西安某办公楼蒸发冷却半集中式空调自控系统设计方案

以西安某办公楼为研究对象,提出了蒸发冷却半集中式空调系统即干工况风机盘管+蒸发冷却新风机组自控系统的设计方案,将蒸发冷却空调的具体应用和自动控制紧密的结合起来,保证了系统的安全和最佳节能效果。     

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。     

基于蒸发冷凝技术的地铁车站“无塔冷却”直膨空调系统应用分析

为了解决传统通风空调系统在地铁应用中存在的土建投资大、能效低、运行费高、冷却塔对地面景观及人居环境影响大等诸多问题,提出了一种基于蒸发冷凝技术的“无塔冷却”直膨空调系统,该系统具有“无塔冷却,环境友好;系统简约,节能高效;智能控制、安全可靠”等显著特点。以华东某市地铁工程实际应用为例,对“无塔冷却”直膨空调系统和传统地铁空调系统进行全面对比分析。     

从南迪普电厂实例谈直接蒸发冷却空调的影响因素及应用

从巴基斯坦南迪普电厂直接蒸发冷却空调实际使用效果同设计结果有较大差异入手,分析了存在差异的原因,进而提出了直接蒸发冷却空调可能的优化措施,并展望了直接蒸发冷却空调的应用前景。     

蒸发冷却技术在空调节能中的应用

介绍了近年来国内外对蒸发冷却技术的研究状况,分析了蒸发冷却技术应用在空调中的各种形式和节能效果。指出,蒸发冷却技术在我国东部地区和西部地区均有着广阔的应用前景。     

高湿度地区某整理车间蒸发冷却空调系统设计分析

江阴市某纺织品整理车间设计空调系统,对车间进行降温,改善工人工作环境。针对达到规范所要求的室内温湿度和适当放宽室内温湿度(在人体舒适区域内)时,提出蒸发冷却与机械制冷相结合的空调方案及蒸发冷却空调方案,并根据各自方案的特点、风量及制冷量等情况,得出应用蒸发冷却空调的可行性,最后根据此车间的特点,对方案进行优化,使得蒸发冷却与工位送风相结合,初投资和运行费用更低、节能效果更加显著。     

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...     

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.     

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。     

Performance evaluation of a solar-powered flat-plate multichannel liquid desiccant air conditioning system

There has been a limited application of liquid desiccant (LD) dehumidification systems in space air conditioning until now. The key elements responsible for this restricted implementation are leakage of desiccant solution, corrosion of components, and solution carryover along with the processed air to the space to be conditioned. To remove these problems, an evacuated tube solar heat collector-driven multichannel liquid desiccant air conditioning system has been proposed and experimentally investigated. In this study, dehumidification and regeneration rate, their effectiveness, cooling effect of the dehumidifier, and indirect evaporative cooling unit have been analyzed. The results obtained indicate that the process air has been dehumidified and cooled by 6.32 g kg⁻¹ and 5.26°C, respectively. The regeneration rate and effectiveness have been obtained to be 0.26 g s⁻¹ and 0.31, respectively. In terms of the cooling effect, the system output of 0.703 and 0.130 kW has been obtained from the dehumidifier and indirect evaporative cooling unit of the system, respectively. The proposed system validates the possibility of the novel solar-powered liquid desiccant air conditioning system concept and provides growth and development of the LD air conditioning technology for space air conditioning.     

Numerical investigation on the heat and mass transfer in a direct evaporative cooler

A simplified mathematical model is developed to describe the heat and moisture transfer between water and air in a direct evaporative cooler. The mass of evaporated water is treated as a mass source of air flow, and the related latent heat of water evaporation is taken as a heat source in the energy equation. The momentum caused by water evaporation is taken into account in the momentum equations. The effective air viscosity and diffusion coefficient are decided experimentally. The models and methods are validated by comparing the numerical results with those of experiment for the same evaporative cooler. The influences of the inlet frontal air velocity, pad thickness, inlet air dry-bulb and wet-bulb temperatures on the cooling efficiency of the evaporative cooler are calculated and analyzed.The cooling effects of the direct evaporative cooler are predicted for use in four different regions in northwest China using the present numerical method and local weather data for air conditioning design. The predicted results show the direct evaporative cooler with high performance pad material may be well applied for air conditioning with reasonable choices for the inlet frontal velocity and pad thickness.     

Use of liquid desiccant cooling to improve the performance of vapor compression air conditioning

A hybrid air conditioning system, which consists of sections of desiccant dehumidification, evaporative cooling and vapor compression air conditioning, has been established in this paper. Experimental investigation demonstrates that cooling production and COP of the new hybrid system can be increased significantly, if they are compared with those of vapor compression system (VCS) alone. Assuming that the outlet temperature and humidity of the system are constant, psychrometric analysis at ARI conditions has been conducted under three different cases. The benefits are represented by lower electricity consumption of the compressor, higher COP of the system, less flow rate of condensation air, and reduced size of VCS, etc. The reason that the hybrid system is superior in performance to conventional systems lies in that desiccant dehumidification and evaporative cooling changes the inlet states of the air entering into VCS. Furthermore, the effects of dehumidification and evaporative cooling are analyzed in the paper.     

Desiccant solar air conditioning in tropical climates: I—Dynamic experimental and numerical studies of silicagel and activated alumina

This paper presents a dynamic study of moist air dehumidification in view of its use in an air conditioning process by evaporative cooling in tropical climates. A special device has been built to study dehumidification of tropical-like inlet air, through a fixed compact bed of silicagel and activated alumina. The compact desiccant storage is composed of two parallel beds to reduce the pressure drop. A good agreement is obtained for our experiment, and the computed amount of cycled water from the numerical model in the adiabatic process. This analytical model is used to simulate a complete air conditioning open cycle operating with hot and humid air.     

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%。     

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%.