恒溫恒濕試驗箱是(shi)將(jiang)產(chan)品放置(zhi)在(zai)規定的溫度和濕(shi)(shi)(shi)度中(zhong)，看產(chan)品的耐(nai)高(gao)溫、耐(nai)低(di)溫、耐(nai)濕(shi)(shi)(shi)能力(li)，然(ran)后恒(heng)溫恒(heng)濕(shi)(shi)(shi)機(ji)具有加(jia)熱、降溫、加(jia)濕(shi)(shi)(shi)、降濕(shi)(shi)(shi)的能力(li)。

       1、在(zai)濕熱(re)試驗過(guo)程中，濕度(du)不能滿足規定(ding)的要求，哪里(li)有問(wen)題？

       分(fen)析(xi)：恒(heng)溫(wen)恒(heng)濕試(shi)驗箱在(zai)進行濕熱(re)試(shi)驗時(shi)，如果出現這種情況，

       (1)實際濕度(du)將達(da)到100%

       A.濕球傳感(gan)器上的紗布可(ke)能(neng)會干燥，所以需要(yao)檢查濕球傳感(gan)器的水(shui)槽是否(fou)缺(que)水(shui)。水(shui)槽內的水(shui)位(wei)由水(shui)位(wei)控(kong)制(zhi)器自動控(kong)制(zhi)，檢查水(shui)位(wei)控(kong)制(zhi)器的供水(shui)系統是否(fou)正常供水(shui)，水(shui)位(wei)控(kong)制(zhi)器是否(fou)正常工(gong)作。

       B.可能是濕球紗(sha)(sha)(sha)布(bu)使(shi)(shi)用(yong)時間長，或者(zhe)是供水(shui)水(shui)質純度高，會使(shi)(shi)紗(sha)(sha)(sha)布(bu)變(bian)硬，使(shi)(shi)紗(sha)(sha)(sha)布(bu)無法吸收水(shui)分，干燥(zao)。上(shang)述(shu)現象可以通過更換或清洗紗(sha)(sha)(sha)布(bu)來消除。

       (2)實際濕(shi)度與目(mu)標濕(shi)度有很(hen)大不(bu)同(tong)，數(shu)值要(yao)低得(de)多

       恒(heng)溫恒(heng)濕試驗箱的(de)(de)(de)加(jia)(jia)濕系(xi)統不工(gong)作，檢查(cha)加(jia)(jia)濕系(xi)統的(de)(de)(de)供水(shui)(shui)量，供水(shui)(shui)系(xi)統中是(shi)否有一定的(de)(de)(de)水(shui)(shui)量，加(jia)(jia)濕鍋爐的(de)(de)(de)水(shui)(shui)位控制(zhi)是(shi)否正常。如果以上一切(qie)都正常，就要檢查(cha)電氣控制(zhi)系(xi)統，請專業維修人員(yuan)維修。

       恒溫恒濕試驗箱(xiang)的溫度系統(tong)(tong)分為加濕和(he)除濕兩個子(zi)系統(tong)(tong)。

       加(jia)濕(shi)(shi)(shi)方法一般采用蒸汽加(jia)濕(shi)(shi)(shi)法，即(ji)直接將低壓蒸汽注入試驗空間進(jin)行加(jia)濕(shi)(shi)(shi)。這種加(jia)濕(shi)(shi)(shi)方法具有加(jia)濕(shi)(shi)(shi)能力、速度快、加(jia)濕(shi)(shi)(shi)控(kong)制(zhi)(zhi)靈敏，特別是降(jiang)溫時容易實(shi)現強(qiang)制(zhi)(zhi)加(jia)濕(shi)(shi)(shi)。

