一汽汽车技术 空调 acloop3 13e ac loop overall description-1.ppt (NXPowerLite).pptVIP

f14 ac-rvi - Dimensionnement physique boucle AC AC LOOP OVERVIEW AC LOOP OVERVIEW AC LOOP PRINCIPLE (2/3) AC LOOP CYCLE ON DIAGRAM OF MOLLIER AC LOOP WITH AN EXPANSION VALVE AC LOOP WITH AN ORIFICE THE CONDENSER : TECHNOLOGIES THE EXPANSION VALVE (TXV) THE ORIFICE TUBE THE EVAPORATOR THE EVAPORATOR : FUNCTIONS To supply the required cooling power for the car cabin The required thermal power is defined during the theorical sizing of the A/C loop components. It depends on the thermal balance of the car cabine and on customer’s specification The evaporator is selected in the Valeo range to fit the thermal performance together with de contraintes : economical constraints car integration environment constraints THE DRIER RECEIVER FUNCTION 1 : To supply the expansion valve with liquid refrigerant To constitute a liquid reserve FUNCTION 2 : Dehumidification of the circulating fluid FUNCTION 3 : To filter solid impurities SOLUTIONS : Glass fibre disks with a hole for the diver tube Or thermoformed bags containing the desiccant and the filter, in an annulus THE ACCUMULATOR Accumulator functions: To supply the compressor with entirely gaseous refrigerant To dehumidify and filter the refrigerant / oil mixture To ensure that the oil returns to the compressor Principal characteristics of an accumulator : system used to separate liquid / vapour useful volume desiccant mass position of the oil return hole TUBES HOSES 五 点 最 合 理 的 反 映 1〕测量：至少每30000公里检测风量， 确认过滤网是否脏污过度 2〕查找：先查找泄漏点， 后补加R134a 3〕确认：确认补加的润滑油，O型圈（EPDM〕，是指定的产品，确保相融性 4〕精确：制冷剂、润滑油的加注量，多少都不利 5〕更换：最好每次检修、每两年更换储液罐 汽车文化 宣传正确的使用习惯 × 加强服务： Version APRIL 2001 ACLOOP3 - ACLOOP PEFORMANCES ANALYSIS * Condenser PC PW PF Expansion valve Evaporator GMV Compressor Receiver drier Pressure switch Condensor High pressure Low pressure Compressor Bottle Condenser HVAC unit Control panel PW (3) Compressor (1) Expansion valve Fluid Pressure Temperature 70°C20 bars 0°C3 bars High P, T° (4) Condenser PC T° ext PE Low P, T° (2)