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     中國地理環境決定,一年之中 20℃以下的環境氣溫約占一半的時間,因此,制冷式除濕效果受季節溫度影響很大.近年來市場上出現了一種利用半導體制冷片的"帕爾貼"效應, 將空氣中的水分進行冷凝排除 的"電子防潮箱",由于此類產品仍屬于制冷式除濕, 也存在傳統制冷除濕方式(shi)所(suo)存在的一切 通病.因此限制了其(qi)應用范(fan)圍(wei). 所(suo)謂相(xiang)對濕度, 是(shi)指在特定(ding)空(kong)間體積內一定(ding) 的空(kong)氣(qi)含(han)水量相(xiang)當(dang)于當(dang)時氣(qi)溫(wen)氣(qi)壓而形成(cheng)的空(kong)氣(qi)濕度值(zhi).

     吸潮(chao)劑(ji)(ji)除濕(shi)方式 將(jiang)硅膠等干(gan)燥劑(ji)(ji)放入密(mi)封的(de)容器內(nei)(nei)進行(xing)除濕(shi), 是(shi)最常(chang)見的(de)除濕(shi)辦(ban)法(fa). 其缺點是(shi)當吸潮(chao)劑(ji)(ji)飽(bao)(bao)和 時需(xu)要更(geng)(geng)換或人工進行(xing)烘干(gan)再生(sheng), 長年累(lei)月曠日持久的(de)維護工作相當繁雜; 由于吸潮(chao)劑(ji)(ji)飽(bao)(bao)和 時間不(bu)(bu)易準確預見, 容器內(nei)(nei)濕(shi)度究竟是(shi)多少也(ye)不(bu)(bu)能靠是(shi)似(si)而非(fei)的(de)硅膠變色程度確切得知, 非(fei)常(chang)容易導(dao)致不(bu)(bu)能及時恰當更(geng)(geng)換吸潮(chao)劑(ji)(ji).

     由于密(mi)封(feng)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)空氣(qi)(qi)與外界空氣(qi)(qi)隔 絕(jue), 容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)空氣(qi)(qi)絕(jue)對(dui)(dui)含水(shui)(shui)量(liang)(liang)不(bu)(bu)會(hui)減少或增加(jia), 容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)水(shui)(shui)份(fen)含量(liang)(liang)是固(gu)定不(bu)(bu)變的(de)(de), 而容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)相(xiang)對(dui)(dui) 濕(shi)(shi)度(du)(du)(du)(du)因(yin)受外界溫(wen)度(du)(du)(du)(du)氣(qi)(qi)壓(ya)升降影響, 會(hui)發(fa)生濕(shi)(shi)度(du)(du)(du)(du)升降.例如,在一(yi)密(mi)封(feng)玻璃瓶罐容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)放置一(yi) 個指(zhi)針式濕(shi)(shi)度(du)(du)(du)(du)表(biao)(biao)觀察(cha),如此(ci)時(shi)環境氣(qi)(qi)溫(wen)為 25℃,而濕(shi)(shi)度(du)(du)(du)(du)表(biao)(biao)指(zhi)示容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)濕(shi)(shi)度(du)(du)(du)(du)為RH60%,則(ze) 將該容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)放入溫(wen)度(du)(du)(du)(du)只有 6-9℃的(de)(de)冰箱冷(leng)藏室(shi),半小時(shi)后開(kai)冰箱門觀察(cha),容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)的(de)(de)濕(shi)(shi)度(du)(du)(du)(du)表(biao)(biao)指(zhi)示 現在的(de)(de)濕(shi)(shi)度(du)(du)(du)(du)值上升為 RH75%,再(zai)將該容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)取(qu)出(chu),放置與室(shi)外日光(guang)暴曬下,半小時(shi)后觀察(cha), 容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)的(de)(de)濕(shi)(shi)度(du)(du)(du)(du)表(biao)(biao)指(zhi)示現在的(de)(de)濕(shi)(shi)度(du)(du)(du)(du)值下降為為 RH15%,由此(ci)證明,在密(mi)封(feng)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)絕(jue)對(dui)(dui)含水(shui)(shui)量(liang)(liang) 不(bu)(bu)會(hui)改變的(de)(de)情況下,環境溫(wen)度(du)(du)(du)(du)的(de)(de)變化,回導致(zhi)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)(qi)(qi)(qi)內(nei)(nei)相(xiang)對(dui)(dui)濕(shi)(shi)度(du)(du)(du)(du)的(de)(de)變化.

