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 高低溫交變試驗箱制冷工作原理：制冷循環采用逆卡若循環，該循環出兩個等溫過程和兩個絕熱過程組成，其過程如下：制冷劑經壓縮機絕熱壓縮到較高的壓力，消耗了的功使排氣溫度升高，之后制冷劑經冷凝器等溫地和四周介質進行熱交換將熱量傳給四周介質。后制冷劑經截流閥絕熱膨脹做功，這時制冷劑溫度降低。后制冷劑通過蒸發器等溫地從溫度較高的物體吸熱，使被冷卻物體溫度降低。此循環周而復始從而達到降溫之目的，高低溫循環試驗箱之制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)系(xi)(xi)(xi)統(tong)(tong)采(cai)用(yong)1套法國產泰康全封閉壓縮機(ji)所(suo)組成(cheng)的(de)(de)單(dan)元(yuan)氟利(li)昂(ang)制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)系(xi)(xi)(xi)統(tong)(tong)。制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)系(xi)(xi)(xi)統(tong)(tong)的(de)(de)設(she)計應用(yong)能(neng)量調(diao)節技(ji)術,既能(neng)保證(zheng)制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)機(ji)組正常運行,又能(neng)對制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)系(xi)(xi)(xi)統(tong)(tong)的(de)(de)能(neng)耗及(ji)制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)量進(jin)行有效的(de)(de)調(diao)節，使制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)系(xi)(xi)(xi)統(tong)(tong)保持(chi)在(zai)佳的(de)(de)運行狀(zhuang)態。采(cai)用(yong)平衡調(diao)溫（BTC）,既在(zai)制(zhi)(zhi)(zhi)(zhi)冷(leng)(leng)系(xi)(xi)(xi)統(tong)(tong)在(zai)連(lian)續工作的(de)(de)情(qing)況下，控(kong)制(zhi)(zhi)(zhi)(zhi)系(xi)(xi)(xi)統(tong)(tong)根據(ju)設(she)定(ding)之溫度點(dian)通過(guo)PID自(zi)動(dong)運算輸出的(de)(de)結(jie)果(guo)去控(kong)制(zhi)(zhi)(zhi)(zhi)加熱(re)器的(de)(de)輸出量，終(zhong)達到(dao)一種動(dong)態平衡。