三角形通道热虹吸泵的性能研究

热虹吸泵的工作特性对小型太阳能无泵LiBr吸收式制冷机的性能有决定性的影响。实践表明,人工增加汽化核心数目,可以有效增加所产生气泡的数量,从而提高热虹吸泵的工作效率、降低系统启动温度。本文提出三角形结构热虹吸泵,并进一步研究运行温度、浸没高度以及绝对压力等因素对溶液提升量及冷剂水产量的影响。该研究有助于小型太阳能无泵LiBr吸收式制冷机的推广应用。     

吸收式冰箱发生器热质分析

讨论了扩散－吸收式冰箱发生器的新结构，以及利用氨水溶液焓－浓度图进行热质分析，以用于优化选择发生器的工作参数。     

对影响扩散--吸收式冰箱COP热力参数的分析

建立了扩散-吸收式冰箱工质的物性模型和热力模型。在模型基础上分析了一些热力参数对COP的影响。本文程序可用于扩散-吸收式冰箱（工质NH3-H2O-He)的热力计算,计算结果对扩散-吸收式冰箱的研究和设计有一定的参考价值。     

扩散——吸收式制冷系统的热力计算

本文对扩散——吸收式制冷系统的工作机理及热力计算进行了探讨。对该系统发生器中热虹吸过程以及吸收器与蒸发器之间的气体循环过程作了热力分析,并提出扩散——吸收式制冷机选定循环参数和热力计算的方法。     

扩散—吸收式冰箱热力循环的模拟与参数分析

本文建立了扩散—吸收式冰箱热力循环及NH_3-H_2O-H_2工质组热力性质的数学模型;并在此基础上模拟了该热力循环。分析了循环的热特性及对其影响较大的参数。模拟程序和结果可用于扩散—吸收式冰箱的研究与设计。     

模糊控制在扩散吸收式冰箱上的应用

探讨模糊控制在扩散吸收式冰箱上的应用。与传统的位式控制相比,模糊控制能够使扩散吸收式冰箱箱内温度更加稳定,效率得到提高。     

《制冷》期刊2006年总目录

2006年第1期(第25卷,总第94期)关于薄膜气调包装数学模型的探讨……………………………………………………………………重庆大学李兴友等(1)燃料电池汽车余热驱动吸附式空调中回质过程对系统性能的影响…………………………………中南大学黄清等(5)空调房间室内热环境的三维数值模拟及实验研究…………………………………………山东建筑工程学院马秀力等(9)论扩散—吸收式冰箱热虹吸泵对制冷系统的影响……………………………广州市联立工业设计有限公司李启奈(15)2004年世界空调器的发展(下)……………………………………………………………     

气泡泵在制冷技术中的应用研究进展

本文回顾了气泡泵研究的相关文献,简要的介绍了气泡泵工作原理,并对应用于扩散-吸收式制冷技术、Einstein循环制冷技术、吸收式制冷技术和太阳能制冷技术的气泡泵研究进展进行总结。提出气泡泵的重要影响参数有结构形式、运行参数和工质三种,并指出气泡泵的基本理论、运行特性和性能提升方法需要更完善和深入的研究。     

小型无泵溴化锂吸收式制冷系统的实验研究

建立了小型太阳能热水型无泵溴化锂吸收式制冷系统，系统主要采用降膜吸收器、降膜蒸发器、弦月型通道热虹吸提升管等新型设计。为了提高制冷系统的整体运行效果，首次设计了一套二次发生装置，使系统能在较低的初始溶液浓度范围（46％～54％）下运行，并保持较高的放气范围和吸收率，有助于提高吸收器性能；并使冷剂水产量较之不使用二次发生器的情况增大1．68倍，明显改善了蒸发效果；对冷凝器与蒸发器间压差的建立也起到一定的作用，改善了制冷系统的整体运行性能，平均制冷系数可达0．725。     

气泡泵在单压吸收制冷系统中的研究进展

本文介绍了气泡泵的工作原理,总结了近年来国内外在单压吸收式制冷系统中气泡泵的研究进展。提出气泡泵的三种重要影响参数分别为结构形式、运行参数和工质,并对扩散-吸收式制冷循环和Einstern制冷循环在理论和实验研究两个方面进行了阐述。同时对影响气泡泵性能的因素以及气泡泵其他方面的研究进行了分类。最后,指出循环中工质的种类以及多管气泡泵中形成提升量的倍增需要更完善和深入的研究。     

吸收式制冷机在节能减排形势下的应用

介绍可应用于工业余热及可再生能源的多种类型的吸收式制冷机的基本原理及主要特点,总结针对不同领域余热利用的吸收式制冷机的合理配置方案。认为该吸收式制冷机可以满足节约能源和保护环境的要求。     

