied to the first four temperature zones above, but not the cold temperate zone and the Qinghai-Tibet Plateau vertical temperature zone. However, in different temperature zones, different GSHP systems should be designed and built.     

燃气机热泵系统不同联供运行模式一次能源利用率的分析

分析了燃气机热泵热电冷三联供系统节能的热力学原理及应用优势,探讨了不同季节采用不同的联供运行模式一次能源利用率PER的情况,并就影响PER的主要因素——废热回收率、热泵性能系数及用于发电的燃气能量占燃气总能量的比例的变动效应进行了模拟计算,给出了燃气机热泵不同联供运行工况下PER的对比及规律。     

考虑不同温度-应力路径及复杂温度分布状态下的钢结构火灾非线性分析

采用考虑温度-应力路径影响的高温下钢材的应力-应变关系,并考虑构件截面上温度非线性的分布状况,对火灾中钢结构的反应进行非线性分析,旨在尝试提出一种更加符合实际情况的钢结构抗火分析新方法。根据已有的试验结果,对高温材性试验数据进行了回归分析,得到Q235钢在升温恒载、升温加载、升温降载3种基本温度-应力路径的本构关系式。根据有限元原理,提出截面上温度分布的瞬态分析方法,并与欧洲规范、SAFIR程序进行对照,验证其正确性,为结构抗火全过程分析提供了理论基础。     

热力地沟衬砌温度应力的材料热力学参数确定

根据热传导理论，在考虑了地沟内温度分布的各种影响因素下，介绍了确定空气与混凝土及空气与土壤问的对流换热系数的研究方法，为在今后的工程设计中进行内外壁温度差产生的温度应力的计算提供借鉴。