DX-400水冷发射机冷却系统状态检测装置及故障保护

DX-400水冷发射机冷却系统正常运行是发射机稳定播出的重要保障。DX-400冷却系统状态检测及故障保护装置不仅直观的显示出冷却系统是否在正常运行的状态下,而且当冷却系统出现故障时,能第一时间的作出保护动作。文章主要介绍DX-400冷却系统状态检测及故障保护的各个装置的方位、工作原理、维护要点。     

DF100A型短波发射机冷却系统稳定性分析

冷却系统是广播发射机的重要组成部分,冷却系统工作的稳定性与发射机播出的稳定性息息相关。本文对DF100A型短波发射机冷却系统的常见故障进行了分析,并提出了相关的改进措施。     

混凝土搅拌运输车的液压传动系统探究

随着我国经济的飞速发展,土建行业的发展速度也逐步加快。混泥土作为二十一世纪的重要建筑材料,在土建行业施工中有着举足轻重的地位。混凝土不仅是建筑材料,还是目前主要的建筑粘合剂,是城镇化过程中不可或缺的材料,但由于其性质特殊,在运输过程中如有不良情况出现,将导致整个工程的质量下降。本文针对于混凝土搅拌运输车的液压传动系统进行探究,为解决混凝土在运输过程中存在的缺陷提出改进建议。     

冷却系统对电视发射机的影响

1引言电视发射机（包括电子管发射机和全固态发射机）大致包括电源系统、激励器系统、功率放大系统、主控系统、电控系统及冷却系统等几部分,其中,冷却系统是一个重要的组成部分,良好的冷却系统是发射机正常工作的首要条件。     

矿用车发动机冷却系统的优化设计

文章以某型号矿用车发动机冷却系统为研究对象,针对矿用车辆在矿区恶劣环境下工作时,现行的发动机冷却系统无法保证发动机在最佳工况条件下运行的问题。通过设计电动水泵实时控制系统对该冷却系统进行优化设计,经过测试,能够解决矿用车发动机冷却系统存在的问题,为矿用车辆发动机冷却系统的优化设计提供一种有效合理的途径。     

一种主振放大链式发射机冷却系统的热力学研究

以某雷达主振放大链式发射机液体冷却系统为基础,建立了液冷系统的热力学模型,并重点对该模型进行热交换器的热力学分析,推导出理论上所需冷却系统的散热功率。对该雷达冷却系统的测试表明,被冷却器件实际的发热功率低于理论推导功率,即该冷却系统能满足电子器件冷却的要求。     

屋顶绿化的研究现状及发展趋势

介绍了屋顶绿化的意义,在综合大量屋顶绿化文献和已有研究成果基础上,分析了屋顶绿化研究现状,并根据屋顶绿化的相关政策法规,提出了屋顶绿化的发展趋势。     

PSM广播发射机电子管蒸发冷却的研究

PSM广播发射机电子管降温主要是通过PSM广播发射机蒸发冷却系统实现的。PSM广播发射机蒸发冷却系统主要的工作原理为：把作为主要热量来源的电子管安装在蒸发锅内,然后通过蒸馏水将热量传导出去的主要热量来源本文介绍了PSM广播发射机蒸发冷却系统的工作原理、优点以及使用过程中应该注意的问题。     

数据中心冷却系统设备能效影响因素分析

数据中心各冷却设备的高效运行对冷却系统整体降耗影响较大。本文分析了数据中心空调负荷以及数据中心主要冷却设备的能效影响因素,并总结得到提高冷却系统设备整体能效的途径,以指导数据中心冷却系统的节能设计和运维。     

大功率广播发射机房冷却系统精准制冷的设计与实施

本文对大功率广播发射台机房冷却系统存在的问题进行了分析,提出了冷却系统的改造新方案,介绍了方案的实施情况,并通过冷却系统改造前后的对比,总结出了其所具有的优越性.     

Experimental investigation of a Peltier cells cooling system for a Switch-Mode Power Supply

The results are presented of an experimental investigation in a liquid cooled Switch-Mode Power Supply (SMPS). The target is a quantitative analysis of the performance of a cooling system designed to dissipate the heat generated by the active and passive electronic components of this SMPS, in order to limit its maximum operational temperature. The active components are cooled with a liquid cold plate. The passive components are cooled with an air flow. The temperature of this airflow is controlled with Peltier cells exchanging heat with the cold plate. Measurements are made of temperature and of electric efficiency of the SMPS. The cooling system is placed in an experimental tool where it is possible to measure and control the cooling liquid flow. A detailed analysis of the thermal behaviour of this cooling system is given. Finally, the practical significance of the problem is discussed.     