A heating and diffusion barrier based on TaSiNx for miniaturized IC devices

Highly resistive TaSiN_x films investigated as candidates for heating and diffusion-barrier layers for miniaturized IC devices such as a sensor or a phases-change random access memory (PCRAM). The obtained resistivity, between 0.069-1.21 Ω cm, increases with increasing nitrogen content up to 52.83%, and fulfills the requirements as a suitable heating layer. All the as-deposited films were amorphous, and the films with substantial nitrogen content showed excellent thermal stability The amorphous structure had a very smooth surface which was stable at temperatures up to 800 °C. In addition to its heating capability, the amorphous structure with no grain boundaries was found to also act as a good diffusion barrier effect in contact with a tungsten electrode as determined by AES an TEM analysis. The barrier effect was evaluated by an annealing at 500 and 600 °C in Ar atmosphere for 30 min, respectively. The highly resistive TaSiN_x heating layer successfully obstructed the diffusion of tungsten atoms from the W electrodes even when the layer was only 10 nm thick. With increasing N content, the heating and diffusion-barrier layer for PCRAM was proposed as a typical example of many potential applications.     

Integration of superconducting magnets with cryogen-free dilution refrigerator systems

There has been much recent research interest into “cryogen-free” dilution refrigerators. Cryogen-free systems have some advantages from a safety and convenience point of view as liquid cryogens are unnecessary. However, this also makes integrating the low-temperature system with a high magnetic field environment much more challenging. Here we shall describe recent successes of integrating superconducting magnets and dilution refrigerators into one system requiring a single pulse tube cooler. The resulting environment provides experimental temperatures between 7 mK and 30 K and magnetic fields up to 12 T. We shall describe the effects of AC loss heating in such systems on the pulse tube refrigerator when the field is ramped and also the effects of eddy current heating on the mixing chamber in sweeping fields.     

关于嘉定区某医院中央空调机组方案论证

本文对某项目空调机组采暖设备方案论证,从初投资,年经营费,能耗和环境等方面进行了经济技术比较,推荐使用溴化锂机组和螺杆式冷水机组联合运行方案的最优方案。     

Forced convection of low temperature nitrogen gas in rectangular channels with small aspect ratio

Forced convection of low temperature (80-150 K) nitrogen gas flowing through rectangular channels with hydraulic diameters of 0.513-1.814 mm and aspect ratios of 0.013-0.048 has been investigated experimentally. Close attention was focused on the effects of channel depth and heat addition on the heat transfer and flow characteristics, the transition from laminar to turbulent flow and the existence of an optimum channel depth. A dimensionless heating number was adopted to characterize the heating effect. The experimental correlation developed for the Nusselt number shows that the heat addition is the most important effect, followed by the channel aspect ratio, Reynolds number and Prandtl number.     

Microwave–material interaction phenomena: Heating mechanisms,challenges and opportunities in material processing

Efforts to use microwaves in material processing are gradually increasing. However, the phenomena associated with the processing are less understood; popular mechanisms such as dipolar heating and conduction heating have been mostly explored. The current paper reviews most of the significant phenomena that cause heating during microwave–material interaction and heat transfer during microwave energy absorption in materials. Mechanisms involved during interaction of microwave with characteristically different materials – metals, non-metals and composites (metal matrix composites, ceramic matrix composites and polymer matrix composites) have been discussed using suitable illustrations. It was observed that while microwave heating of metal based materials is due to the magnetic field based loss effects, dipolar loss and conduction loss are the phenomena associated with the electric field effects in microwave heating of non-metals. Challenges in processing of advanced materials, particularly composites have been identified from the available literature; further research directions with possible benefits have been highlighted.     

Effect of heating rate on the hysteresis in the phase transition in silver telluride thin films

The electrical resistance of vacuum deposited silver telluride thin films was measured in the temperature range from 300 to 430 K at different heating rates. It is found that silver telluride films undergo a structural phase transition, with a hysteresis. The phase transition occurs over a wide temperature range of about 30 K and the transition temperature as well as the hysteresis width are found to be influenced by the heating rate. The effect of heating rate on the phase transition temperature and the hysteresis are discussed.     

一种新型的制冷、制热、制热水联合机组的研发及其经济分析

本文分析了现有空调冷凝热回收热水供应技术存在的缺点，提出了一种新型的制冷、制热、制热水联合机组的工作原理、特点、应用及经济分析。     

主动式太阳能供暖系统的研究现状综述

从主动式太阳能供暖系统的组成出发,即集热器、储热蓄热部分、辅助热源、供暖末端等,分析了各个组成部分的研究现状和未来发展趋势。对蓄热部分分析了在主动式太阳能供暖中短期蓄热和季节蓄热的研究现状。对供暖末端分析了低温散热器、相变储能地板、相变墙体等在主动式太阳能供暖中的应用。