关于蒸发冷却新风空调集成系统的分析

介绍蒸发冷却空调的基本原理,从对蒸发冷却技术的一些误解和安全、健康、节能方面论述蒸发冷却新风空调集成系统的优点,以及在蒸发冷却空调中的技术难点提出的可行性分析。     

某柴油发动机试验厂房通风降温的数值模拟分析

针对某柴油发动机试验厂房试验过程产生大量余热问题,进行该厂房通风降温方案的数值模拟分析。通过建筑环境和工艺过程建立可供分析的物理模型,选用计算流体动力学的Realizable k-ε模型和组分运输模型作为计算工具。设计了传统的全新风、室外新风蒸发冷却、室外新风蒸发冷却+热污染区环境蒸发冷却三种技术方案进行模拟计算。结果表明,以传统的全新风通风方式尽管能够把室内的热量排出,但未解决人员工作区环境温度超标问题。室外新风蒸发冷却通风方式对比全新风方式,通风量下降31%,可以解决大部分人员工作区环境温度问题。室外新风蒸发冷却+热污染区环境蒸发冷却对比全新风方式,通风量下降43%,可以完全满足人员工作区环境温度要求。     

新风的集中处理与分层处理送风方案的比较

叙述了办公楼或宾馆空调工程,风机盘管加新风系统,新风处理机的设置及其送风系统的形式,经新风的集中处理与分层处理送风方案的比较,笔者认为,按楼层设置新风处理机,即分层处理新风的送风方案,运行调节、管理方便、送新风可靠性强,风道,新风机不占面积,可供先考虑采用。     

蒸发冷却空调新风系统的全年应用研究

结合干热、严寒或寒冷地区全年气候特点及冬夏季建筑能耗特性,通过逐时新风能耗模拟计算,得到设置热回收装置的全年用蒸发冷却空调系统冬季新风节能量远大于夏季节能量,选用热回收装置时应重点关注冬季热回收效率,各类热回收装置中转轮热回收装置全年节能量最大,节能效果最好。基于此,深入分析了蒸发冷却空调系统冬夏季新风加湿需求、新风量变化范围和水系统管径选择,给出了全年用蒸发冷却空调机组冬季运行的防冻措施。     

基于直接蒸发冷却技术的新风换气机

新风换气机作为一种新型的通风换气设备,通过换热芯体回收部分室内排风冷(热)量。为有效提高新风换气机的换热效率,利用直接蒸发冷却原理实验了一种新型新风换气机,即通过增大全热交换芯体处冷热气体的换热温差提高换热效率的换气机。     

独立新风系统(DOAS)研究(2):设计方法

介绍了低温送风独立新风系统的组成及全热交换器、新风机组、末端设备、风道的设计计算，分析了其热湿平衡，给出了一个工程设计实例。     

间接蒸发冷却用于空调新风预冷的实验研究

从温差换热驱动势和吸湿驱动势出发,分析了间接蒸发冷却换热效率的影响因素,实验研究了新风进口温度、排风进口温度和相对湿度对新风进出口温差和换热效率的影响。     

间接蒸发冷却与冷凝除湿新风系统性能分析

间接蒸发冷却与冷凝除湿新风系统是一种基于蒸发冷却技术提出的新风处理方式,用于减少建筑物内新风量需求较大时,新风处理过程中所需的能耗。本文选取热回收效率、火用利用效率和系统综合性能系数(COP)作为评价指标对组合系统进行实验分析,着重考察了外界环境温度变化对系统运行性能的影响,分析了该系统降温冷却性能和其适应性。系统COP随进口新风干球温度和含湿量的增大而增大。当回风量偏小时系统热回收效率及火用利用效率随新风干球温度和含湿量的增大而增大,较新风量和回风量相等时的变化趋势相反。     

溶液除湿技术蒸发冷却空调系统探讨

本文介绍了溶液除湿与蒸发冷却技术相结合的蒸发冷却新风空调集成系统,氯化锂溶液作为除湿溶液。并详细介绍了其流程,探讨了这一系统特性以及调节方法。以南京夏季室外环境为例,进行实例计算。研究表明,该系统的COP可达0.92,具有良好的发展潜力与应用价值。     

某大学生活动中心多功能剧场暖通设计

结合具体工程实例,通过对比水冷式机组与蒸发冷却式模块机组的优缺点,从节能、节水、节省空间等角度出发,选择适合该工程的蒸发冷却式模块机组,将极大节省冷却水泵的能耗;为了降低过渡季空调机组的风机能耗,选择变风道节能型空调机组,使新风不经换热盘管,减少风管系统阻力;最后对剧场的排烟系统设计进行了介绍。     

