电伴热系统的应用与管道温度偏差的控制研究

郑西客运专线西安北站房工程的大部分管道处于室外或半室外空间,在冬季会有冻裂的危险。而电伴热方法可补充管道的热量损失,维持管道的温度,使得管道的温度偏差不会超过规定值,从而避免了管道的冻裂。阐述了电伴热系统的工作原理与特点,介绍了伴热电缆的施工技术。     

3种工况下多功能太阳能热泵的热泵制热水性能

简要介绍一种多功能太阳能热泵(MSAHP)系统的基本原理及其可实现的功能模式.对MSAHP样机在3种不同工况下热泵制热水性能进行了实验研究和对比分析,系统最高性能系数为6.1,在低温环境下性能系数范围也能达到1.8～5.9,表明MSAHP在热泵制热水模式下具有明显的节能效果.     

浅谈锅炉相变改造和分区供热经验

本文论述了在锅炉技术改造中采用相变技术,将强制循环旗帜管锅炉改造成蒸汽换热式热水锅炉的经验、供热运行管理上采用的分区分时供热方法、以及分区分时的几种运行方式对锅炉运行产生的节能效果。     

集中供热水力失调的解决方法

介绍了供热系统水力失调的概念．通过对集中供热系统水力失调原因的分析，提出了解决水力失调的方法。     

燃气-太阳能空调系统采暖季的运行模拟及分析

提出太阳能集热器阵与直燃型吸收式冷温水机联合采暖系统,并建立系统逐时运行的数学模型.然后以东华大学3,4号学院楼空调系统的节能改造方案为应用实例,编写计算机程序进行数值模拟.模拟结果揭示了该改造系统的运行情况、影响系统运行的因素.该结果对学院楼现有空调系统的改造工作具有指导意义,对类似工程也具有参考价值.     

Chinese kangs and building energy consumption

Chinese kangs are an integrated system for cooking, sleeping and heating in rural Northern China with more than 2000 years history. In 2004 there were 67 million Chinese kangs used by 44 million rural families or 174 million people. Chinese kangs store surplus heat from stove during cooking and releases it later for both home heating and localized bed heating. Such a widely used heating system has been rarely studied. Understanding kangs is important for developing new effective home heating systems for better energy efficiency and improving indoor air quality in Northern China. In this paper, we review and present some preliminary results from our field measurement and mathematical modeling, and discuss the development of Chinese kangs as related to future energy consumption in rural homes, and building energy consumption in China in general. We suggest that transition and new technologies for rural home heating in Northern China, i.e. the future of Chinese kangs, should be considered as the top priority in managing future building energy consumption in China. Supported by the grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Grant No. HKU 7154/05E) and National Natural Science Foundation of China 2007 Young Researcher Award (Grant No. 50729803) The work is also a part of the International Energy Agency Annex 44 project on Integrating Environmentally Responsive Elements in Buildings.     

Ultra fast microwave-assisted leaching for the recovery of copper and tellurium from copper anode slime

The decomposition of copper anode slime heated by microwave energy in a sulfuric acid medium was investigated. Leaching experiments were carried out in a multi-mode cavity with microwave assistance. The leaching process parameters were optimized using response surface methodology (RSM). Under the optimized conditions, the leaching efficiencies of copper and tellurium were 99.56% ±0.16% and 98.68% ±0.12%, respectively. Meanwhile, a conventional leaching experiment was performed in order to evaluate the influence of microwave radiation. The mechanism of microwave-assisted leaching of copper anode slime was also investigated. In the results, the microwave technology is demonstrated to have a great potential to improve the leaching efficiency and reduce the leaching time. The enhanced recoveries of copper and tellurium are believed to result from the presence of a temperature gradient due to the shallow microwave penetration depth and the superheating at the solid-liquid interface.     

变室温供暖房间动态特性模拟

建立了某房间围护结构、散热器、温控阀的数学模型,基于房间热平衡理论联立各模型求解,得出设定条件下室内温度、散热器流量、散热量及外墙各层温度的动态变化规律．研究结果表明：室外温受在10℃温差范围内波动时,外保温外墙的保温层内侧温度受室外温度影响很小,散热器温控阀调节流量对室内温度影响不大,室内温度还受墙体蓄热和放热的影响．     

微波照射花岗岩型铀矿石试样力学特性试验研究

为了探究花岗岩型铀矿石在微波照射下的裂隙演化和强度变化规律及破碎特征.利用JYC-3型微波高温焙烧炉,微波功率为1 kW、2 kW和3 kW分别对干燥试样和水饱和试样照射30 min和45 min,再进行自然冷却和水淬冷却;采用RMT-150 B岩石力学试验机对冷却后的试样进行单轴压缩试验,分析其裂隙演化和强度变化规律...     

激光处理不镀铬枪炮管提高抗烧蚀寿命的研究

用连续ＣＯ２激光束处理了１２．７ｍｍ烧蚀试验枪衬管，经实弹射击考核其抗烧蚀寿命比未经处理的枪管提高４０％以上。借助扫描电镜（ＳＥＭ）对射击后的枪管进行了解剖对比分析；结果表明：激光相变硬化层显著提高了膛面抗热－机械疲劳裂纹的扩展能力，其原因是裂纹前端形成了超载塑性区阻滞了裂纹的扩展。