系统制冷剂泄漏条件下客运车厢制冷剂浓度测量

[中文适用范围]： 本标准仅限于为乘用车和商用车的乘客室提供空调的制冷回路。本标准包括评估乘客舱内浓度的分析和物理测试程序。在车辆评估的早期阶段，使用分析方法可能就足够了，无需进行物理测试。物理测试程序涉及将制冷剂从外部源释放到蒸发器芯体附近的位置（HVAC 模块内部）。使用装置来提供可重复的校准泄漏率。如果系统有多个蒸发器，则可以在任何蒸发器位置模拟泄漏。该标准提供了有关测量 R-744 [CO2] 和 R-1234yf [HFO-1234yf]@ 的技术的详细信息，但此处描述的通用技术也可用于其他制冷剂。目的 本 SAE 标准的目的是提供统一的测试程序，以评估由于移动空调系统 (MAC) 制冷剂泄漏而导致车辆乘客室内部制冷剂浓度水平。本标准未规定浓度限值。制冷剂可能会从直接暴露于乘客舱或机舱空气分配系统的蒸发器@软管@管线@和连接器泄漏。制冷剂浓度受泄漏尺寸@制冷剂充注量@HVAC运行模式@车身密封@和车辆运行模式的影响。 [外文原描述]： This Standard is restricted to refrigeration circuits that provide air-conditioning for the passenger compartments of passenger and commercial vehicles.This Standard includes analytical and physical test procedures to evaluate refrigerant concentration inside the passenger compartment. In the early phases of vehicle evaluation, usage of the analytical approach may be sufficient without performing physical tests.The physical test procedure involves releasing refrigerant from an external source to a location adjacent to the evaporator core (inside the HVAC module). An apparatus is used to provide a repeatable, calibrated leak rate. If the system has multiple evaporators, leakage could be simulated at any of the evaporator locations.This standard gives detail information on the techniques for measuring R-744 (CO 2 ) and R-1234yf (HFO-1234yf), but the general techniques described here can be used for other refrigerants as well.Cross Reference: J2773_201702,J2842_201505,J639_201112,J639_202011