转轮除湿系统除湿效率及空气净化效率实验研究

搭建了转轮除湿系统实验台,对其除湿性能及去除污染物的性能进行了测试。研究了再生温度、处理空气和再生空气风量、处理空气含湿量对转轮系统的除湿量和除湿效率的影响,同时也研究了再生温度、处理空气和再生空气风量、处理空气含湿量、污染物浓度对污染物净化效率的影响。实验结果显示:转轮除湿系统在除湿和去除污染物方面均具有良好的性能;除湿量、除湿效率及对污染物的净化效率均会随着再生温度的升高而增大;处理空气含湿量越高,除湿效率越低;处理空气风量越大,除湿量、除湿效率及对污染物的净化效率越低;再生空气风量越大,除湿量、除湿效率及对污染物的净化效率越高;当处理空气的相对湿度低于70%时,处理空气相对湿度对污染物的净化效率影响较小,当相对湿度高于80%时,随着相对湿度的增加,污染物的净化效率急剧下降。     

转轮除湿与单元式空调机相结合的空气处理系统

本文介绍了转轮除湿与直接膨胀式单元机组相结合的复合空调系统的2种紧凑型组成形式:前置预冷与后置冷却,并在几种不同室外工况下,针对应用于独立新风系统,对比分析了这2种典型组成方案的性能特点。结果表明,这2种除湿方式在4种典型工况下的制冷能耗相差不明显,在10%以内;但后置冷却除湿在高温高湿工况下难以实现较大的单位除湿量,且再生空气温度高;而前置预冷除湿系统采用较小的除湿转轮尺寸,结构更紧凑,可明显降低初投资,且再生空气温度较低。因此,前置预冷除湿系统在较小流量空气处理应用方面更具优势,更具商品化发展潜力。     

除湿转轮效率研究

分析了目前除湿转轮效率定义存在的问题,提出了一种新的转轮效率定义.建立了一维非稳态氯化锂除湿转轮的数学模型,计算得到了不同再生空气温度、含湿量和不同处理空气温度、含湿量下的除湿转轮的除湿量及效率,并与文献实验结果进行对比,结果较为吻合.当转轮效率取0.85时,计算值与实验值的误差在±20%以内,且大部分值的误差都在±10%以内.     

循环再生转轮除湿系统的理论分析

本文提出一种循环再生转轮除湿系统,利用船舶设备的余热实现舱室的高效除湿,探讨了在不同参数下除湿效果的变化规律。结果表明相比于海水直接冷凝,该转轮除湿系统可有效提高除湿率。随着再生风温度的提高和再生后冷风温度的下降除湿率增加。存在最佳分流系数使得转轮除湿系统的除湿率达到最优值,该系数随着再生风温降的增大而逐渐减小。     

基于PV/T和GHP再生的除湿转轮空调系统的仿真研究

本文建立了基于PV/T和GHP再生的转轮除湿空调系统,构建了除湿转轮子系统仿真模块、燃气热泵子系统仿真模块和PV/T子系统仿真模块,并在此基础之上构建整机系统仿真模块。对不同处理空气流量、处理空气温度、处理空气湿度、转轮转速、太阳光照、发动机转速及有无预冷器的空调系统性能进行了仿真模拟。主要结论有:处理空气风量越大、入口温度越高、入口湿度越小、转轮转速越低则空调系统的除湿量越小;处理空气风量越大、入口温度越高、入口湿度越大、转轮转速越高,则蒸发温度越高,制冷COP越大;发动机转速越大,系统的再生温度越高、送风温度越低、冷凝温度越高、蒸发温度越高、除湿量越大;太阳光照强度越强,系统的除湿量就越大;有预冷器的空调系统除湿量更大。     

溶液除湿空调系统在工业厂房应用的能耗分析

通过对深圳某工业厂房分别选用常规冷凝除湿空调系统和溶液除湿空调系统进行系统设计和理论计算分析,比较了两类空调系统的能耗及COP。在夏季室外设计工况下,常规冷凝除湿空调系统的COP为2.94,溶液除湿空调系统的COP为5.42。室外空气含湿量越小,对提高溶液除湿系统的性能越有利。溶液除湿空调系统在节能方面具有较大的优势。     

一种高效除湿燃气锅炉尾气处理装置的模拟分析

燃气锅炉尾气中大量的水蒸气排放到室外后,增大了局部空气湿度,促进雾霾形成。本文针对一种高效除湿的燃气锅炉尾气处理装置中的烟气温度变化进行CFD模拟和分析,研究在新疆乌鲁木齐冬季时节该装置的除湿性能,以及室外温度及引风量对除湿性能的影响。     

内冷型活性氧化铝及沸石分子筛空气除湿性能实验研究

建设了对吸附装置具有内部冷却功能的内冷型固体除湿空调实验系统,以自制活性氧化铝与沸石分子筛作为固体吸附除湿材料,对内冷固体除湿的性能进行实验研究。讨论了常温低湿、中湿、高湿3种不同进口空气工况对固体除湿性能的影响。结果表明:内冷型固体除湿性能高于绝热型固体除湿,对常温低湿空气,氧化铝内冷比绝热下除湿量高出11.25%,沸石分子筛高出了14.14%。对常温中湿空气,氧化铝除湿量高出22%,沸石分子筛除湿量高出25.45%。对常温高湿空气,氧化铝高出20.4%,沸石分子筛高出了24.9%。且活性氧化铝作为吸附除湿材料无论是在内冷或绝热工况均比沸石分子筛表现出更高的除湿能力。     

热湿地区溶液除湿系统处理空调新风的实验研究

介绍了实验装置,分析了实验数据.结果表明,空气和溶液进口参数相同时,以50?Cl2 50%LiCl混合溶液为除湿剂的系统除湿效率要高于以纯LiCl溶液、纯CaCl2溶液为除湿剂的系统.采用该混合溶液作为除湿剂时,对于不同的室外空气参数,通过调节除湿溶液与空气流量比,均可达到室内湿度要求.     

