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武漢安德信恒溫恒濕試驗箱的制冷核心即為壓縮機，單級與復疊即為壓縮機的數量不同而區分的。當一臺恒溫恒濕試驗箱采用一(yi)臺壓縮機時(shi)，我(wo)們稱之為(wei)單級式制冷(leng)，采用一(yi)臺以(yi)上(shang)時(shi)，我(wo)們稱之為(wei)復疊(die)式制冷(leng)。

單級制冷機是應用比較廣泛的(de)一類制(zhi)(zhi)冷(leng)(leng)機，它可(ke)以應用于制(zhi)(zhi)冰、空(kong)調(diao)、食品冷(leng)(leng)藏及工業生產過(guo)(guo)程等方面(mian)。單(dan)級制(zhi)(zhi)冷(leng)(leng)循環是指制(zhi)(zhi)冷(leng)(leng)劑在制(zhi)(zhi)冷(leng)(leng)系統內相繼經過(guo)(guo)壓縮、冷(leng)(leng)凝、節流、蒸發四(si)個過(guo)(guo)程，便完成了(le)單(dan)級制(zhi)(zhi)冷(leng)(leng)機的(de)循環，即達到(dao)了(le)制(zhi)(zhi)冷(leng)(leng)的(de)目的(de)。

復疊式制冷機通常由兩(liang)個(ge)(ge)單獨的(de)制(zhi)冷(leng)(leng)(leng)系(xi)統(tong)組成，分(fen)(fen)別稱為高溫(wen)(wen)(wen)級(ji)及低(di)(di)溫(wen)(wen)(wen)級(ji)部(bu)分(fen)(fen)。高溫(wen)(wen)(wen)部(bu)分(fen)(fen)使(shi)(shi)(shi)用中溫(wen)(wen)(wen)制(zhi)冷(leng)(leng)(leng)劑，低(di)(di)溫(wen)(wen)(wen)部(bu)分(fen)(fen)使(shi)(shi)(shi)用低(di)(di)溫(wen)(wen)(wen)制(zhi)冷(leng)(leng)(leng)劑。高溫(wen)(wen)(wen)部(bu)分(fen)(fen)系(xi)統(tong)中制(zhi)冷(leng)(leng)(leng)劑的(de)蒸(zheng)(zheng)發是(shi)(shi)用來使(shi)(shi)(shi)低(di)(di)溫(wen)(wen)(wen)部(bu)分(fen)(fen)系(xi)統(tong)中制(zhi)冷(leng)(leng)(leng)劑冷(leng)(leng)(leng)凝(ning)，用一個(ge)(ge)冷(leng)(leng)(leng)凝(ning)蒸(zheng)(zheng)發器將兩(liang)部(bu)分(fen)(fen)起來，它(ta)既是(shi)(shi)高溫(wen)(wen)(wen)部(bu)分(fen)(fen)的(de)蒸(zheng)(zheng)發器，又是(shi)(shi)低(di)(di)溫(wen)(wen)(wen)部(bu)分(fen)(fen)的(de)冷(leng)(leng)(leng)凝(ning)器。低(di)(di)溫(wen)(wen)(wen)部(bu)分(fen)(fen)的(de)制(zhi)冷(leng)(leng)(leng)劑在蒸(zheng)(zheng)發器內向被冷(leng)(leng)(leng)卻(que)對象吸取熱量（即(ji)制(zhi)取冷(leng)(leng)(leng)量），并將此(ci)熱量傳給高溫(wen)(wen)(wen)部(bu)分(fen)(fen)制(zhi)冷(leng)(leng)(leng)劑，然后再由高溫(wen)(wen)(wen)部(bu)分(fen)(fen)制(zhi)冷(leng)(leng)(leng)劑將熱量傳給冷(leng)(leng)(leng)卻(que)介質（水或空氣）。