Uneven gridding of thermal nodal networks in floor heating simulations

In this paper, the use of an uneven nodal network in floor heating simulation with finite difference heat balance method is examined. Two floor heating test cases, homogenous and multilayer floor, are presented. Temperature distributions on the floor surface and heat flows through the floor surface are simulated with even and uneven gridding approaches. It is shown that the total number of nodes can be reduced by placing the densest gridding in sections where the curvature of the temperature gradient is steepest.     

利用热管纺丝技术一步法生产FCY

利用平板型热管纺丝装置对普通高速纺丝机进行技术改造，并一步法生产出充分结晶的ＰＥＴ纤维（ＦＣＹ）。该纤维可直接用于织造，调节热管温度、热管安装位置可获得满足后道工序不同需要的ＦＣＹ。     

耐高温辐射涂料在加热炉上的应用

分析了耐高温辐射涂料(HT—1)在加热炉应用的节能机理,工业实验取得良好效果。     

中国先进研究堆冷中子源核发热和冷中子增益研究

为准确计算和研究中国先进研究堆（CARR）冷中子源装置氢系统的核发热和冷中子增益，建立了一整套计算方法。对参考堆的验证计算证明了该方法的正确性和有效性。对影响CARR冷中子源核发热和冷中子增益的各种因素（如慢化剂、冷包材料、冷包形状等）进行了计算和优化选择。结果表明：在核发热量较小的条件下获得了较好的冷中子增益。     

宣钢棒材加热炉悬臂辊道的改进

对宣钢棒材加热炉出入炉悬臂辊道漏水、烧损等现象进行了分析，提出了改进措施。     

分布式集中供热微机控制系统

由供热站控制装置、温度巡测仪和ＰＣ－３８６微机构成对供热站及热用户的多种现场参数进行采集与控制。文中提出了一种根据补水进行前馈控制的方法。并给出了远距离测温探头的实际应用线路。     

燃油加热炉改烧奥里油的尝试

奥里油是一种含乳化液较多的新油种，作者配合某厂机动处,对该油种进行了理论分析,并在连续加热炉上替代重油燃烧进行了有益的尝试。     

自动化控制系统在城市集中供热领域的应用

介绍自动控制系统在城市供热领域的应用,达到热网热平衡、节能环保及节省投资等目的。     

连续推钢式加热炉汽包假水位事故分析

分析棒线材厂加热炉汽包出现假水位造成的事故原因,并提出整改措施。     

Influence of base resistance on extracting thermal resistance for SiGe HBTs

In this article, the influence of base resistance on extracting thermal resistance for SiGe heterojunction bipolar transistors is studied and an improved approach for determining the junction temperature and thermal resistance is presented. The proposed method for extracting thermal resistance is based on the temperature sensitivity of the base–emitter (B–E) voltage when the device is biased with a fixed emitter current density. This approach not only takes into account the self‐heating during the different ambient temperature measurement but also revises the empirical equation of B–E voltage due to the influence of base resistance during the power dissipation increment measurement. Results are obtained for devices with different emitter lengths and fingers. Compared with the conventional method, the thermal resistance is about up to 15% improvement for the device with 0.3 × 1.9 μm² emitter area and 13.8% for the device with 0.3 × 13.9 μm² emitter area. The accurate thermal resistance implemented in HICUM model has resulted in better fit for transistor output characteristics. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012.