大連車載空調由壓(ya)(ya)(ya)(ya)縮(suo)(suo)機、冷凝(ning)器、節流(liu)元(yuan)件、蒸(zheng)(zheng)發(fa)器、風(feng)機及必要(yao)的(de)(de)(de)控(kong)制(zhi)(zhi)(zhi)(zhi)部件構成(cheng)，用(yong)(yong)(yong)于調(diao)節車(che)內(nei)溫(wen)度(du)(du)、濕(shi)度(du)(du)，給乘員提供舒適環境的(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)調(diao)系統(tong)。當(dang)壓(ya)(ya)(ya)(ya)縮(suo)(suo)機工作時，壓(ya)(ya)(ya)(ya)縮(suo)(suo)機吸(xi)入(ru)從蒸(zheng)(zheng)發(fa)器出來的(de)(de)(de)低溫(wen)低壓(ya)(ya)(ya)(ya)的(de)(de)(de)氣(qi)(qi)(qi)態(tai)制(zhi)(zhi)(zhi)(zhi)冷劑(ji)，經(jing)(jing)壓(ya)(ya)(ya)(ya)縮(suo)(suo)，制(zhi)(zhi)(zhi)(zhi)冷劑(ji)的(de)(de)(de)溫(wen)度(du)(du)和(he)壓(ya)(ya)(ya)(ya)力升高，并(bing)(bing)被送入(ru)冷凝(ning)器。在冷凝(ning)器內(nei)，高溫(wen)高壓(ya)(ya)(ya)(ya)的(de)(de)(de)氣(qi)(qi)(qi)態(tai)制(zhi)(zhi)(zhi)(zhi)冷劑(ji)把熱量(liang)(liang)(liang)傳遞給經(jing)(jing)過(guo)冷凝(ning)器的(de)(de)(de)車(che)外空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)而(er)液(ye)化，變成(cheng)液(ye)體(ti)。液(ye)態(tai)制(zhi)(zhi)(zhi)(zhi)冷劑(ji)流(liu)經(jing)(jing)節流(liu)裝置(zhi)時，溫(wen)度(du)(du)和(he)壓(ya)(ya)(ya)(ya)力降(jiang)(jiang)低，并(bing)(bing)進(jin)入(ru)蒸(zheng)(zheng)發(fa)器。在蒸(zheng)(zheng)發(fa)器內(nei)，低溫(wen)低壓(ya)(ya)(ya)(ya)的(de)(de)(de)液(ye)態(tai)制(zhi)(zhi)(zhi)(zhi)冷劑(ji)吸(xi)收經(jing)(jing)過(guo)蒸(zheng)(zheng)發(fa)器的(de)(de)(de)車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)熱量(liang)(liang)(liang)而(er)蒸(zheng)(zheng)發(fa)，變成(cheng)氣(qi)(qi)(qi)體(ti)。氣(qi)(qi)(qi)體(ti)又(you)被壓(ya)(ya)(ya)(ya)縮(suo)(suo)機吸(xi)入(ru)進(jin)行下一(yi)輪循(xun)(xun)環。這樣，通(tong)過(guo)制(zhi)(zhi)(zhi)(zhi)冷劑(ji)在系統(tong)內(nei)的(de)(de)(de)循(xun)(xun)環，不(bu)斷(duan)吸(xi)收車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)熱量(liang)(liang)(liang)并(bing)(bing)排到車(che)外空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)中(zhong)，使(shi)車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)溫(wen)度(du)(du)逐漸(jian)下降(jiang)(jiang)。內(nei)循(xun)(xun)環可以提高空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果(guo)(guo)，相當(dang)于把室內(nei)冷空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)再(zai)制(zhi)(zhi)(zhi)(zhi)冷，空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果(guo)(guo)當(dang)然更好(hao)了(le)。不(bu)過(guo)長(chang)時間使(shi)用(yong)(yong)(yong)內(nei)循(xun)(xun)環會使(shi)車(che)內(nei)的(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)(liang)降(jiang)(jiang)低，可能讓(rang)人感覺(jue)頭昏腦(nao)漲(zhang)。應(ying)當(dang)開一(yi)會兒內(nei)循(xun)(xun)環就使(shi)用(yong)(yong)(yong)幾分(fen)鐘外循(xun)(xun)環，讓(rang)新鮮空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)進(jin)入(ru)車(che)內(nei)，改善空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)(liang)。如果(guo)(guo)空(kong)(kong)(kong)(kong)(kong)調(diao)內(nei)外循(xun)(xun)環開關是機械式的(de)(de)(de)撥桿而(er)非按鈕(niu)，可以把撥桿放在內(nei)外循(xun)(xun)環的(de)(de)(de)中(zhong)間，讓(rang)車(che)外空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)適量(liang)(liang)(liang)進(jin)入(ru)，既能提升空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)(liang)，又(you)能提高空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果(guo)(guo)。此外，在使(shi)用(yong)(yong)(yong)空(kong)(kong)(kong)(kong)(kong)調(diao)除霜除霧時，要(yao)使(shi)用(yong)(yong)(yong)外循(xun)(xun)環才有效(xiao)。