热管式定风量换气节能装置的设计及性能分析

主要研究了兼顾火电机组经济性与环保性的负荷优化分配算法,建立了考虑阀点效应的多目标负荷分配模型。应用自主编写的算法,获得了待决策的非支配解集合(Pareto front,PF),其中算法的核心操作是多目标融合、剔除同一层相近个体、保留不同层差异个体。给出了6台机组的负荷优化分配算例,仿真结果验证了模型的合理性,并表明方法可以进一步减少火电机组煤耗成本和污染物排放量。结合逼近理想解排序法(technique for order preference by similarity to an ideel solution,TOPSIS),讨论了不同目标权重下负荷分配方案的区别,证明了基于TOPSIS的多目标负荷分配方案的确定依赖于各自目标在决策中所占的重要程度。     

热管式定风量换气节能装置的设计与应用

针对严寒地区冬季室内空气质量差和能耗居高不下双重问题,利用热管的高导热性设计出热管式定风量换气节能装置,并由FLUENT软件按照实际工程参数对室内气流组织进行模拟,再将其结果与风机盘管加新风系统进行对比。结果表明,两种情况下的房间速度分布基本相同,但温度分布有差异。综合室内温度分布、气流分布、节约能耗角度考虑,提出的新型装置具有较大的研究和推广价值。     

热管式空调换气换热器的设计与研究

本文提出了一种以热管为传热元件的全气候使用的空调换气换热器，就其设计特点、结构型式及性能评价和效益分析作了叙述。换热器中的热管采用氨－铝热管，分重力式热管和吸液芯式换管两种。重力式热管空调换气换热器采用了随电机正反转改变进排气方向的轴流式风机；吸液芯式换热器采用了特殊结构设计，解决了吸液芯热管受安装误差带来的热管半失效问题。     

热管式低压省煤器的特点与节能效果

概要介绍了热管式低压省煤器的原理，特点以及在实际应用中的节能效果。     

利用热管技术节能与控制环境污染

当代世界的能源主要来自石油、煤炭、天然气等大量化石矿物燃料。这些化石燃料燃烧时的产物严重地污染着人类生存的环境。我国的各种燃烧设备的燃烧效率和热能利用率大部分较低 ,燃料消耗量较大、燃烧过程产生的污染物较多 ,严重污染环境 ,特别是城市。因此 ,迫切需要利用先进     

新型节能传热元件-热管

本文主要介绍了热管的工作原理及其在工业锅炉节能中的应用,以及热管省煤器、热管预热器在锅炉行业中与传统结构相比较所表现出的卓越性能及优点,并对其未来的发展提出展望。     

脉动热管用于空调排风余冷回收的试验研究

设计加工1台脉动热管式换热器,用于夏季工况空调排风的余冷回收。通过实验,分析了风速、新排风温差等因素对余冷回收效率的影响,以及两侧压力损失随风速的变化情况。结果表明,余冷回收效率随新风、排风温差增大而升高,随风速的增大而降低。该换热器具有一定的优势,但还需进一步改进结构,以提高其效率。     

Investigation into the performance of a micro gravitational heat pipe and a micro gravitational heat pipe with artery

The performance of a normal micro gravitational heat pipe was investigated using the analytical and numerical models previously developed. An innovative structure of the heat pipe, i.e. the micro gravitational heat pipe with artery, was then proposed in an attempt to overcome some of the drawbacks of the normal pipe. The thermal behaviour of the new type of heat pipe was simulated, and this was compared with that of a normal micro heat pipe. A performance estimation of both pipes was carried out based on the simulation results. Copyright © 2002 John Wiley & Sons, Ltd.     

冷凝锅炉尾部翅片管束换热器的复合放热特性及节能效果

介绍了一台燃气锅炉在尾部加装翅片管束冷凝换热装置后的实炉运行情况及节能效果。运行结果表明：加装分离式冷凝换热器回收燃气锅炉尾气中的显热与潜热，技术措施可行，节能效果明显，热效率提高6％以上，经济效益可观。通过实炉实验研究还获得了低烟速下含有水蒸气冷凝换热的翅片管束复合放热特性实验关联式，可供设计及运行单位参考。     

