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《建筑热能通风空调》2016,(2)
本文分别对直接蒸发冷却器、管式间接蒸发冷却器和间接-直接蒸发冷却复合冷水机组的性能进行了理论分析,并用实验加以验证。结果表明直接蒸发冷却器的冷却效率不高且送风湿度偏大,空气处理过程为等焓降温(绝热加湿)过程,实际出口空气温度接近进口空气湿球温度;管式间接蒸发冷却器的冷却效率较高,空气处理过程为等湿降温过程,送风温度趋近于进风的露点温度;间接-直接蒸发冷却复合冷水机组的冷却效率高,机组出水温度在室外空气的湿球温度与露点温度之间,其冷幅深的值随室外干湿球温度的波动呈现不稳定趋势,且冷幅高的值较为稳定,在1℃范围内波动,因此采用冷幅高来表征间接-直接蒸发冷却复合冷水机组的出水温度特性。 相似文献
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对典型城市建筑物夏季空调能耗计算,对比国内外直接蒸发冷却空调不同室外气象参数选取方案的实际效果,讨论针对不同地区、室内温度和空调应用场合的室外设计气象参数的优化方案。 相似文献
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设计研发了1种新型蒸发冷却空调机组,对其性能参数变化规律和气候适应性进行了研究。基于蒸发冷却理论,研发了1种将直接蒸发与间接蒸发相结合、多级蒸发冷却的新型蒸发冷却空调机组,通过搭建实验测试平台,对新型蒸发冷却空调机组进风干湿球温度、出风温度进行了测试和分析,得到了出风干湿球温度随室外气候干湿球温度变化而变化的基本规律;然后,根据机组性能参数变化规律以及北京、西安、广州和福州4个城市的气象数据,对其适应性进行了分析。结果表明,在全年制冷期内,典型地区应用新型蒸发冷却空调机组出风温度低于26℃的时间均在94%以上,这表明新型蒸发冷却空调机组作为承担显热负荷的技术手段,可适用于我国绝大部分城市;特别对于湿度要求不高的场合,可全年采用该类空调机组实现制冷,节能潜力显著。 相似文献
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《建筑热能通风空调》2017,(10)
本文对常用的几种蒸发冷却水机组的结构类型进行总结,并对这几种蒸发冷却冷水机组的参数进行了对比,最后进行实验数据分析,得出表冷间接-直接蒸发冷却冷水机组,管式间接-直接蒸发冷却冷水机组,露点间接-直接蒸发冷却冷水机组的出水温约为16~18℃,满足温湿度独立控制空调系统中的要求。 相似文献
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This paper explores the potential of reducing the annual energy consumption of a central air-conditioned building through advanced evaporative cooling systems. The building considered is a typical three floor library building of a University. The regenerative evaporative cooling technology is coupled with the liquid cooled water chiller system to accomplish the energy conservation objective. Comparisons of the regenerative evaporative cooling are made with simple evaporative cooling to bring out the importance such a system. The well-known building simulation software, TRNSYS is used to carry out the heat load calculations and the dynamic simulations of the building. Annual energy consumptions of different components of the air-conditioning system are estimated for the existing water chiller system as well as for both coupled evaporative cooling systems (simple and regenerative). The annual energy consumptions, the indoor temperature, the relative humidity and the thermal comfort index ‘PMV’ are compared for all the three different air-conditioning systems. The coupling of direct and regenerative evaporative cooling technologies with water chiller system has shown, respectively, 12.09% and 15.69% savings in annual energy consumption of the building, while maintaining PMV between ?1 and +1 for most of the hours in the year. 相似文献
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根据长江流域高温高湿的气候条件,构建了两级蒸发冷却与溶液除湿相结合的复合空调系统。介绍了复合空调系统的流程,根据该地区的气候条件和相关的空调设计参数,比较了复合空调系统与一次回风空调系统的能耗。在设计工况下,复合空调系统的能效比为2.6,相比于一次回风空调系统的节能率为47.2%。 相似文献
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A theoretical study of the feasibility of evaporative cooling of the condenser air of a conventional vapour compression air-conditioning system to upgrade the rating of an air-cooled air-conditioning unit and consequent energy saving in the Delhi climate is presented. A brief review of the heat rejection option in an air-conditioning unit has been given and a theoretical background analysis for evaporative cooling of condenser air has also been presented. For illustration, one specific air-cooled package unit, whose performance characteristics as given by the manufacturers are available, has been used for calculations. Temperature variation data for New Delhi in the months of May and June 1991, obtained from the Meteorological Department, has been used. With the basic data, the upgradation of cooling capacity, power requirement and average energy consumption with and without evaporative cooling of condenser air has been calculated and the reduction in peak load and saving in the average energy consumption was predicted. Typical calculations of the water requirements for pre-cooling of condenser air were also predicted and compared with the corresponding requirements for water-cooled and evaporative condensers. It is concluded that there is an excellent and exciting possibility of reducing energy consumption (and consequent enhanced energy saving) in air-conditioning at national level. 相似文献
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蔡亚桥 《建筑热能通风空调》2014,(2):90-92
依据地铁车站空调系统的运行特点,结合地铁车站新、排风井的设置原则,指出地铁车站的冷却塔、蒸发式冷水机组、蒸发式冷却塔、多联机室外机等空调系统的散热设备放在地下是可行的,该方法对于地铁车站地面冷却塔等散热设备长期以来与地面占地征用协调困难、与城市景观不协调、噪音扰民等矛盾的解决具有一定的借鉴意义。 相似文献
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本文介绍了蒸发冷却空调系统在干燥地区的应用,阐述下送风的特点,在此基础上提出干燥地区最佳空调系统为全空气空调系统的蒸发冷却空调机组与送风方式为下送风变风量VAV系统的组合,这对改善室内空气品质、节能等都具有明显的效果。 相似文献
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对填料在蒸发冷却和溶液除湿等空调领域的国内外研究进展进行了阐述,并分析了影响填料型空调系统的因素,提出了提高填料型空调系统性能的建议,以推广填料在空调领域的应用。 相似文献
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