       除(chu)濕方法有(you)兩種:機械制(zhi)冷除(chu)濕和干燥除(chu)濕。機械制(zhi)冷除(chu)濕的除(chu)濕原(yuan)理是(shi)將空氣(qi)冷卻到(dao)露點溫(wen)度(du)以下，使大于飽(bao)和含濕量的水蒸氣(qi)凝結(jie)沉淀(dian)，從而降低濕度(du)。干燥器除(chu)濕是(shi)利(li)用氣(qi)泵將試驗箱(xiang)內的空氣(qi)抽出(chu)，注入(ru)(ru)干燥空氣(qi)，同時將濕空氣(qi)送入(ru)(ru)可回收干燥，干燥后送入(ru)(ru)試驗箱(xiang)，反(fan)復回收除(chu)濕。目前大部(bu)分綜合試驗箱(xiang)采用前除(chu)濕方法，后除(chu)濕方法可使露點溫(wen)度(du)達到(dao)0℃。適用于有(you)特(te)殊(shu)要(yao)求的昂貴場所。

       加(jia)(jia)(jia)熱(re)(re)裝置是(shi)(shi)控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)機(ji)(ji)恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)試驗箱(xiang)是(shi)(shi)否是(shi)(shi)加(jia)(jia)(jia)熱(re)(re)的關鍵環節；它是(shi)(shi)控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)器(qi)在(zai)(zai)獲得加(jia)(jia)(jia)熱(re)(re)指令時向繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)輸(shu)出電(dian)(dian)(dian)(dian)(dian)壓，在(zai)(zai)固(gu)(gu)態(tai)繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)上(shang)加(jia)(jia)(jia)入約3-12伏DC電(dian)(dian)(dian)(dian)(dian)源；它的交流端相當于連(lian)接(jie)電(dian)(dian)(dian)(dian)(dian)線；接(jie)觸器(qi)也同時吸(xi)入。加(jia)(jia)(jia)熱(re)(re)器(qi)兩端有電(dian)(dian)(dian)(dian)(dian)壓加(jia)(jia)(jia)熱(re)(re)。熱(re)(re)量(liang)通過循環風機(ji)(ji)帶動帶入箱(xiang)內(nei)，使(shi)恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)機(ji)(ji)加(jia)(jia)(jia)熱(re)(re)。那么溫(wen)(wen)度(du)很快就達到了你的設定(ding)值；控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)器(qi)通過加(jia)(jia)(jia)入固(gu)(gu)態(tai)繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)進行切(qie)斷和調節；我們在(zai)(zai)恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)機(ji)(ji)上(shang)看(kan)看(kan)屏幕上(shang)的加(jia)(jia)(jia)熱(re)(re)輸(shu)出是(shi)(shi)多少(shao)來調節發熱(re)(re)量(liang)；這是(shi)(shi)在(zai)(zai)89度(du)以上(shang)溫(wen)(wen)度(du)控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)，在(zai)(zai)89度(du)以下(xia)溫(wen)(wen)度(du)穩定(ding)如(ru)何(he)控(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)呢(ni)?恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)機(ji)(ji)是(shi)(shi)在(zai)(zai)一邊通過固(gu)(gu)態(tai)繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)發熱(re)(re)出力多少(shao);另通過壓縮機(ji)(ji)制(zhi)(zhi)(zhi)冷循環降溫(wen)(wen)達到動態(tai)平(ping)衡;溫(wen)(wen)度(du)恒(heng)(heng)定(ding)。

       冷(leng)(leng)(leng)卻(que)是(shi)(shi)(shi)恒溫(wen)(wen)(wen)恒濕試(shi)驗箱的重(zhong)要組(zu)成(cheng)部分，包括(kuo)壓縮機(ji)(ji)、冷(leng)(leng)(leng)凝(ning)器(qi)、節流(liu)(liu)裝置和蒸(zheng)(zheng)發(fa)器(qi)，是(shi)(shi)(shi)判斷恒溫(wen)(wen)(wen)恒濕機(ji)(ji)性能的重(zhong)要參數。壓縮機(ji)(ji)是(shi)(shi)(shi)制冷(leng)(leng)(leng)系(xi)統(tong)的心臟。它吸入低(di)溫(wen)(wen)(wen)低(di)壓氣體，成(cheng)為(wei)高(gao)溫(wen)(wen)(wen)高(gao)壓氣體，通(tong)過(guo)(guo)冷(leng)(leng)(leng)凝(ning)成(cheng)液體釋(shi)放熱(re)量，通(tong)過(guo)(guo)風扇帶走熱(re)量。因此，恒溫(wen)(wen)(wen)恒濕機(ji)(ji)是(shi)(shi)(shi)由熱(re)空氣引起的，然后(hou)通(tong)過(guo)(guo)節流(liu)(liu)到低(di)壓液體，然后(hou)通(tong)過(guo)(guo)蒸(zheng)(zheng)發(fa)器(qi)成(cheng)為(wei)低(di)溫(wen)(wen)(wen)低(di)壓氣體，最后(hou)返回壓縮機(ji)(ji)。制冷(leng)(leng)(leng)劑吸收蒸(zheng)(zheng)發(fa)器(qi)中的熱(re)量，完(wan)成(cheng)氣化過(guo)(guo)程，吸收熱(re)量，達(da)到制冷(leng)(leng)(leng)的目的，完(wan)成(cheng)恒溫(wen)(wen)(wen)恒濕機(ji)(ji)。

