In few years, stand-alone systems will rely on low-GWP refrigerants in order to reduce their direct impact, which agrees with the recent regulations and standards. However, the energy performance of the system is dependent on the refrigerant charge and thus on their annual leakage ratio. The leakage effect is not considered in the suggested methods to evaluate the environmental impact and requires an in deep analysis. We aim to extend the TEWI analysis of stand-alone refrigeration systems by considering a realistic evolution of their charge during its lifetime and to quantify the discrepancies of the classical methodology. For that, the performance of a stand-alone cabinet (four low-GWP refrigerants) has been considered as reference. It has been concluded that leakage consideration makes classical TEWI to underestimate emissions for any country, refrigerant or annual leakage ratio, up to 20% in this study. Deviation increases with higher leakage ratio, but especially for those values that do not imply a refilling during the lifetime of the system. Deviations are higher as mass and energy spans of the systems are.

未来几年，独立系统将依靠低全球升温潜能值的制冷剂以减少其直接影响，这与最近的法规和标准相符。但是，系统的能量性能取决于制冷剂充注量，并因此取决于它们的年泄漏率。建议的评估环境影响的方法未考虑泄漏效应，因此需要进行深入分析。我们的目的是通过考虑独立制冷系统在其使用寿命期间的实际费用演变来扩展TEWI分析，并量化经典方法的差异。为此，已将独立机柜（四种低GWP制冷剂）的性能作为参考。已经得出结论，泄漏的考虑使传统的TEWI可以低估任何国家的排放，制冷剂或年泄漏率，在本研究中高达20％。随着泄漏率的增加，偏差会增加，但是对于那些在系统寿命期内并不意味着重新填充的值，尤其如此。系统的质量和能量跨度越大，偏差就越大。