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为保证大型天然气液化(LNG)用板翅式换热器冷箱安全、可靠运行,建立了大型LNG冷箱内板翅式换热器的板翅结构热应力有限元分析数学物理模型,基于热弹性理论采用热-结构直接耦合方法分析了运行参数(流体温度、外载荷以及操作压力)对LNG板翅结构等效热应力的影响规律,模拟结果表明:天然气和混合冷剂之间温差越大板翅结构承受最大等效热应力越大,混合冷剂和天然气温度越低其最大等效热应力越大;外载荷为压力时压力越大其最大等效热应力越小,外载荷为拉力时拉力越大其最大等效热应力越大;此外,天然气侧压力对热应力的影响大于混合冷剂侧压力对其影响,但均表现出增大趋势。上述研究成果将为大型LNG冷箱内板翅式换热器结构以及运行参数设计和安全可靠运行提供重要参考依据。 相似文献
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板翅式换热器以其传热效率高、温度控制性好、结构紧凑、轻巧、经济性好等突出优点,在航空、制冷空调、空气分离等领域得到越来越广泛的应用。通过CFD模拟分析方法来优化板翅式换热器内几何结构参数。利用数值模拟的方法研究给定质量流量的液氨流过指定板翅式换热器时的压降和传热特性,并总结出对影Ⅱ向流体流动特性与传热特性的部分区域进行结构优化设计的方法。 相似文献
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针对装载机液力传动散热器寿命短、可靠性差的难题,本以散热器适应性分析为基础,介绍了板翅式换热器和缠绕翅片管式散热器的特点和用于装载机液力传动系统热的结构参数及散热效率测试结果。 相似文献
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工程机械用板翅式换热器在工作过程中,尤其在具有振动的工况下,经常会出现泄漏现象。为了防止这种现象的发生,减少维修和停机时间,应严格控制板翅式换热器各制造工序的工艺要求,确保产品质量。(1)必须严格控制原材料的质量。保证人厂的原材料符合有关规定及标准,所有材料均应具有材料生产厂的材质证明书。(2)下料过程中,翅片、导流片、封条、隔板、侧板的尺寸偏差和形位公差应严格按照JB/T7261-94《铝制板翅式换热器技术条件》执行。(3)必须彻底清洗工件表面的油污、锈斑和氧化膜。在酸液中进行清洗的过程中,当… 相似文献
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板翅式换热器用于空调系统排风能量回收的研究 总被引:4,自引:2,他引:4
板翅式换热器有良好的传热性能和较高的紧凑性指标,多年来在空分行业得到广泛的应用,而在制冷和空调领域却用得很少。作者在实验研究的基础上作出了将板翅式换热器用于空调系统排风的能量回收的分析,结果表明节能效果良好。 相似文献
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在空调条件下研究了板翅式换热器用作表面式冷却器和加热器时的传热与阻力特性,根据热力学第二定律运用(火用)分析了换热器的热力过程. 相似文献
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《Energy and Buildings》2005,37(4):325-331
This paper presents selected results obtained by experimental investigation and modeling of flow and heat transfer processes, considering heat exchanger built within an originally developed concept of a household furnace, with convective canals. High efficiency, low emission, firing of both low- and high-rank solid fuels, considerable energy savings, as well as a pleasant heated ambient could be considered as advantages of the furnace. The flue gas-to-water heat exchanger is aimed for heating of water and ambient air in residential compartments. Experimental results show that the heat exchanger has significant influence on increase of the furnace total efficiency. Numerical model of the heat exchanger has been developed, for it is neccesary to obtain reliable data also for the cases not supported by experiments. Predicted values of outlet temperatures of cooling water and flue gases have been compared to the corresponding measured values. Operation characteristics of furnace and heat exchanger could be optimized by combining long-term testing and numerical modeling. 相似文献
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从提高板式换热器的传热效率、降低阻力、选用板片材质、选用橡胶密封垫材质及安装方式等方面,对提高板式换热器效能的优化设计进行了探讨。 相似文献
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通过改变换热器的结构形式和流程,设计了一种椭圆螺旋管束换热器,理论分析了该换热器传热效率提高的原因。试验测试的结果表明,椭圆螺旋管束换热器总传热系数高于普通换热器的总传热系数,且加工成本降低,换热器体积减小,是换热器发展的一个新方向。 相似文献
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The exergy output rate and exergy efficiency performances of an endoreversible intercooled regenerative Brayton cogeneration plant are optimized based on the model which is established using finite time thermodynamic in Part 1 of this paper. It is found that the optimal heat conductance allocation of the regenerator is almost zero. When the total pressure ratio and the heat conductance allocation of the regenerator are fixed, it is shown that there exist two optimal intercooling pressure ratios, and two optimal groups of the heat conductance allocations among the hot-, cold- and consumer-side heat exchangers and the intercooler, which correspond to a maximum dimensionless exergy output rate and a maximum exergy efficiency. When the total pressure ratio is variable, there exist two optimal total pressure ratios which correspond to a double-maximum dimensionless exergy output rate and a double-maximum exergy efficiency, also the corresponding exergy efficiency and exergy output rate are obtained. The effects of the total heat exchanger conductance and the consumer-side temperature on the double-maximum dimensionless exergy output rate and the double-maximum exergy efficiency are discussed. It is found that there exists an optimal consumer-side temperature which correspond to a thrice- maximum dimensionless exergy output rate, and the intercooling process is not necessary by taking exergy efficiency as the objective when the consumer-side temperature is high. 相似文献
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