窗式直接蒸发冷却器在干燥地区居住建筑的应用研究

为了对室内空气降温的同时增加大量新风的补充,采用直流式全新风模式的蒸发冷却空调给室内降温。对使用窗式直接蒸发冷却器降温的新疆乌鲁木齐市天山区某住宅房间送风温湿度进行测试,数据表明,进风口温度在29℃,出风口温度为22℃,湿球效率为72%,室内温度稳定在25℃,相对湿度为59%,温湿度满足舒适性要求。     

多级蒸发冷却在化工厂变频器室通风降温的应用

介绍传统变频器室的降温方式以及多级蒸发冷却技术的特点,并以贵州福泉某变频器室为例,进行多级蒸发冷却通风降温设计,通过与传统机械全面通风降温及单元式空调柜机降温方案进行比选,可以得出多级蒸发冷却通风降温系统在节能方面和运行投资方面均具有很大的优势,为该系统在贵州地区的应用提供技术参考.     

适用于夏热冬冷地区的空调节能系统

介绍几种空调系统节能措施,并根据夏热冬冷地区气候条件,提出该地区空调系统节能的总体构想,即利用蒸发冷却、除湿机和机械冷却相结合,以达到空调系统节能的效果.     

榆林地区大中型商场蒸发冷却空调系统设计分析

以榆林某大型商场为例,对该商场使用蒸发冷却空调系统的设计方法进行研究,对蒸发冷却空调与传统机械制冷空调的优缺点进行对比,给出了具体的空调送风量数值、空调末端的送回风形式确定以及空调机房的设备布置和配管方式;并将适用于高温空调的层式通风方式与蒸发冷却空调系统结合,希望能够促进蒸发冷却在榆林乃至西北地区的推广应用。     

蒸发冷却空调地铁站应用的可行性分析

对地铁站的空调通风特点及建筑环境状况进行了分析总结,得出我国现行地铁站空调通风系统耗能大、空气品质不佳等问题,通过对我国现行地铁站空调通风系统的现状与蒸发冷却空调自身特性以及国外此方面实际应用效果的比较得出,若将蒸发冷却这种节能、环保的空调应用于干燥、中湿度地区的地铁站(湿度地区辅助应用),可以较好地解决现行地铁站空调...     

复合式太阳能空调优化方案

出了融除湿、蒸发冷却、压缩制冷及太阳能热水为一体的复合式太阳能空调的优化方案。分析比较了三种空气处理方案。结果表明 ,与常规空调相比 ,优化方案节电近 4 7%。     

再循环蒸发冷却技术及其在空调行业的应用探讨

文章提出了一种再循环蒸发冷却流程，根据此流程设计了一套再循环蒸发冷却装置，并计算分析了它的冷却效果。对再循环蒸发冷却技术在空调行业的应用进行了探讨，提出了相应的系统应用方法。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。     

降膜蒸发冷却复合传热传质研究

建立了描述叉流式降膜蒸发传热传质过程的数学模型,对气相微分中利用积分法求解,导出确定气液界面温湿度的数学表达式。计算与实验结果对比基本一致。对叉流式降膜蒸发冷却进行深入分析表明,该冷却手段可使处理空气的最低温度接近或达到空气的湿泡温度,得到叉流式蒸发冷却脱身人气流温湿度分布曲面及气液界面温度分布曲面,表明典型工况下,叉流直接蒸发冷却器可使处理空气温度１０℃左右。     

蒸发冷却空调技术在住宅建筑中的研究进展

介绍蒸发冷却空调技术在住宅领域的研究进展。主要包括:直接蒸发冷却空调技术在住宅建筑的应用、间接蒸发冷却在住宅建筑的应用以及蒸发冷却与其他技术相结合在住宅建筑领域的应用几个部分。参考国内外相关文献及其专利,得出蒸发冷却空调技术在部分地区住宅领域应用效果较好的结论,特别是将蒸发冷却空调技术与其他技术相结合的应用过程中,这项技术能够提高整个机组的运行能效比,使机组运行更加节能、环保。在广阔的农村住宅领域以及"干空气能"丰富的部分地区,蒸发冷却空调技术值得被大力推广。     

辐射冷却技术与住宅空调

本文从住宅空调的自身特点、居住环境与健康的角度分析了辐射冷却技术在居住建筑中的应用。尽管辐射冷却技术在节能方面较为先进,但仍存在一定的局限性,如夏季空调运行期间室内冷却壁面结露的可能性增大、住户无法根据需要随意调控和开窗进行自然通风,在我国高热高湿地区的住宅建设中应慎重采用。     

Enhancement of Performance and Energy Efficiency of Air Conditioning System Using Evaporatively Cooled Condensers

This paper presents an experimental investigation of the reduction of energy consumption in a split air-conditioning system employing evaporative cooling of ambient air flowing over the condenser coil. Direct evaporative cooling is employed at the air-cooled condenser of a split air-conditioning system to cool the air flowing over the condenser coils. Different ambient conditions of air were simulated using a heater to mimic typical high temperature environments. The effect of the cooling pad thickness on the performance of the system was investigated by varying the pad thickness from 5 cm to 15 cm in step size of 5 cm. Result shows that the temperature drop experienced by the air is dependent on the thickness of the pad, as well as the condition of the inlet air to the pad. Conditions of the exit air from the pad shows that evaporative cooling can be employed as a stand-alone method for cooling of data centers, with adequate humidity control systems in place, or its output can be used to augment the performance of existing mechanical cooling systems. A decrease in power consumption of the unit is observed, with concomitant increase in coefficient of performance (COP). In addition, results obtained show that up to 44% increase in COP, and a 20% decrease in power consumption can be achieved by employing evaporative cooling. Additionally, the COP was found to increase by about 4% for every 1°C drop in refrigerant condensing temperature. Moreover, a 1°C drop in ambient air temperature causes a drop of 0.6°C in condensing temperature of the refrigerant.     