Limits of Heat Removal in Microelectronic Systems

Thermal management issues play an increasingly prominent role in microelectronic system design. The constraints on heat removal are a major factor limiting the performance of a microelectronic system. This work presents the thermodynamic limit of performance for a thermal solution utilizing air cooling to reject thermal energy as the inverse of its mass flow-heat capacity product. The minimum resistance to heat flow offered by a thermal solution is further refined by including the effects of thermal interface materials, substrate materials, and the impact of nonuniform device layer heating. Active cooling solutions may offer additional needed cooling for microelectronics systems, but the system thermal resistances limit its applicability. This work describes the minimum efficiency that an active cooling solution must provide to offer a thermal advantage over passive cooling. This minimum efficiency is dictated by the thermal resistances involved in drawing heat into the active cooler and expelling heat to the ambient environment. Knowledge of the fundamental limitations of thermal solutions gives system designers realistic expectations to set roadmaps, define architecture specifications, and evaluate the validity of thermal system performance claims     

无源定位目标跟踪雷达系统数据融合方法研究

无源定位目标跟踪雷达系统数据融合方法是信号处理的研究热点,为了探寻无源定位中数据融合的有利方法,系统分析了无源数据关联中系统数据融合的方法,给出了灰关联方法等的具体处理步骤,并通过仿真给出了处理结果。由利用灰关联对ESM的时间-方位曲线进行融合,和情报库对比,关联成功率为100%,平台身份识别率为100%。     

防凝水控制策略在混凝土楼板辐射空调系统中的运用

提出了控制凝水策略，可以大大简化由“防结露”引发的十分复杂的空调冷冻水路及其控制。针对混凝土楼板辐射空调系统的特点，依据实例的实测与分析，证实了该策略应用于混凝土楼板辐射供冷房间是可行的。研究了现有几种复合型吸湿涂料的等温吸湿特性应用于混凝土楼板辐射空调系统，分析带来的额外一次和二次费用收益。     

办公建筑围护结构节能改造及模拟分析

以湖南地区某办公建筑为研究对象,对围护结构分别进行外墙节能改造、外窗节能改造、屋面节能改造及增设内外遮阳系统等方案进行模拟分析。分析结果表明,对冬季热负荷影响最大是外墙外保温的泡沫玻璃保温体系,对夏季冷负荷影响最大是外遮阳。     

北京某工程水蓄能设计及技术经济分析

在北京某开发区多层厂房工程空调系统设计中,采用了水蓄能的冷热源系统型式,针对该工程的具体情况对水蓄能系统与常规空调系统作了技术经济分析,对水蓄能在实际工程中应用方面进行了探讨。     

Radiative cooling under the conditions of magnetoconcentration

The results of theoretical and experimental studies of the time dependences of radiative cooling produced by a pulsed semiconductor source of negative interband luminescence are presented. The kinetics of cooling and subsequent temperature relaxation of the passive element, which depend on the power and duration of the luminescence pulse, are studied. It is shown that the luminescence excitation method employed (the magnetoconcentration effect) makes possible both radiative cooling and heating of the passive element; this is promising for practical applications. The results of a theoretical study are in qualitative agreement with the experimental data. The maximum cooling achieved in the experiment at room temperature is 0.62 K. Fiz. Tekh. Poluprovodn. 31, 498–502 (April 1997)     

Reliability enhancement by integrated liquid cooling in power IGBT modules for hybrid and electric vehicles

Insulated Gate Bipolar Transistor (IGBT) modules in power train system of Hybrid and Electric Vehicles (HEV/EV) are working in harsh environment and high reliability and long lifetime are required. In this work, reliability enhancement by integrated liquid cooling structure in HEV/EV IGBT module is investigated. The thermal resistance of junction to heat sink can be reduced more than 50% by direct liquid cooling as eliminating thermal grease layer, so both active and passive temperature swings decrease significantly which will enhance module reliability and lifetime. The lifetime of modules with conventional and integrated liquid cooling structures are estimated under mission of standard driving cycles. We found that lifetime is prolonged obviously by direct cooling pin–fin base plate, and the compact module also makes the application power system simple and reliable.     

Evaporation-condensation cooling systems for electronic equipment

The paper shows that heat pipes with metal-fibrous capillary structures and evaporation-condensation cooling system based on heat pipes are highly efficient means of providing optimal thermal conditions for different electronic instruments and devices. Such cooling system combining the functions of effective heating conduit (equivalent heat conductivity is much higher than the heat conductivity of the best heat-conducting materials) and effective radiator with the possibility of passive heat dissipation is characterized by a high heat transport ability, low thermal resistance, relatively small size and weight, reliable performance at different orientation in space under exposure to mass forces action. The paper presents examples of developed designs and investigations of heat pipes and evaporation-condensation systems with metal-fibrous capillary structures aimed at cooling the different heat generating items of electronic equipment. In this case, special types and designs of systems are discussed. These systems operate under different conditions of heat removal to absorbing medium and feature both a high heat transport ability and specific dielectric properties. In addition, the thermotechnical characteristics of proposed cooling systems are also presented.     

辐射冷却材料的研究进展及应用

辐射冷却是近来日益得到关注的被动冷却形式,它以外太空为冷源,无需额外消耗能量,在建筑冷却、太阳能电池降温、舒适衣物与可穿戴设备等诸多方面都有着良好的应用前景.本文对辐射冷却的发展历史与冷却原理做了简单回顾,对辐射冷却材料的种类和优缺点进行了系统介绍,并对辐射冷却材料的设计、制备、表征方法进行归纳总结,最后对相关应用领域...