Slow cooling section is next the fast cooling section , cooling tiles slowly by exchange heat between hot gas in the tunnel and the environment air , which is sucked into pipes stick in the tunnel and been heated there , and been sent to dryer to dry biscuits 缓冷段不直接打冷却风，它通过抽热风机将环境空气吸入,进入窑内导热良好的钢管，并将换热后的热空气送入干燥窑内,冷空气在换热过程中，使制品得到间接的冷却，让制品安全度过573的晶型转换阶段。
On the basis of the constitution and work principle of general drum brake and the heat transfer theory , the friction heat , the heat convection and the radiation recuperation of drum brake are analyzed detailed , and then the mathematics model of temperature rise calculation is built 在对目前常用的鼓式制动器结构和工作原理进行分析的基础上，结合传热学的理论知识，详细研究了鼓式制动器的摩擦生热过程、辐射换热过程和对流换热过程，建立了其温升计算的数学模型。
In this paper , recent development of condensation heat transfer of alternative refrigerants inside tubes are reviewed , including the comparison of heat transfer characteristics between alternative refrigerants and original refrigerants , the influence of lubricants on heat transfer and the enhancement of condensation heat transfer 本文回顾了国内外替代制冷剂管内冷凝换热方面的研究进展，包括各种替代制冷剂与原制冷剂的传热性能对比、润滑油对传热的影响、冷凝换热过程的强化。
Secondly , the temperature distribution in rib - tube heat exchanger in the course of heat transfer is programed and simulated using apdl language of fem software ansys , and the average convection coefficient of both sides is obtained . the rib - tubes with different structure are also simulated and optimized on the base of the calculated results , the relationship between structure and the average convection coefficient of both sides is summrized . the rib - tube structure is optimized using apdl . finally , combines numerical simulation with experimental research , and results of numerical simulation are found to be close to the experimental data 利用ansys有限元程序对翅片管换热器的换热过程进行数值模拟，确定了换热过程中翅片管的温度场和热流量梯度分布状况，对翅片管换热器的多组分流场进行计算，给出了逆流和顺流两种情形下翅片管结构参数对换热效果的影响规律，并利用ansys提供的优化技术编写程序对翅片管进行结构优化设计，为其今后在工业中的设计及使用提供了重要依据。
In this thesis , a closed brayton cycle is proposed , in which the supercritical lng is taken as its cold sink and an industrial waste heat as its heat source . in this thermodynamic system , the heat releasing process in the brayton cycle is a inconstant temperature process and it matches the process of lng boiloff well , therefore , the exergy loss in the heat transfer process is reduced . at the same time , waste - heat can be utilized effectively in the system 一、利用lng冷(火用)与工业余热的闭式brayton循环热力分析本论文讨论了lng在超临界压力下汽化时，选择无相变的brayton循环与之匹配，因为brayton循环的放热过程为变温过程，与lng的汽化过程有可能做到较好的温度匹配，减少换热过程的不可逆损失。
The dissertation combines theoretical analysis and numerical simulation with experience , studied the rib - tube which manufactured by means of cutting - extrusing composite technics . firstly , the development and general situation of numerical heat transfer and fem are summarized , the mathematical and fem models of rib - tube with large aspect ratio are given , and the relative problems are disposed 本文将理论分析、数值计算和实验研究三种方法相结合，以采用切削?挤压复合成形新工艺加工的翅片管为研究对象，对其换热过程进行数值模拟并对其结构进行优化设计。
The paper introduced testing principle of infrared image in course of metallurgy heat engineering testing , based on several applied examples , analyzed application properties and range of infrared image technique and thermal image analysis in heat engineering analysis 内展翅片换热器是针对气(汽) - -液换热过程的各项热阻的特点,在管内轴向胀接波纹形翅片来强化换热的,有效地提高整体换热效率,并且可以承受高压而不发生翅片脱落现象.面对日益紧缺的水资源,它的应用将带来巨大的社会效益和经济效益
