布袋除尘器的酸露点

用布袋除尘器处理高湿气体时,若袋室内气体温度下降到露点,就会引起除尘器潮湿,甚至造成堵塞,最难处理的是布袋除尘器中的酸露点。当气体中含有SO_x时,露点温度显著提高,被称之为酸露点(以区别于通常的露点),并知道酸露点温度在150℃～200℃范围内。过去用计算方法求酸露点是很困难的,但是美国Notre Dame大学的J. T. Banchero等人研究了很多实验数据并根     

建筑热环境模拟分析用逐时相对湿度生成方法

分别采用对4次相对湿度、4次含湿量、4次露点温度以及4次湿球温度进行直线插值或3次样条插值等8种计算方法生成的逐时相对湿度,从统计学和能耗模拟两个角度,与实测值进行对比分析。分析结果表明,由4次含湿量（或露点温度）进行线性插值计算生成的逐时相对湿度与实测相对湿度吻合较好;并据此给出了由逐时相对湿度根据关联性计算生成逐时含湿量、湿球温度、露点温度的方法。     

露点蒸发冷却技术的发展及其在数据机房冷却中的应用

露点蒸发冷却可以将空气温度降至进口空气湿球温度以下,理想状态下可达到进口空气的露点温度。露点蒸发冷却器冷却性能受湿通道内表面润湿材料、冷却器结构及运行参数影响。概述了露点蒸发冷却器在湿通道材料选择、冷却器结构及运行参数优化方面的研究现状及研究进展,以及其在数据机房冷却中的不同应用形式。     

一种可除湿的空气处理机

沿海地区出现低温高湿天气 (温度在 10～ 16℃、相对湿度在 84 %～ 94 % )的时间较多 ,如在广东 ,这种天气的年出现率为 30 %左右 ,虽然这种气象条件下无需降温 ,但是那些对湿度要求较严的电子产品生产车间、精加工车间、精密测量仪表室要进行除湿处理。笔者所在公司生产车间对     

ZM-890型中空玻璃密封胶通过省级鉴定

由河南省科学院化学研究所与永昌化工厂共同研制成功的 ZM-890型中空玻璃密封胶于1990年10月通过了省级鉴定并投入批量生产。该胶系双组份室温固化聚硫橡胶型。用该胶制作的中空玻璃具有露点低、密封性好、耐紫外线辐射、耐高温高湿、耐老化等特点,经国家玻璃质量     

内置格栅逆流式露点蒸发冷却器性能的数值研究

为提高逆流式露点蒸发冷却器的冷却效率,对冷却器进行了结构优化设计,提出了新型的内置格栅的露点蒸发冷却器。建立了描述冷却器内部热湿传递过程的二维数值模型,通过求解数值模型比较了5种结构的露点蒸发冷却器在不同入口空气温湿度、入口空气速度和二次/一次空气风量比条件下的冷却效果。模拟结果表明,内置双层格栅的露点蒸发冷却器(模型E)能有效改善干通道中一次空气分布不均匀的情况,大幅提高了冷却效率。与不含格栅的普通露点蒸发冷却器(模型A)相比,在入口空气温度(25～45℃)和含湿量(6.9～14.5 g/kg)条件下,模型E的湿球效率提高了10.2%～37.9%;当入口空气速度为1.5～8.5 m/s时,模型E的湿球效率平均提高了17.32%,露点效率平均提高了12.32%;当风量比为0.4～0.6时,模型E的湿球效率平均提高了20.6%,露点效率平均提高了13.6%。     

带冷凝热回收的直流变频恒温恒湿空调机组热湿分控实验研究

基于已有的带冷凝热回收的直流变频恒温恒湿空调机组,提出了一种串级控制的热湿分控方法。为了验证该控制方法的可行性,对机组出风温湿度控制效果和被控房间的温湿度控制效果进行了测试。实验结果表明,采用该控制方法的恒温恒湿机组能满足实验工况下的热湿控制要求,送风温度控制精度为±0.2℃,送风含湿量控制精度为±0.2g/kg,被控房间的干球温度控制精度为±0.04℃,被控房间的露点温度控制精度为±0.02℃。     