Application of desiccant systems for improving the performance of an evaporative cooling-assisted 100% outdoor air system in hot and humid climates

The purpose of this study was to enhance the energy-saving potential of an indirect and direct evaporative cooling-assisted 100% outdoor air system (IDECOAS) by integrating it with either a solid or liquid desiccant system. The desiccant system can be installed either at the scavenger air side of the indirect evaporative cooler (IEC) to enhance its effectiveness or at the primary air side of the IEC to reduce the latent load of outdoor air. The operating energy consumption affected by the location and type of the desiccant unit integrated with IDECOAS was simulated under three different hot and humid climates using TRNSYS 17 integrated with commercial equation solver programme. And then, the most energy-conservative configuration was selected for each climate zone as the proposed system. The simulation results showed that configurations with the desiccant dehumidification unit located upstream of the IDECOAS consume 76–85% less cooling coil energy than those with the desiccant unit located downstream of the IDECOAS. It was also found that the liquid desiccant system saves 21–50% more primary energy than the solid one, when it is integrated with IDECOAS.     

再循环蒸发冷却中再循环风量的实验研究

介绍了一种再循环蒸发冷却技术,其原理是利用一部分经间接冷却处理的空气作为二次空气直接蒸发制取冷水,用冷水反过来间接冷却室外空气。搭建了相应的实验台,针对夏季实际工况条件,实验研究了再循环风量比例对蒸发冷却效率的影响,给出了合适的再循环风量范围。     

蒸发冷却式空调在我国南方地区的应用分析

以广州某3层建筑为例,采用动态模拟方法,详细计算分析了其采用蒸发冷却式空调的可行性和使用蒸发冷却式空调后的节能效果.结果显示,在类似于广州的我国南方地区,可以采用间接利用蒸发冷却式技术的蒸发冷却空调集成系统.     

干燥地区合理空调方式探讨

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。     

国内外蒸发冷却空调技术研究进展(3)

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。     

Investigation of a hybrid system of nocturnal radiative cooling and direct evaporative cooling

In this paper, the results of a study on a hybrid system of nocturnal radiative cooling, cooling coil, and direct evaporative cooling in Tehran have been discussed. During a night, the nocturnal radiative cooling provides required chilled water for a cooling coil unit. The cold water is stored in a storage tank. During eight working hours of the next day, hot outdoor air is pre-cooled by means of the cooling coil unit and then it enters a direct evaporative cooling unit. In this period, temperature variation of the conditioned air is investigated. This hybrid system complements direct evaporative cooling as if it consumes low energy to provide cold water and is able to fulfill the comfort condition whereas direct evaporative alone is not able to provide summer comfort condition. The results obtained demonstrate that overall effectiveness of hybrid system is more than 100%. Thus, this environmentally clean and energy efficient system can be considered as an alternative to the mechanical vapor compression systems.     

A two-stage system of nocturnal radiative and indirect evaporative cooling for conditions in Tehran

In this paper, the results of an investigation on a two-stage cooling system have been studied. This system consists of a nocturnal radiative unit, a cooling coil, and an indirect evaporative cooler. During the night in summer, requisite chilled water for a cooling coil unit is provided by nocturnal radiative cooling and is stored in a storage tank. During the next day, the water in the tank provides chilled water for the cooling coil unit and hot outdoor air passes through two-stages: the cooling coil unit and an indirect evaporative cooler. Three sources provide secondary air for the indirect evaporative cooler. The sources are outdoor air, the air leaving from the cooling coil, and the air leaving from the indirect stage (regenerative). The investigation has been conducted in weather conditions in the city Tehran. The results obtained demonstrate that the first stage of the system increases the effectiveness of the indirect evaporative cooler. Also, the regenerative model provides the best comfort conditions. Therefore, this environmentally friendly and energy-efficient system can be considered as an alternative to the mechanical vapor compression systems.     

间接蒸发冷水机组设计开发及性能分析

基于间接蒸发冷却技术设计了高温冷水机组,其驱动源为室外干空气而非电能,冷水机组的理论出水温度可无限接近进口空气的露点温度。建立了数学模型,并提出了系统的串联冷水流程,以更充分地利用室外干空气的能量。合作开发了第一台间接蒸发冷水机组,通过测试得到了实际机组的性能。最后分析了冷水机组作为湿度独立控制空调系统的高温冷源在中国西部及其他地区的应用。     

蒸发冷却与毛细管辐射供冷复合式空调

本文介绍了蒸发冷却与毛细管辐射供冷的概况,并根据西北地区的气候特点,提出了一种将两者相复合的半集中式空调系统方案,阐述了该方案中蒸发冷却与毛细管辐射供冷相复合的特点,同时指出该空调系统在我国西北地区具有十分广阔的应用前景.