Yueheng Wang , Yuzhang Wang , Haozhe Sun , Jiao Li , Houqi Wei , Hongliang Hao
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The experimental system can control the water and air flow rates and can measure the water and air temperatures as well as the pressure loss. A comprehensive thermodynamic analysis of the effectiveness of the parameters such as water–air ratio and inlet water temperature had been carried out with the help of a one-dimensional simulation model, which is optimized by the experimental results. Compared to traditional packing humidifier, the aftercool-humidifier can reduce the equipment volume by 42.4% while achieving similar humidification performance. Limitation of the flooding velocity has been overcome. Under the condition of ensuring humidification performance, the maximum flow rate of the working fluid is increased by 24.7%. By analyzing the saturation line and the operating line in the temperature-enthalpy diagram, it is found that the aftercool-humidifier provides stronger mass transfer driving forces than the traditional one. Research on the effectives of inlet parameters showed that the water temperature has a greater impact on the outlet humidity of the aftercool-humidifier than the water–air ratio. Higher inlet water temperature significantly promotes the humidification performance, similar to the mechanism of traditional humidifiers. By analyzing the exergy loss of the aftercool-humidification process, it is found that conditions with higher inlet water temperatures result in lower exergy losses and higher exergy efficiency. Under the same water--air ratio conditions, the aftercool-humidifier achieves an exergy efficiency of 73%, compared to 58.7% for traditional packing humidifiers.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 124994"},"PeriodicalIF":6.1000,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Performance study of integrated aftercool-humidifier based on surface foaming hydrophilic modification\",\"authors\":\"Yueheng Wang , Yuzhang Wang , Haozhe Sun , Jiao Li , Houqi Wei , Hongliang Hao\",\"doi\":\"10.1016/j.applthermaleng.2024.124994\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Humid Air Turbine (HAT) cycle is high efficiency, flexibility and low NOx emissions, making it particularly well-suited for distributed energy resources (DERs) systems. 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By analyzing the exergy loss of the aftercool-humidification process, it is found that conditions with higher inlet water temperatures result in lower exergy losses and higher exergy efficiency. 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引用次数: 0
摘要
潮湿空气涡轮机(HAT)循环具有高效率、高灵活性和低氮氧化物排放的特点,特别适用于分布式能源资源(DER)系统。为了满足 DER 的调节要求,有必要有效降低 HAT 循环的体积惯性和热惯性,从而提高其灵活性。本研究基于表面改性技术,利用加湿器内表面的亲水多孔介质,优化设计了一种创新的集成式后冷却加湿器。后冷却-加湿器集成实验系统采用水平同轴管结构设计,通过三级喷淋实现加湿过程。实验系统可控制水流和空气流速,并可测量水温和空气温度以及压力损失。借助一维仿真模型,对水气比和进水温度等参数的有效性进行了全面的热力学分析,并根据实验结果对其进行了优化。与传统的填料加湿器相比,后冷却加湿器在实现类似加湿性能的同时可减少 42.4% 的设备体积。克服了淹没速度的限制。在确保加湿性能的条件下,工作流体的最大流速提高了 24.7%。通过分析温度-焓值图中的饱和线和工作线,发现后冷却加湿器比传统加湿器提供了更强的传质驱动力。对入口参数影响的研究表明,水温比水气比对后冷却加湿器出口湿度的影响更大。较高的进水温度能明显提高加湿性能,这与传统加湿器的机理相似。通过分析后冷加湿过程的能量损失,可以发现进水温度越高,能量损失越小,能量效率越高。在相同的水气比条件下,后冷却加湿器的放能效 率为 73%,而传统填料加湿器的放能效率为 58.7%。
Performance study of integrated aftercool-humidifier based on surface foaming hydrophilic modification
Humid Air Turbine (HAT) cycle is high efficiency, flexibility and low NOx emissions, making it particularly well-suited for distributed energy resources (DERs) systems. In order to meet the regulation requirements of DERs, it is necessary to effectively reduce the volumetric inertia and thermal inertia of HAT cycle, thereby enhancing its flexibility. An innovative integrated aftercool-humidifier based on surface modification technology, utilizing hydrophilic porous medium on the internal surface of the humidifier, was optimally designed in this study. An integrated aftercool-humidifier experimental system is designed with a horizontal coaxial-tube structure, and the humidification process is achieved through three-stage spraying. The experimental system can control the water and air flow rates and can measure the water and air temperatures as well as the pressure loss. A comprehensive thermodynamic analysis of the effectiveness of the parameters such as water–air ratio and inlet water temperature had been carried out with the help of a one-dimensional simulation model, which is optimized by the experimental results. Compared to traditional packing humidifier, the aftercool-humidifier can reduce the equipment volume by 42.4% while achieving similar humidification performance. Limitation of the flooding velocity has been overcome. Under the condition of ensuring humidification performance, the maximum flow rate of the working fluid is increased by 24.7%. By analyzing the saturation line and the operating line in the temperature-enthalpy diagram, it is found that the aftercool-humidifier provides stronger mass transfer driving forces than the traditional one. Research on the effectives of inlet parameters showed that the water temperature has a greater impact on the outlet humidity of the aftercool-humidifier than the water–air ratio. Higher inlet water temperature significantly promotes the humidification performance, similar to the mechanism of traditional humidifiers. By analyzing the exergy loss of the aftercool-humidification process, it is found that conditions with higher inlet water temperatures result in lower exergy losses and higher exergy efficiency. Under the same water--air ratio conditions, the aftercool-humidifier achieves an exergy efficiency of 73%, compared to 58.7% for traditional packing humidifiers.
期刊介绍:
Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application.
The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.