大空间工业厂房围护结构结露区域预测方法

应用FLUENT软件获得高温高湿造纸工业厂房内部温湿度及围护结构内表面温度分布。在Tecplot后处理软件中编写代码,拟合出空气露点温度分布。对比围护结构内表面温度与其附近空气露点温度,根据结露判断条件预测出围护结构内表面结露区域分布。为大空间工业厂房设计、维护人员等预测结露区域,加强围护结构保温防结露措施提供了参考。     

管道积水引起的天然气焊枪堵塞事件处置

针对某空调公司总装车间出现气焊枪堵塞,经测试天然气管网不同位置的水露点,分析天然气含水量,得出原因是总装车间引入管前埋地管网末端存有积水。对庭院管网进行保压、放散、置换、吹扫,排出庭院管网积水,解决了气焊枪因天然气含水量过高造成的堵塞。     

解决北方地区潮湿车间冬季去雾除湿问题的一种简便方法

关于潮湿车间的除湿问题一直是国内外暖通工作者关注的问题之一。许多生产部门,如印染、制革、造纸、酿造、肉食品加工、浆洗房、豆腐房、厨房……等,在生产过程中都会散发出大量的湿分,这些生产过程的共同特点是对空气湿度控制要求不高,因此,在夏季可以通过采用一些简易的通风方法,如开窗或在侧墙、屋顶安装轴流风机等方法使室内通风降湿。但是,在冬季仅有上述简易通风方法就不够了,因为随着室内     

空调大温差研究(2):空调大温差送风系统设计方法

提出用定露点法计算常规空调大温差系统,逐项介绍了设计步骤;认为定露点法不但可以较准确地控制室内设计参数,掌握室内实际空气状态,而且可以利用计算机,使大温差送风的设计计算更加简捷、直观。强调采用定露点法计算时,单个系统不宜过大,热湿比不同的房间宜采用不同的空调系统,空调机组风量或风压较大时,宜采用风机压出式布置。     

The moisture content distribution of a room with radiant ceiling cooling and wall-attached jet system

Radiant ceiling cooling is a comfortable and energy saving air conditioning system, but condensation on the panels limits its application. The moisture distribution of a radiant cooling room is one of the key factors affecting the condensation of radiant panels. This paper uses a simulation model validated by experimental data to investigate the influence of wall-attached jets on the moisture content distribution of a room with radiant cooling. The influence of diffuser types and air velocities on the moisture content distribution is analyzed in the pre-dehumidification stage. This paper also studies the moisture content distribution and dew point temperature variation of the attached air layer with the cooling system operating with and without pre-dehumidification. The results show that a linear diffuser has a better attach effect, and the moisture content distribution is more uniform. The time it takes to reduce the moisture content to the design value of different diffusers is similar, approximately 25 min. With increasing air velocity and decreasing linear diffuser length, the non-uniformity coefficient (NUC) of the moisture content distribution increases and the pre-dehumidification time becomes longer. When the radiant cooling system operates without pre-dehumidification, the attached layer moisture content is high at the beginning, which may cause condensation in the first 7 min. Pre-dehumidification can decrease the moisture content and dew point temperature and effectively prevent condensation.     

