超高静压下传压介质压致升温的规律

通过将温度探头伸入高压腔内在线测定了3种传压介质(癸二酸二辛酯、水、无水乙醇)的温度变化情况,研究它们在不同条件下的压致升温规律.结果表明:在试验条件下,癸二酸二辛酯的压致升温值随压力的增加由0.089℃/MPa降至0.068℃/MPa,且随初始温度的增加而降低;水的压致升温值随压力的增加基本不变,稳定在0.026~0.028℃/MPa之间,且随初始温度的增加而略有增加;无水乙醇的压致升温值受压力影响大于水而小于癸二酸二辛酯,随压力增加由0.082℃/MPa降至0.075℃/MPa,初始温度对其影响大于水,但乙醇压致升温值随着其质量分数的增加而增加.通过聚四氟乙烯套筒和不锈钢套筒模拟不同的热损失条件时,在保压过程中前者对癸二酸二辛酯的保温效果明显高于后者.     

An improved approach for the application of Trombe wall system to building construction with selective thermo-insulation façades

An improved Trombe wall is proposed to adapt to building construction with selective thermo-insulation facades （internal and cavity wall insulation, but not external wall insulation system）. The case study is conducted in Xining, Capital city of Qinghai province in China, where the general building fa- cades are mostly selective thermo-insulation facades to fight against the severe cold. A numerical analysis is undertaken to show the effects on the improvement of the building＇s thermal environment by comparing the improved Trombe wall system with the classical Trombe wall system. The operating efficiency of the improved Trombe wall can be up to 33.85%, an increase of 56%. The results show that the improved Trombe wall works more effectively than the classical Trombe wall system in utilizing solar energy for the sample building.     

废定影液制取超细银粉

阐述了以胶片定影液废液和尿素为原料制备银氨络合物溶胶 ,再采用喷雾热分解法制取超细银粉的新工艺 ,并对其发展前景作了分析     

铝合金触变成形技术及其应用

铝合金触变成形是一种新兴的材料成形工艺,它大大改善压型、压室和冲头的受热条件,延长了使用寿命,制件尺寸精度高,降低制件成本。综述了触变成形技术中的锭坯制备、二次加热、压铸成形和计算机仿真等问题,同时也简述了铝合金触变成形在工业中的应用。     

200MW核供热堆主换热器温度场和流量场计算

主换热器是核供热堆一、二回路之间进行热交换的关键设备。其温度分布和流速分布对主换热器的设计有重要意义。该文采用数值分析的办法进行计算时把主换热器在二维网络中划分成 4个区 ,将整个计算简化成在一定流量场下计算温度场和在一定温度场下计算流量场两部分。计算温度场时要列出热平衡方程组 ,计算流量场时要涉及到压降平衡方程组 ,由于方程组是非线性的 ,采用了 Newton迭代法进行计算。在计算温度场和流量场的同时也得到了传热系数和线性热功率的分布。     

水玻璃砂微波加热过程温度场测试与分析

通过系统测试和分析水玻璃砂在微波加热过程中的温度场,揭示了水玻璃砂微波加热的快速升温及型芯内外同时升温等特性。通过实验和分析,探讨了形成这些特性的原因。提出了微波加热过程中水玻璃砂型芯的升温主要依赖于水玻璃对微波的吸收的观点。     

Fast formation of NaA zeolite membrane in the microwave field

NaA zeolite membrane was successfully synthesized on the porous α-Al₂O₃ support by microwave heating. The synthesis of NaA zeolite membrane in the microwave field only needs 15 min and the synthesis time is 10 times shorter than that by conventional heating. SEM characterization indicates that the zeolite crystals in the NaA zeolite membrane synthesized by microwave heating are uniform in size; the membrane thickness is about 4 μm and is thinner than that of the NaA zeolite membrane synthesized by conventional heating. Gas permeation studies indicate that the permeances of the NaA zeolite membrane synthesized by microwave heating are 3–4 times higher than those of the NaA zeolite membrane synthesized by conventional heating, while their permselectivities are comparable.     

基于金属薄板的电磁加热理论模型的研究

根据良导体中的电磁波基本方程,导出了针对金属薄板涡流的热功率公式,讨论了影响其热功率的因素,对电磁加热的实际应用有一定的意义.     

发汗冷却控制模型边界热流密度的辨识方法

对发汗冷却控制系统的边界热流密度的辨识方法进行了讨论 ;根据实际热层内点温度观测 ,建立了最小二乘指标泛函 ,从理论上证明了最小二乘可辨识性 ;应用最小二乘法及最佳摄动理论 ,给出了基于实际的适时点观测 ,确定了气动加热面边界热流密度的迭代算法。数据试验显示 ,无论是对边界热流的稳衡状态还是热流变化较快 ,此方法都是十分有效的。     

模糊控制在热电厂尖峰加热器温度控制中的应用

针对热电厂供热系统尖峰加热器温度控制的现状。提出了一种智能控制的方法——温度的模糊控制,采用遗传算法寻优隶属函数参数,利用自组织近邻聚类法处理输入输出数据对,结合数据产生模糊规则和语言规则的方法得到模糊规则．仿真结果表明,所设计的模糊控制器控制性能可达到预定的效果。