第三代核电机组常规岛主汽管材配置及壁厚计算设计探讨

相比国内已运行的核电机组,第三代(AP1000)核电机组存在主蒸汽流量大、设计使用寿命长等特点,需要重新研究其主汽管道设计中的管材配置与管道规格计算方法。目前在建的核电机组常规岛主汽管道设计所选取的管材配置各不相同,进而影响了保证汽水管道安全性和经济性的极为重要的参数—管道壁厚的计算。本文通过调研、计算理论研究和典型计算分析等手段分析了AP1000核电机组主蒸汽管道选材和计算壁厚之间的相互关系,并初步提出AP1000核电机组主蒸汽管材配置和壁厚计算推荐方案。

Transient Thermal Management Comparison of a Microprocessor Using PCMs in Various Configurations

There has been a strong interest in the use of Phase Change Materials (PCMs) for the transient thermal abatement of high powered microprocessor.This paper presents a set of transient computational analysis for selected IC packages with the purpose of calibrating the merits of PCM in different configurations.The transient analysis of high powered microprocessors with heat sinks was performed as a benchmark for comparison with the same microprocessors fitted with PCM in the following configurations:a) PCM imbedded into the finned region of the heat sink,b) PCM mounted between the microprocessor and heat sink,c) sealed PCM underfill to the microprocessor and d) PCM fitted to the underside of the printed circuit board directly beneath the microprocessor.The analysis was performed using a commercial CFD tool together with an approximation to the phase change mechanism using the slope method.Results indicate the merit of each configuration.