烧结机尾大烟罩除尘系统防结露问题

分析了烧结机尾除尘系统中，除尘器滤料腐蚀的原因，确定了露点温度，论述了除尘系统防止结露的技术措施，即控制烟气的温度高于露点温度，选择了既经济又适合现场条件的方法：保温法＋混入热风直接加热法。     

Experimental investigation of dehumidification process in cooling coil by utilizing air-to-air heat exchanger in humid climate of Iran

Energy recovery systems can be used in HVAC to reduce energy consumption by recovering wasted energy from the exhausted air to pre-cool inlet fresh air. In this paper, experimental study of utilizing cooling coil (CC) and cooling coil combined with heat exchanger (CCHE) has been developed. Considering the different climate zones in Iran, the experimental study has been done for the areas with high humidity content. In each case, the effects of air-to-air heat exchanger (HE) on the sensible and latent cooling load are investigated. The analysis gives the applicability of HE in Iran for various operational conditions to obtain air with lower moisture content. In CCHE systems more latent load quota is allocated in cooling coils and lower air humidity ratio can be obtained. Also in the cities with higher dew point depression (difference between dry-bulb and dew point temperature) more humidity reduction is achieved and the difference between latent load quotas of CCHE system is higher than CC system.     

水冷式表冷器传热研究(6):机器露点表达式的建立

建立了水冷式表冷器冷盘管表面平均热状态在干工况和湿工况下的数学表达式，通过理论和实验分析了各影响因素及影响程度。指出结构特性一定的表冷器，干工况下冷盘管表面平均热状态温度和进风干球温度、冷水初湿成线性关系；湿工况下在空调常用范围内，冷盘管表面平均热状态焓值和进风焓值，冷水初温成线性关系，且两种工况下冷盘管表面平均热状态温度（或焓值）都随迎面风速增大而增大，随水流速增大而减小。     

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。     

Analysis on the ideal energy efficiency of dehumidification process from buildings

As dehumidification is one of the most important tasks of environment control of the building, it is necessary to know the energy efficiency of dehumidification processes. The energy efficiency can give the energy cost of drawing moisture from indoor air to the outside environment. This paper presents analysis of the ideal cost of dehumidification process by a liquid desiccant cycle. Formulas to calculate ideal efficiency of dehumidification process are obtained, which is determined by indoor temperature, outdoor temperature, and the temperature of the intersection point of the iso-relative humidity line of indoor air and the iso-humidity ratio line of outdoor air. The ideal efficiency of the condensing dehumidification method is lower than the ideal dehumidification process, due to the fact that condensing dehumidification method must dehumidify the air at the temperature of dew point. Results from this paper can be used as theoretical foundation for the further analysis of various dehumidification methods and the development of new dehumidification processes.     

纺织厂空调冷负荷计算中的几个问题

分别就锯齿形厂房和无窗厂房，对原围护结构冷负荷计算方法所得结果与冷负荷系数法计算结果进行了比较，二者偏差较大，建议采用冷负荷系数法计算围护结构冷负荷。通过计算分析，得知围护结构冷负荷在车间空调冷负荷中所占比例较小，其计算偏差的影响有限；机器散热引起的冷负荷是构成空调冷负荷的主要部分。对机器散热冷负荷计算中热迁移系数的取值问题进行了探讨。     

Investigation of moisture condensation on papermaking plant envelopes in high humidity environment by orthogonal analysis and CFD simulation

The objective of this study is to investigate the problem of moisture condensation on papermaking plant envelopes in high humidity environment. In this study, orthogonal experiment method is combined with CFD simulation to explore how moisture condensation varies with governing factors, such as the thermal parameters of building envelopes, temperature and humidity distributions or ventilation and air distribution. The criteria used by our work to determine whether the condensation will occur on envelopes are to calculate the temperature differences between the inner surface and the air dew point near the envelopes. Specifically, the temperature differences have a linear relationship with the governing parameters, and a first-order linear regression equation is derived, which is validated by data from investigation and measurement. This research provides theoretical support and measurement data for solutions of the envelope condensation problems and anti-condensation design of HVAC systems in papermaking plants.     

集中式全空气空调系统该如何发展

回顾了家用空调和多联机空调系统的发展过程,认为集中式全空气空调系统的规模化生产是发展的必然趋势,其关键是实现规格化、模块化、系列化。提出了可实现规模化生产的全空气空调系统的模式。该系统可通过优化系统组合,取消二次回风,实现能量的最佳利用和回收,具有系统简洁、安装维护简便,可靠性高等优点。