大連車載空調由壓(ya)(ya)(ya)縮(suo)(suo)機、冷(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)、節流(liu)元(yuan)件、蒸(zheng)(zheng)發器(qi)(qi)、風機及必要的(de)(de)控制部件構成(cheng)，用于調(diao)(diao)(diao)節車(che)(che)(che)內(nei)(nei)(nei)(nei)溫(wen)(wen)度、濕度，給乘員提(ti)供舒適(shi)(shi)環(huan)(huan)境(jing)的(de)(de)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系統(tong)。當(dang)壓(ya)(ya)(ya)縮(suo)(suo)機工作時，壓(ya)(ya)(ya)縮(suo)(suo)機吸(xi)(xi)入(ru)(ru)從蒸(zheng)(zheng)發器(qi)(qi)出來的(de)(de)低(di)溫(wen)(wen)低(di)壓(ya)(ya)(ya)的(de)(de)氣(qi)(qi)(qi)(qi)態制冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)，經(jing)壓(ya)(ya)(ya)縮(suo)(suo)，制冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)的(de)(de)溫(wen)(wen)度和(he)壓(ya)(ya)(ya)力(li)升(sheng)高(gao)(gao)，并被送(song)入(ru)(ru)冷(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)。在(zai)冷(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)內(nei)(nei)(nei)(nei)，高(gao)(gao)溫(wen)(wen)高(gao)(gao)壓(ya)(ya)(ya)的(de)(de)氣(qi)(qi)(qi)(qi)態制冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)把熱(re)量(liang)(liang)(liang)傳遞給經(jing)過(guo)(guo)冷(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)的(de)(de)車(che)(che)(che)外空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)而液化，變成(cheng)液體。液態制冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)流(liu)經(jing)節流(liu)裝置時，溫(wen)(wen)度和(he)壓(ya)(ya)(ya)力(li)降(jiang)低(di)，并進入(ru)(ru)蒸(zheng)(zheng)發器(qi)(qi)。在(zai)蒸(zheng)(zheng)發器(qi)(qi)內(nei)(nei)(nei)(nei)，低(di)溫(wen)(wen)低(di)壓(ya)(ya)(ya)的(de)(de)液態制冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)吸(xi)(xi)收經(jing)過(guo)(guo)蒸(zheng)(zheng)發器(qi)(qi)的(de)(de)車(che)(che)(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)熱(re)量(liang)(liang)(liang)而蒸(zheng)(zheng)發，變成(cheng)氣(qi)(qi)(qi)(qi)體。氣(qi)(qi)(qi)(qi)體又被壓(ya)(ya)(ya)縮(suo)(suo)機吸(xi)(xi)入(ru)(ru)進行下(xia)一(yi)輪循(xun)(xun)(xun)環(huan)(huan)。這樣，通(tong)過(guo)(guo)制冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)在(zai)系統(tong)內(nei)(nei)(nei)(nei)的(de)(de)循(xun)(xun)(xun)環(huan)(huan)，不(bu)斷吸(xi)(xi)收車(che)(che)(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)熱(re)量(liang)(liang)(liang)并排到車(che)(che)(che)外空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)中，使(shi)(shi)(shi)車(che)(che)(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)溫(wen)(wen)度逐漸下(xia)降(jiang)。內(nei)(nei)(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)可以(yi)提(ti)高(gao)(gao)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)(guo)，相(xiang)當(dang)于把室(shi)內(nei)(nei)(nei)(nei)冷(leng)(leng)(leng)(leng)(leng)(leng)空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)再制冷(leng)(leng)(leng)(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)(guo)當(dang)然更好(hao)了(le)。不(bu)過(guo)(guo)長時間(jian)使(shi)(shi)(shi)用內(nei)(nei)(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)會使(shi)(shi)(shi)車(che)(che)(che)內(nei)(nei)(nei)(nei)的(de)(de)空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質(zhi)量(liang)(liang)(liang)降(jiang)低(di)，可能(neng)(neng)讓(rang)(rang)人感(gan)覺(jue)頭(tou)昏腦(nao)漲。應當(dang)開一(yi)會兒內(nei)(nei)(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)就使(shi)(shi)(shi)用幾分鐘外循(xun)(xun)(xun)環(huan)(huan)，讓(rang)(rang)新鮮空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)進入(ru)(ru)車(che)(che)(che)內(nei)(nei)(nei)(nei)，改善空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質(zhi)量(liang)(liang)(liang)。如果(guo)(guo)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)(nei)(nei)(nei)外循(xun)(xun)(xun)環(huan)(huan)開關是(shi)機械式的(de)(de)撥(bo)桿而非(fei)按鈕，可以(yi)把撥(bo)桿放在(zai)內(nei)(nei)(nei)(nei)外循(xun)(xun)(xun)環(huan)(huan)的(de)(de)中間(jian)，讓(rang)(rang)車(che)(che)(che)外空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)適(shi)(shi)量(liang)(liang)(liang)進入(ru)(ru)，既(ji)能(neng)(neng)提(ti)升(sheng)空(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質(zhi)量(liang)(liang)(liang)，又能(neng)(neng)提(ti)高(gao)(gao)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)(guo)。此外，在(zai)使(shi)(shi)(shi)用空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除霜除霧時，要使(shi)(shi)(shi)用外循(xun)(xun)(xun)環(huan)(huan)才(cai)有效。