本SAE推荐规程的目的是建立统一的试验程序，用于测量和评定卡车驾驶室空调蒸发器总成的空气输送和冷却能力。其目的是仅测量蒸发器的实际冷却能力。本推荐规程的目的不是对整个车辆空调系统的性能进行评级和比较。本程序旨在为卡车制造商和空调系统供应商提供一种经济高效、标准化的测试方法和计算方法，用于测量和评估卡车驾驶室空气的空气输送和冷却能力- 空调蒸发器总成。本程序涉及HFC-134a（R-134a）制冷剂系统。

The purpose of this SAE Recommended Practice is to establish uniform test procedures for measuring and rating air delivery and cooling capacity of truck cab air-conditioner evaporator assemblies. It is the intent to measure only the actual cooling capacity of the evaporator. It is not the intent of this recommended practice to rate and compare the performance of the total vehicle air-conditioning system.This procedure is designed to provide truck manufacturers and air conditioning system suppliers with a cost-effective, standardized test method and calculations for measuring and rating air delivery and cooling capacity of truck cab air-conditioner evaporator assemblies. This procedure relates to HFC-134a (R-134a) refrigerant system.