       恒溫恒濕(shi)試驗箱的(de)(de)(de)(de)相對(dui)濕(shi)度(du)(du)是(shi)絕對(dui)濕(shi)度(du)(du)與最高濕(shi)度(du)(du)的(de)(de)(de)(de)比率(lv)，其(qi)值顯(xian)示(shi)水蒸(zheng)(zheng)氣(qi)(qi)(qi)(qi)的(de)(de)(de)(de)飽(bao)和(he)度(du)(du)有多(duo)高，其(qi)單位(wei)為%。相對(dui)濕(shi)度(du)(du)為100%的(de)(de)(de)(de)空(kong)氣(qi)(qi)(qi)(qi)是(shi)飽(bao)和(he)空(kong)氣(qi)(qi)(qi)(qi)。相對(dui)濕(shi)度(du)(du)為50%的(de)(de)(de)(de)空(kong)氣(qi)(qi)(qi)(qi)含有一半的(de)(de)(de)(de)水蒸(zheng)(zheng)氣(qi)(qi)(qi)(qi)，達到相同溫度(du)(du)的(de)(de)(de)(de)空(kong)氣(qi)(qi)(qi)(qi)飽(bao)和(he)點。空(kong)氣(qi)(qi)(qi)(qi)中相對(dui)濕(shi)度(du)(du)超過100%的(de)(de)(de)(de)水蒸(zheng)(zheng)氣(qi)(qi)(qi)(qi)通常(chang)會凝結(jie)。隨著溫度(du)(du)的(de)(de)(de)(de)升高，空(kong)氣(qi)(qi)(qi)(qi)中能含的(de)(de)(de)(de)水越多(duo)，也就是(shi)說，相對(dui)濕(shi)度(du)(du)會隨著水蒸(zheng)(zheng)氣(qi)(qi)(qi)(qi)的(de)(de)(de)(de)增加而(er)降低。因此，在提供相對(dui)濕(shi)度(du)(du)的(de)(de)(de)(de)同時，還必須提供溫度(du)(du)計和(he)溫度(du)(du)計的(de)(de)(de)(de)數(shu)據。

       加(jia)(jia)濕(shi)系統(tong)和(he)加(jia)(jia)熱(re)系統(tong)大致相(xiang)同；恒(heng)(heng)溫恒(heng)(heng)濕(shi)試(shi)驗箱(xiang)是(shi)加(jia)(jia)熱(re)器(qi)加(jia)(jia)熱(re)水(shui)轉(zhuan)化為蒸汽的過程(cheng)；達到恒(heng)(heng)溫恒(heng)(heng)濕(shi)機加(jia)(jia)濕(shi)的目(mu)的。降濕(shi)系統(tong)也是(shi)通過制(zhi)冷(leng)系統(tong)完成的，蒸發器(qi)放(fang)置在恒(heng)(heng)溫恒(heng)(heng)濕(shi)試(shi)驗箱(xiang)中(zhong)；相(xiang)對較冷(leng)，恒(heng)(heng)溫恒(heng)(heng)濕(shi)機中(zhong)的高濕(shi)氣體(ti)會(hui)看到冷(leng)物體(ti)凝結(jie)成液體(ti)；這樣反復箱(xiang)體(ti)的高濕(shi)氣體(ti)會(hui)很少(shao)，達到降濕(shi)的目(mu)的。