共查询到20条相似文献,搜索用时 109 毫秒
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《制冷与空调(四川)》2019,(6)
针对组合式箱空气加热器或者表面冷却器安装使用的自动调节阀流量系数选型过小,导致在极端天气下,空调空气换热器供热或供冷不足,影响温湿度的调控,建立了热力学计算模型,通过理论设计可使管道管径和阀门流量系数选型科学合理,满足异常气候变化的冗余设计要求。 相似文献
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综合分析了空气冷却器(换热器)在航空发动机上的应用方向,明确指出紧凑高效是航空发动机用空气冷却器的主要技术特点。为实现紧凑高效的设计需求,必须应用有效地流动传热试验方法及分析技术。温度变化和压力损失是衡量空气冷却器的直接技术指标,应用常规测量技术可以获得,同时也需要借助PIV和MRI等先进测试手段开展流动和传热优化设计。在分析技术的研究中发现:热动力曲线和传热有效度分析方法可以更直观地表征空气冷却器的换热性能,有利于工程应用。 相似文献
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一、两个蒸发温度合用一个中间冷却器及其优点采用氨双级压缩制冷的冷藏库,对中间冷却器的布置有下列三种做法: 1.每台(组合式双级压缩机为每套)氨双级压缩机布置一个中间冷却器。这种做法的优点是:只要在压缩机低压缸吸入和中间冷却器蛇形管出液管上装设旁通阀,就能打二个蒸发温度中任意一个蒸发温度,因此操作比较方便,见图1。这种做法的缺点是:由于中 相似文献
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文章介绍了蒸发冷却器的原理,并以某电厂2×350MW间接空冷机组设计为例,对蒸发冷却器和机械通风湿冷塔进行了技术经济比较。结果表明,蒸发式冷却器与机械通风湿冷塔相比,具有节水、运行费用低等诸多有点,特别适合于间接空冷机组。 相似文献
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《中国新技术新产品》2015,(13)
根据哈尔滨电机厂600MW发电机氢气冷却器整体构造特点,结合发电机产品使用说明书关于600MW机组发电机退出一组氢气冷却器时可以带80%负荷的安全运行要求,制作发电机氢气冷却器在线清洗专用工具,除去氢气冷却器管道内壁附着物,提高氢气冷却器热交换效率,保证发电机运行中冷氢温度在合格范围,实现发电机按设计值出力安全、稳定运行。 相似文献
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变压吸附—低温精馏组合式制氧机 总被引:2,自引:1,他引:1
介绍了美国UEI公司的变压吸附—低温精馏的组合式制氧机的基本原理和工艺流程,组合式制氧机的特点、能耗和投资分析.列出了UEI为转炉炼钢设计的20000m~3/h组合式机组生产氧、氮、氩的主要指标.组合式制氧机发挥了两种制氧方法的各自优势,有广阔的发展前景.图3表2参2. 相似文献
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The thermal connection between a cryocooler cold tip and any object to be cooled (the thermal load) is very often a technical challenge. The allowed mechanical load on the cooler cold finger is generally strongly restricted. It is therefore difficult to design a mechanically anchored thermal link with low induced mechanical load and high thermal conductance. The proposed heat link concept is based on an evaporation/condensation process between the cooler cold tip and the thermal load. 相似文献
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以原有成型机组的研究成果为基础,结合多领域的市场需求,在机组结构上采用新技术及新工艺,对一种新型、多功能小截面金属成型机组的基本组成、工作原理和主要技术参数等进行设计、优化和创新,使其体现出6大创新点,综合性能得以充分发挥,通过解决相关技术问题,该多功能小截面金属成型机组实现了多领域广泛应用. 相似文献
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Alexander Dvornitsyn Vjacheslav Naer Andrey Rozhentsev 《International Journal of Refrigeration》2006,29(1):101-109
A bottle-sublimation cooler is an open-cycle cooler of novel design combining the advantages of Joule–Thomson and sublimation coolers. The store of a refrigerant is bottled without heat leakages at ambient temperature. Sublimation of the refrigerant solid phase is the cold-generating process in the cooler. The cooler design and a discovered effect of the solid phase spontaneous capillary-porous structuring provide autoadjustability of the system operational characteristics. The results of experimental investigations of the stored-carbon dioxide bottle-sublimation cooler are reported in this paper. The experimental set-up and procedure of the system principal parameters measurement are covered. Temperature, thermal and overall size-mass parameters of the cooler are measured and reported. Performance specification of the cooler, which had been used for refrigerating of the IR module of a star spectrophotometer during astronomical observations, is presented. 相似文献
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A system design method of thermoelectric cooler is developed in the present study. The design calculation utilizes the performance curve of the thermoelectric module that is determined experimentally. An automatic test apparatus was designed and built to illustrate the testing. The performance test results of the module are used to determine the physical properties and derive an empirical relation for the performance of thermoelectric module. These results are then used in the system analysis of a thermoelectric cooler using a thermal network model. The thermal resistance of heat sink is chosen as one of the key parameters in the design of a thermoelectric cooler. The system simulation shows that there exists a cheapest heat sink for the design of a thermoelectric cooler. It is also shown that the system simulation coincides with experimental data of a thermoelectric cooler using an air-cooled heat sink with thermal resistance 0.2515°C/W. An optimal design of thermoelectric cooler at the conditions of optimal COP is also studied. The optimal design can be made either on the basis of the maximum value of the optimal cooling capacity, or on the basis of the best heat sink technology available. 相似文献
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建立了跨临界二氧化碳热泵热水系统中的气体冷却器模型,对管内二氧化碳和水侧的流动和传热进行了数值仿真;并运用该模型分析了系统运行时各有关参数对换热器性能的影响,并结合最优排气压力,研究使系统高效运行的方法,为气冷器的优化设计提供了基础。 相似文献
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