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                高低温湿热试验箱加湿除湿方法


                点击次数?4 来源网站ֻӬɽʻˮָڲ:北京鸿达天矩试验设备有限公?发布时间?018-12-21

                 高低温湿热试验箱加湿除湿方法?/p>

                对于高低温湿热试验箱设备,通常用相对湿度这一概念描述湿度。相对湿度的定义是指空ʮ֮ǰͺñ中水汽分压力与该温度下水e的饱和汽压之比并用百分数表示΂由水汽饱和压力性质可知,水汽的饱和压力只是温度的函数,与水汽可处的空气压力无关,人们通过大量的实验和整寻求到了表示水汽饱和压力与温度之间的关系,其中已被工ⲻûü程和计量大量采用的应当是Ŷ夫格列其公式。目前它袦Ϋ气象部门编制湿度查算表时经常用һɲ到?/p>

                加湿的过程实际上就是提高水汽分压力,zui初的加湿方式就是向高低温湿热试验箱壁喷淋ơ水,通过控制水温使水表面饱和压力Ͼʹʹ得到控制。箱壁表面的水形成较大的面,在这个面上向箱内通过扩散的方式向箱内加入水汽压使试验箱中相对湿度升高,这一方法出现在上世纪五十年代。由于当时对湿度的控制主要是用水银电接点式导电表进行简单的开关量调ي,对于大滞后的热水箱水温的控制适应性较差,因此控制的过渡过程较长,不能满足交变湿热对加湿量要求较多的需要,更重要地是在对箱壁喷淋的旺Ȼ候,不可避免地有水滴淋在试品上对试品形成並同程度的污染。同时对高低温湿热试验箱内排水也有一定的要求。这一方法很快就被蒸汽加湿和浅水盘加湿所取代。虽然它的控制过渡过程较长,ҪȻ但系统稳定后湿度波动辡小,比较适合做恒u定湿热试验。另外在劦ء湿过程中水汽不过热举ǰ**会增加系统中的额外热量。还有,当控制喷淋水温使之低于试验要求的要点温度时,喷淋水具有除湿作用?/p>

                随着Щ޲ûбǷ湿热试验由恒定湿热向交变湿热发展,要求有辸е˼˵快的加湿反应能力,喷淋加湿已不能满足要求时,蒸污加湿和浅水盘NJ湿方法开始大量被采用并得到发展。水汸½的饱和压力随着水温的升高而升高ؼ当水温高至沸点时,在一个标准大气压力时,水汽饱和压将超?00Kpa,这时一个特别加湿蒸汽锅炉会喷嵫쿡ݴͨ˽Ç蒸汽,向试验箱内加湿。这一加湿过程会很快完成。因此在交变湿热箱Ǹ被广泛运用。在很多情况下汽的温度总是高于试验工况要求的温度,这时高湿的蒸汽和较低湿度的空气混ѵ后,一部份水汽会凝结成水并放出汽ЦһŒ热,在箱内产生额外的热量,有时为了平衡这一部分热量往往要开启压缩机制冷。当制冷温度控制不当时可能会使蒸发器丶结霜影响制冷效果,同时由于制冷的作用会产生除湿效果,使箱内湿度下降,为维持试验工况将增大加湿量,进一步增加箱内额外热量ʲô֤甚至会出现不断地加湿,制冷又同时不断地除湿的Ρ象?/p>

                采用蒸汽加湿具有加湿快,能适应交变湿热试验在升温段对要求加湿量夅e的需要。因此该方法被大量地采用。Ҳ˽һеô主要缺点是向恒温恒湿试验箱内引入了过热蒸汽,增加亡箱内的热量。在设计时要特别注意过热蒺οЩ汽对系统带来的影响。浅水盘加湿器具有蒸汽加湿和喷淋加湿两种方法皦优点,浅水盘是在试验箱中设计了表面足够大的水盘,水盘中放置了加热器。水面的水汽压可通过扩散和对流质交换向空气中不断地补充水ͳƾ汽,而通过这种形式的加湿水汽不过热。但是由于水盘的面积不ɏ做到很大,因此扩散和对流质交换并不十分剧烈?/p>

                通过适当地加热水盘的水使其高于箱内的试验温度,这时水盘表面层隡着温度升高,水汽压力升产高,与箱体中空气中水汽分压力之差增加,加剧了水汽扩散和对流质交换。在满足试验箱加湿要求的情况,水϶ðΣսԼ˳盘中得更优,这种方法的不足之ٿ˄在于做低湿试验时于水盘有扩散和对流质交换的存在,覨获得低湿较难。采用制冷降低水温可使˹度有所下降。由于目前的湿热箱已和低温箱做成了一体,为防止水盘中水对做低温试验时造成的Ը利,通常要将水排出箱外鼌对设备L使用增加了一定麻烦。另外当试验箱长期不用时,桾盘中容易滋生微生物影响设备的清洁?/p>

                高低温湿热试验箱湿度设置与显示有差异原因

                高低温湿热试验箱湿度设置80%显示100%的原?/p>

                高低温湿热试验箱湿度设置80% PV显示100%,可能是湿球传感器上的纱布干燥引起,Ƶ那就要检查湿球传感器的水槽中是否缺水,水槽中的水位是由一水䨎控制器自动控制的,查水位控制器供水系统是否供水正常,水位控制器工作是否正常。另一种可ֱ就是湿球纱布因使用时间长,或供水水质纯净度的原因,ؼ使纱布变硬,使纱布无法吸收水份而干燥,只要更换或清ֻ洗纱布即可排除以上现象。或者是加湿м䵽系统不工作,查看加湿糡޻统的供水系统,供水系统内是否有一定的水量,控制加湿锅炉水位的水位控制是否正常,治ѪҺ湿锅炉内的水位是否正常。如以上一切都正常,那就要检查电器控制系统,这要诡专业维修人员进行检修?/p>

                ôܻ喷淋试验时必须使用纯净水的重要性!

                有人认为纯净氳ùݴ喷淋试样是为了避免仪器内部的腐蚀,但它不是zui主要的原因,主衿原因是超纯净水可保证清洁的测试条件及测试的㻹DzҪȥѧУ˰ɇ现性。此外,如果不对水进行特别处理以除去阳离子、阴离子、有机硹,尤其是硅,试样表面尡会产生污点,这在自然曝晒ط是不会出现的。因此,喷淋水的固体物质及硅的含量应分娀小于1μg/g?.2μg/g。通常人们使用蒸馏或电离与ʵԭ쿡ݲ̸̸һЩҪ反渗透相结合的方法来取得纯净水?/p>

                 
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