制冷(leng)系(xi)(xi)統(tong)(tong)、加熱系(xi)(xi)統(tong)(tong)、控制系(xi)(xi)統(tong)(tong)、溫度系(xi)(xi)統(tong)(tong)、空(kong)氣循環系(xi)(xi)統(tong)(tong)和(he)(he)傳感(gan)器系(xi)(xi)統(tong)(tong)六個部分組成，上述系(xi)(xi)統(tong)(tong)分屬電氣和(he)(he)機械(xie)制冷(leng)兩大方面。幾個主要(yao)系(xi)(xi)統(tong)(tong)的工作(zuo)原理和(he)(he)工作(zuo)過(guo)程如(ru)下：
1、制(zhi)冷系(xi)統：恒(heng)溫恒(heng)濕試驗(yan)箱的(de)制(zhi)冷系(xi)統是恒(heng)溫恒(heng)濕試驗(yan)箱的(de)重要(yao)組成(cheng)部分之一。
2、加(jia)(jia)熱系(xi)統：恒(heng)溫(wen)(wen)恒(heng)濕(shi)試(shi)(shi)(shi)驗(yan)箱(xiang)(xiang)的(de)(de)(de)加(jia)(jia)熱系(xi)統相對制冷系(xi)統而言，是比較(jiao)(jiao)簡單。它(ta)主要有(you)(you)大功(gong)率(lv)電阻絲組(zu)成，由于(yu)恒(heng)溫(wen)(wen)恒(heng)濕(shi)試(shi)(shi)(shi)驗(yan)箱(xiang)(xiang)要求的(de)(de)(de)升溫(wen)(wen)速率(lv)較(jiao)(jiao)大，因此(ci)試(shi)(shi)(shi)驗(yan)箱(xiang)(xiang)的(de)(de)(de)加(jia)(jia)熱系(xi)統功(gong)率(lv)都比較(jiao)(jiao)大，而且在(zai)試(shi)(shi)(shi)驗(yan)箱(xiang)(xiang)的(de)(de)(de)底板也設(she)有(you)(you)加(jia)(jia)熱器。