家用蒸发冷却中央空调的应用研究

针对现有三种技术路线的家用中央空调缺点。结合国情,提出了利用蒸发冷却技术和变风量技术实施分室控制的家用蒸发冷却变风量中央空调的方案。     

Evaluation of plume potential and plume abatement of evaporative cooling towers in a subtropical region

Hong Kong is a typical subtropical region with frequently high humidity in late spring and summer seasons. Plume from evaporative cooling towers, which service air-conditioning systems of civil buildings, has aroused public concerns since 2000 when the fresh water evaporative cooling towers were allowed to be used for high energy efficiency and environmental issues. This paper presents the evaluation of the plume potential and its effect on the sizing of the plume abatement system in a large commercial office building in Hong Kong for practical application. This evaluation was conducted based on a dynamic simulation platform using the typical meteorological year of Hong Kong since the occurrence of the plume heavily depends on the state conditions of the exhaust air from cooling towers and the ambient air, while the state condition of the exhaust air is determined by the total building cooling load and the control strategies of cooling towers employed mainly for improving energy efficiency. The results show that the control strategies have a significant effect on the plume potential and further affect the system design and sizing of the plume abatement system.     

Simulation–optimization of solar-assisted desiccant cooling system for subtropical Hong Kong

Solar cooling is a novel approach, which primarily makes use of solar energy, instead of electricity, to drive the air-conditioning systems. In this study, solar-assisted desiccant cooling system (SADCS) was designed to handle the cooling load of typical office in the subtropical Hong Kong, in which half of the building energy is consumed by the air-conditioning systems. The SADCS mainly consisted of desiccant wheel, thermal wheel, evaporative coolers, solar air collectors and gas-fired auxiliary heater, it could directly tackle both the space load and ventilation load. Since the supply air flow is same as the outdoor air flow, the SADCS has a feature of sufficient ventilation that enhances the indoor air quality. Although it is inevitable to involve the auxiliary heater for regeneration of desiccant wheel, it is possible to minimize its usage by the optimal design and control scheme of the SADCS. Through simulation–optimization approach, the SADCS can provide a satisfactory performance in the subtropical Hong Kong.     

水环热泵空调系统应用性分析

水环热泵空调系统是小型水／空气热泵机组的一种应用。通过连通建筑物周边区和内区的水循环环路将小型水／空气热泵机组并联在一起,形成一个封闭环路,将建筑物内区制冷产生的冷凝热转移到周边区,作为周边区热泵的低温热源。水环热泵空调系统在对建筑物内区供冷的同时实现对周边区供热,使建筑物空调的内、外区冷热相抵,建筑物内部余热得到充分利用,节约了能源。本文比较了水环热泵系统相对于常规空调系统在系统结构、节省能源等方面的优势和应用中遇到的问题,并结合工程应用实例,分析了水环热泵空调系统的经济性。     

Optimization of Water Consumption in Hybrid Evaporative Cooling Air Conditioning Systems for Data Center Cooling Applications

In the light of its potential to reduce energy consumption when coupled to the condenser of existing vapor compression systems, evaporative cooling technology still faces questions relating to its water consumption pattern and the effect of water quality on its performance. This paper presents an experimental investigation of the water consumption characteristics in a split air-conditioning system employing evaporative precooling of air flowing over the condenser coils. The effect of the cooling pad thickness on the coefficient of performance of the system is investigated by varying the pad thickness from 5 to 15 cm in step size of 5 cm. Condition of the exit air from the pad shows that evaporative cooling can be employed as a standalone method for cooling of data centers, with adequate humidity control systems in place. Results obtained on water consumption shows that the volume of water consumed does not increase proportionally with time, rather it increases by a factor of 1.8, 2.5, and 3.2, for 2, 3, and 4 hours of operation respectively, relative to 1hour of operation. Two parameters; salinity and turbidity were used to study the effect of water quality on the evaporative cooling process. Additionally, a method of optimizing the pump operation is introduced in this paper. Running the pump intermittently could cut the energy consumed by the water pump in such a hybrid system by up to 20%.     

地铁空调通风环境控制系统的节能探讨

针对地铁空调通风系统的负荷特点，提出了控制新风量、变频调速、设置冰蓄冷集中供冷站、目标温度控制以及自动化运行管理等节能技术和措施，并对这些方案进行了经济性分析。     

Thermal performance of an evaporatively cooled building: Parametric studies

A single-storey office building in a hot and dry climate is modelled for evaporative cooling. The counterflow cooling tower is modified to precool the tower inlet air by the tower exit air in a heat exchanger. Centralized evaporative air cooling, using the modified cooling tower, and roof evaporative cooling are considered to provide comfortable living conditions in the space. The thermal performance of such a building is analysed for various operating parameters. The study indicates that centralized evaporative air cooling is feasible, to maintain near-perfect comfort conditions in hot and dry climates. Modified cooling tower and roof evaporative cooling further enhance the scope of evaporative cooling for comfort applications.