在过去的十年里，使用氢氟碳（HFC）直接膨胀（DX）系统替代超市制冷的技术继续引起人们的兴趣。这类替代系统的市场在欧洲已经繁荣了好几年，在北美也开始出现一些势头。使用新型制冷系统的一个尚未解决的主要问题是准确测量能耗，以便进行系统比较。讨论了准确能耗的动机，以及已发表的现场结果。由于能耗较大，低温系统是讨论的主要焦点。然而，讨论的问题也与中温系统有关。本文介绍了制定系统性能比较所需的因素，并讨论了进行测试以确定这些因素的影响的必要性。引用: Ashrae Transactions 2015，第121卷，第1页。佐治亚州亚特兰大2号

Over the past decade, the use of technologies that arealternatives to the hydrofluorocarbon (HFC) direct-expansion(DX) systems for supermarket refrigeration have continued togarner interest. The market for such alternative systems hasbeen thriving for several years in Europe and is beginning togain some momentum in North America. One of the majorunresolved issues with use of novel refrigeration systems isobtaining an accurate measurement of the energy consumptionfor system comparison. The motivation for having accurateenergy consumption is discussed along with field results thathave been published. Low-temperature systems are the mainfocus of the discussion due to the larger energy consumption.However, the issues discussed also pertain to medium-temperaturesystems. The factors necessary to formulate a propercomparison of systems are presented as well as a discussion ofthe need to perform testing to determine the impact of thesefactors.