AHRI标准550-590《使用蒸汽压缩循环的水冷却和热泵热水机组性能评级标准》最近进行了更新。本标准的新版本包括热泵热水器，通过包括气压调节和见证试验实验室要求，扩展了风冷冷水机的试验选项，并对IPLV的用途和使用进行了扩展讨论。引文:伊利诺伊州芝加哥ASHRAE会议论文

AHRI Standard 550-590, Standard for Performance Rating of Water–Chilling and Heat Pump Water-Heating Packages Using the Vapor Compression Cycle, has recently undergone updates. The new version of this standard includes heat pump water heaters, expands the testing options for air-cooled chillers by including a barometric pressure adjustment and witness test labrequirements and provides an expanded discussion of the purpose and use of IPLV.