广东省某胶片涂布干燥除湿方法的探究

针对广东省某胶片涂布干燥室湿负荷大问题,提出了两种除湿方法,一是冷冻除湿法结合冷凝热回收;二是干式除湿法（转轮除湿机与冷冻除湿机联合）结合再生空气排气废热回收。通过对两种除湿方法的对比分析,选定经济节能的除湿方法。     

利用冷凝热再生的复合除湿空调除湿潜力分析

简要描述了利用冷凝热再生的复合除湿空调系统形式及其节能性特点;在热力学第一定律和热力学第二定律的基础上,分别以冷凝器和除湿转轮为控制体,建立了复合除湿空调的系统热力学模型,并给出模型求解框图,从而可以求得复合除湿空调系统的除湿量;最后,计算了在不同转轮效率和室内单位面积显热负荷下的系统单位面积除湿量,并讨论了新风量大小对结果的影响;结果表明,在现有转轮效率和常见单位面积负荷指标下,转轮的除湿量小于新风湿负荷（1次/h）,而降低新风量后（0.5次/h）,当转轮效率较高和室内显热负荷较大时,转轮能够承担新风湿负荷。     

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.     

空压机进气端除湿及润滑油余热利用研究

为了降低空气压缩机吸气温、湿度以有效降低空气压缩机系统能耗,将膜分离技术、液体除湿技术和热泵技术相结合,并充分利用空压机余热,设计了应用于空压机进气端的中空纤维膜液体除湿装置。应用结果表明:采用进气端除湿方法将空压机系统的热负荷与湿负荷分开处理,改善了压缩机的进气条件,降低了压缩过程的功耗,同时为空压机创造了良好的运行环境,降低了空压机的日常运行、维护成本。     

GHP与除湿相结合的复合空调系统

介绍了一种燃气发动机热泵（GHP）与除湿转轮的复合空调系统,夏季将回收的发动机余热用于除湿转轮再生、承担湿负荷;冬季通过排热回收减小空调系统的采暖负荷。对比了复合空调系统、单独使用GHP、电动空调系统的能耗情况。     

民用空调吸附材料的除湿性能研究

选取民用空调常用的两种吸附材料-硅胶和4A分子筛,在实验的基础上,对比分析了硅胶和4A分子筛两种吸附材料的除湿量、吸附能效以及脱附能效,结果表明：4A分子筛在整个吸附阶段都能保持较高的单位除湿量,比较适于二次除湿或深度除湿工作。而硅胶在很快时间内达到吸附平缓值,较适用于表面除湿及一次除湿工作。在相同的吸附和再生条件下,硅胶较4A分子筛有着更高的吸附和脱附能效,因此将硅胶作为民用空调系统的除湿材料较4A分子筛节能效果更佳。     

Energy savings potential of a desiccant assisted hybrid air source heat pump system for residential building in hot summer and cold winter zone in China

In hot summer and cold winter zone in China, air conditioning system has four running modes yearly including cooling with dehumidification, cooling, dehumidification and heating in residential buildings. The conventional air source heat pump (ASHP) system is not designed to independently control temperature and humidity, and is not very suitable for the dehumidification mode in the view of building energy consumption. A novel ASHP system combining radiant cooling/heating for residential buildings was presented. The main feature of this hybrid ASHP system is that desiccant wheel and cooling coil accomplish dehumidification process together, and the regenerative heat needed by the desiccant wheel is supplied by the condenser dissipated heat. Based on simulation studies and performance analysis, this paper predicts the primary energy consumption of the hybrid ASHP system in comparison with the conventional ASHP system during the cooling and heating seasons. It was found that primary energy requirement can be reduced by more than 8% in cooling with dehumidification mode, by 50% in dehumidification mode, and by more than 14% in heating mode. The study results prove that the hybrid ASHP system can keep great energy saving and running cost saving yearly, especially in the dehumidification process.     

Performance analysis of liquid desiccant based air-conditioning system under variable fresh air ratios

In conventional air-conditioning system, fresh air volume is always restricted to save energy, which sacrifices indoor air quality (IAQ) to some extent. However, removing the latent load of air by liquid desiccant rather than by cooling is an alternative way of reducing energy consumption. Therefore, IAQ can be improved by increasing the volume of fresh air introduced into an air-conditioning system. In this paper, a liquid desiccant based air-conditioning system is studied, with the system performance under various fresh air ratios analyzed using simulation tests. In addition, the proposed system and a conventional system are compared. In the proposed system, with the increase in fresh air ratio, the heating load for solution regeneration rises, the dehumidification efficiency increases and the regeneration efficiency drops. The coefficient of performance (COP) of the liquid desiccant based system decreases sharply when the fresh air ratio exceeds 60%. The results also show that the proposed system can save power notably. The maximum power saving ratio is 58.9% when the fresh air ratio is 20%; however, the ratio drops when the fresh air ratio increases. These findings will be beneficial in the selection of fresh air ventilation strategies for liquid desiccant based air-conditioning systems.     

压缩空气溶液除湿系统分析

为了祛除压缩空气中的水蒸气,采用溶液除湿系统对压缩空气进行干燥。建立了压缩空气溶液除湿系统的分析模型,进行了损率和效率计算。并和国内目前普遍使用的压缩空气冷冻除湿方法、冷冻-吸附除湿方法进行分析比较。结果表明,采用溶液除湿系统对压缩空气进行干燥的效率为62.5%,比常规的冷冻除湿系统57.4%和冷冻-吸附除湿系统57%更节能,具有较大的节能潜力。