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两级蒸发冷却空调机组运行中的问题及改进措施 总被引:1,自引:0,他引:1
本文介绍了两级蒸发冷却空调的原理,分析了两级蒸发冷却空调的在实际应用中的优点,针对空调机组实际运行中管式间接段出现的二次风机上方出现较大水雾问题、换热后的喷淋水在接水盘四溅、椭圆换热管出现无淋水、椭圆换热管模块一次出风口出现渗水滴等问题进行分析并提出相应的改进措施,供有关设计、施工及管理人员参考。 相似文献
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国内外蒸发冷却空调技术研究进展(3) 总被引:24,自引:5,他引:19
介绍了多级蒸发冷却空调系统、除湿与蒸发冷却相结合的空调系统、半集中式蒸发冷却空调系统、建筑物被动蒸发冷却技术、蒸发冷却自动控制系统及蒸发冷却水的水质处理。 相似文献
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再循环蒸发冷却技术及其应用 总被引:7,自引:1,他引:6
基于直接蒸发冷却和间接蒸发冷却方法,提出了一种再循环蒸发冷却方法。设计了一套再循环蒸发冷却装置,并通过试验测试了它的冷却效果。对再循环蒸发冷却技术在空调行业的应用进行了具体分析,提出了相应的系统应用设计方法。最后指出这种技术为开发节能环保空调设备和空调系统提供了一个新的途径。 相似文献
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本文介绍了蒸发冷却通风空调机组在发电厂中的主要应用形式和特点,并结合目前蒸发冷却通风空调技术在发电厂中应用的一些实例和国内相关单位的研究加以分析,说明了使用中的实用效果;由于燃气轮机是调峰电厂的主要发电设备,也对蒸发冷却技术在燃气轮机入口降温的应用进行了相关阐述。提出蒸发冷却通风空调技术在适宜地区的发电厂中应用具有切实的可行性和经济性,且应用前景广泛。 相似文献
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为解决地铁站冷却塔设置难题,提出了一种采用低速电机驱动旋转布水装置的间接蒸发冷却器,在两种布置方式下,对其换热性能进行了单因素实验,并运用正交实验法对较优布置方式下影响换热器换热的因素进行了分析。结果表明:两种布置方式下,喷嘴与蒸发冷却器的间距、两组换热管束间距均存在最佳值,喷嘴双侧旋转布水优于单侧旋转布水;换热器平行气流布置且喷嘴双侧旋转布水为较优布置方式,此时,换热器换热量随喷水量、转速、空气速度、冷却水进口温度的增加以及喷水温度、空气温度的降低而增大,其中,冷却水进口温度对换热器换热影响最为显著,其他因素对其换热的影响从主到次顺序为:喷水量、空气温度、空气速度、喷水温度、转速、冷却水流量。 相似文献
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In this paper, numerical analyses of the thermal performance of an indirect evaporative air cooler incorporating a M-cycle cross-flow heat exchanger has been carried out. The numerical model was established from solving the coupled governing equations for heat and mass transfer between the product and working air, using the finite-element method. The model was developed using the EES (Engineering Equation Solver) environment and validated by published experimental data. Correlation between the cooling (wet-bulb) effectiveness, system COP and a number of air flow/exchanger parameters was developed. It is found that lower channel air velocity, lower inlet air relative humidity, and higher working-to-product air ratio yielded higher cooling effectiveness. The recommended average air velocities in dry and wet channels should not be greater than 1.77 m/s and 0.7 m/s, respectively. The optimum flow ratio of working-to-product air for this cooler is 50%. The channel geometric sizes, i.e. channel length and height, also impose significant impact to system performance. Longer channel length and smaller channel height contribute to increase of the system cooling effectiveness but lead to reduced system COP. The recommend channel height is 4 mm and the dimensionless channel length, i.e., ratio of the channel length to height, should be in the range 100 to 300. Numerical study results indicated that this new type of M-cycle heat and mass exchanger can achieve 16.7% higher cooling effectiveness compared with the conventional cross-flow heat and mass exchanger for the indirect evaporative cooler. The model of this kind is new and not yet reported in literatures. The results of the study help with design and performance analyses of such a new type of indirect evaporative air cooler, and in further, help increasing market rating of the technology within building air conditioning sector, which is currently dominated by the conventional compression refrigeration technology. 相似文献
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热管间接蒸发和吸湿冷却空调系统应用分析 总被引:1,自引:0,他引:1
间接蒸发和吸湿冷却在空调系统中得到广泛应用。热毛细泵循环式热管是一种能远距离传输能量且热阻低、传递温降小的高效热交换器。本文介绍了该新型热管用于间接蒸发和吸湿冷却空调系统热回收的工作原理,对该新型热管的原理及运行的毛细极限进行分析。对热管间接蒸发和吸湿冷却空调系统的性能进行模拟和分析。结果表明,热管间接蒸发与吸湿冷却空调系统是一种节能复合空调器系统。 相似文献
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Evaporative cooling has been proved as an effective method of storage of fruits and vegetables of moderate respiration rates. Therefore, a modified evaporative cooler named two-stage evaporative cooler (TSEC) has been developed to improve the efficiency of evaporative cooling for high humidity and low temperature air conditioning. Two-stage evaporative cooler consists of the heat exchanger and two evaporative cooling chambers. The performance of cooler has been evaluated in terms of temperature drop, efficiency of the evaporative cooling and effectiveness of TSEC over single evaporation. The temperature drop through TSEC ranged from 8 to 16 °C. With the several observations for diurnal runs, it was observed that TSEC could drop the temperature up to wet bulb depression of ambient air and provided the 90% relative humidity. Efficiency of single evaporation was 85–90%. Effectiveness of the two-stage evaporative cooling was found to be 1.1–1.2 over single evaporation. The two-stage evaporative cooler provided the room conditions as 17–25 °C temperature and 50–75% relative humidity, which can enable to enhance the shelf-life of wide range of fruit and vegetables of moderate respiration rates. 相似文献
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交通岗亭间接水蒸发开式空调系统 总被引:3,自引:0,他引:3
将间接式水蒸发空调系统用于交通岗亭中 ,分析了系统的热力参数 ,建立了系统的数学模型 ,分析一次气流进口相对湿度及换热器效率对系统加湿量的影响 ,并给出计算例子。 相似文献
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Meteorological enthalpy analysis of temperate and maritime climates above latitude 45°N suggests that the water-side evaporative cooling technique has considerable unrealised potential with contemporary “high temperature” building cooling systems—such as chilled ceilings and displacement ventilation. As low approach conditions are the key to exploiting the cooling potential of the ambient air, thermal performance at such conditions needs to be investigated. To address the research issues, an industrial scale test rig, based on a low approach open cooling tower and plate heat exchanger and designed to maximise evaporative cooling potential, has been constructed. 相似文献
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为了提高间接蒸发冷却器换热效率,提出了将气-水雾化喷嘴应用于间接蒸发冷却器改进换热器表面水膜的均匀性,实验研究了扇形两相(气-水)喷嘴在不同空气压力和水压下的特性,测出了不同压力时喷嘴雾化角和气水质量流量值,得出了其变化规律,确定出了最佳的喷雾气水压力比和雾化角等参数。 相似文献