     因(yin)此(ci), 采用(yong)密封(feng)容(rong)(rong)器 放置(zhi)硅膠(jiao)來干燥(zao)的(de)方法(fa), 由(you)于晝(zhou)夜及季節(jie)的(de)環境條(tiao)件(jian)在發生變(bian)化, 在一(yi)定(ding)(ding)氣(qi)溫氣(qi)壓條(tiao)件(jian)和(he)吸 潮劑經使用(yong)到一(yi)定(ding)(ding)情(qing)況條(tiao)件(jian)下, 容(rong)(rong)器內有可出(chu)(chu)現(xian)不(bu)(bu)(bu)但不(bu)(bu)(bu)干燥(zao), 還會產(chan)生高濕(shi)(shi)的(de)情(qing)況, 甚(shen)至導(dao) 致(zhi)容(rong)(rong)器壁上出(chu)(chu)現(xian)結(jie)露出(chu)(chu)水.此(ci)外, 當新(xin)的(de)吸潮劑放入(ru)容(rong)(rong)器時, 由(you)于投放吸潮劑的(de)數量不(bu)(bu)(bu)易掌(zhang) 握(wo),過少(shao)濕(shi)(shi)度降不(bu)(bu)(bu)下來, 過多則會出(chu)(chu)現(xian)濕(shi)(shi)度過低, 可能(neng)會對(dui)某些物(wu)品(pin)造(zao)成(cheng)危害(hai), 如造(zao)成(cheng)光學 儀器的(de)電(dian)(dian)子器件(jian)中的(de)集成(cheng)電(dian)(dian)路靜電(dian)(dian)擊穿(chuan), 有機零件(jian)開(kai)裂, 開(kai)膠(jiao), 影像膠(jiao)片產(chan)生靜電(dian)(dian)枝狀網(wang)紋 等(deng).并且(qie)當使用(yong)一(yi)段(duan)時間后, 由(you)于不(bu)(bu)(bu)能(neng)準確預料(liao)及時更換, 又(you)會出(chu)(chu)現(xian)濕(shi)(shi)度過高情(qing)況, 容(rong)(rong)器內 濕(shi)(shi)度不(bu)(bu)(bu)穩(wen)定(ding)(ding), 對(dui)存放物(wu)品(pin)不(bu)(bu)(bu)利.由(you)于上述(shu)原(yuan)因(yin), 使用(yong)吸潮劑保(bao)存物(wu)品(pin)安全性不(bu)(bu)(bu)高.

    制冷式除濕機電耗(hao)巨大, 一般(ban)(ban) 30立方(fang)米空間(jian)(jian)房間(jian)(jian)電耗(hao)約為 1kw/小時,運行費(fei)用高(gao). 制(zhi)冷式(shi)(shi)除(chu)(chu)(chu)濕(shi)(shi)機的(de)除(chu)(chu)(chu)濕(shi)(shi)能(neng)力有限, 一般(ban)(ban)只能(neng)將濕(shi)(shi)度(du)控制(zhi)在 50%-60%左右. 對于(yu)作為干燥(zao)工(gong)具, 要(yao)求(qiu)達(da)到 30%以下濕(shi)(shi)度(du)要(yao)求(qiu)的(de)場合,制(zhi)冷式(shi)(shi)除(chu)(chu)(chu)濕(shi)(shi)機不能(neng)勝(sheng)任(ren). 盡(jin)管制(zhi)冷式(shi)(shi)除(chu)(chu)(chu)濕(shi)(shi)機存在上述嚴重缺陷, 在沒有更好的(de)除(chu)(chu)(chu)濕(shi)(shi)手段條件下, 使用制(zhi)冷式(shi)(shi)除(chu)(chu)(chu)濕(shi)(shi)機也 不失(shi)為一種聊勝(sheng)于(yu)無(wu)的(de)辦法(fa),因(yin)此也在被大量生(sheng)產(chan)銷售.