热管PCM热控装置设计及性能研究

针对某弹载相控阵天线的热设计难题,提出一种全新的由热管与相变材料联合进行热管理的方案,并设计了热管PCM热控装置。建立了采用该型热控装置的相控阵天线数学模型,对其热控过程进行了数值模拟,随后对热控装置的性能进行了试验测试,测得热源安装面最高温度为124.5℃。将测试结果与模拟结果进行对比,结果相吻合,两者最大偏差不超过15%,热管PCM热控装置可以解决天线的热设计难题。最后对该热控装置进行了改进,改进后储热器内PCM温度梯度有效降低,热源安装面最高温度降低了6.7℃。研究表明,作为弹载热控领域的新方向,热管PCM联合热控的方案合理可行,可应用于实际工程问题。     

The effect of condenser heat transfer on the energy performance of a plate heat pipe solar collector

For a novel prototype solar collector, using a plate heat pipe, condenser heat transfer was analysed in detail. The condenser has the shape of a rectangular channel. Flow and heat transfer of water in the rectangular channel was modelled and the heat transfer coefficient assessed, using the Fluent code. Under typical operating conditions a mixed convection situation occurs. The channel is inclined and heating is through one wall only (upper channel surface). The range of temperature differences considered was similar to the one verified under real operating conditions, covering a wide range of Grashof numbers. Results showed that the Nusselt number is significantly higher than the one for forced convection in a rectangular channel with fully developed boundary layers. In order to enhance heat transfer, a modification to the rectangular channel was analysed, using baffles to improve flow distribution and increase velocity. The effect of this modification on collector energy performance (efficiency) was assessed. Copyright © 2005 John Wiley & Sons, Ltd.     

热管式聚光光伏冷却集热装置的应用研究

文章设计了一种热管式聚光光伏冷却集热装置,利用热管原理来改变翅片式风冷光伏散热器、管路式水冷光伏散热器的设计思路,通过将热管端蒸发段的介质输送到冷凝端进行换热的相变过程,使得光伏基板的热量迅速传递到冷凝端水箱中,达到降温和集热的双重效果。热管式聚光光伏冷却集热装置不仅能够对光伏组件进行快速冷却,使整个光伏组件换热面温度分布均匀,提高光伏系统的发电效率,还可将多余热量进行收集利用,提高发电收益,在聚光光伏发电领域中具有广阔的市场前景。     

Solar energy storage via a closed-loop chemical heat pipe

The performance of a solar chemical heat pipe was studied using CO₂ reforming of methane as the vehicle for storage and transport of solar energy. The endothermic reforming reaction was carried out with a reactor packed with a supported rhodium catalyst and heated by the concentrated solar flux from the Schaeffer solar furnace at the Weizmann Institute (Rehovot, Israel). The maximum absorbed power was 8.5 kW. The reforming was run under variable insolation conditions, including partly cloudy days. The flux input was regulated by opening the doors of the concentrator building. The product gas temperature followed a predetermined set point that automatically controlled the flow of reactants to ensure constant composition of the reformer products. The exothermic methanation reaction was run in a multistage methanator filled with the same Rh catalyst and fed with the products from the reformer. High conversions were achieved for both reactions. In the closed-loop mode, the products from thereformer and from the methanator were compressed into separate storage tanks. The two reactions were run consecutively, and the whole process was repeated for over 60 cycles. The overall performance of the closed loop was satisfactory; scale-up work is in progress.     

The energy saving obtainable with solar heating and heat pumps in a northern climate

The energy saving obtainable with active solar heating and heat pumps has been studied for several years in the Northern climate of Finland. The studies deal mainly with small houses. A computer program is developed which calculates hour by hour the annual energy balance of different heating systems. The performance, of the heating systems are also measured in inhabited houses. The calculations show that the useful solar energy obtainable from the collector is 50–400 kWh/m² annually depending on the system and the collector size. A heat pump in the system is very advantageous, because it keeps the heat losses low and the collector efficiency high. It approximately doubles the energy obtainable. The measurement results have not been as good as expected. The solar energy obtained from the collector has been 120–160 kWh/m² annually. The main reasons for the low solar energy are design and equipment faults and the shading effects. The best energy saving device is the earth heat pump. It is also therefore very advantageous that the peak power demand decreases markedly. When the area of the earth pipes is large enough, energy may be extracted from earth through the whole year. The annual coefficient of performance is 2–3. Also a heat pump which extracts heat from exhaust air in dwelling houses has been very promising.