The aim of this study was to evaluate the equations for calculating the clothing area factor (f_cl) used in the standards based on data sets of clothing ensembles, that are meant to provide thermal comfort over a wide range of climatic conditions from hot summer days to extremely cold winter. Over 10 equations for f_cl calculations were selected from the international standards and the literature. At first a theoretical comparison based on a range of insulation values was performed. Then the data sets were used to compare the equations and measurements on real clothing systems. Most of the f_cl calculation equations do give reasonably good results for western type and industrial clothing with basic insulation (I_cl) up to 1.5 clo. Above the I_cl of 2 clo, the error in the calculations based on traditional equations increases considerably and they overestimate f_cl. Some new equations were suggested for modern clothing systems. Oppositely, for non-western clothing (for hot climate), the available equations did give good match only for very light clothing sets and commonly underestimated the real f_cl. For such sets and and fashion clothes their own equations maybe needed, that count for various design aspects, e.g. fit, draping etc.

本研究的目的是评估用于计算标准中使用的服装面积系数 ( f _cl )的公式，这些公式基于服装套装的数据集，旨在从炎热的夏季开始在各种气候条件下提供热舒适性。到极冷的冬天。从国际标准和文献中选择了10 多个用于f _cl计算的方程。首先进行了基于一系列绝缘值的理论比较。然后使用数据集来比较真实服装系统上的方程和测量值。大多数f _cl计算方程确实为具有基本绝缘的西式和工业服装提供了相当好的结果（我_cl ) 高达 1.5 clo。在2 clo的I _cl之上，基于传统方程的计算中的误差显着增加并且他们高估了f _cl。为现代服装系统提出了一些新的方程式。相反，对于非西方服装（对于炎热气候），可用的方程式确实仅适用于非常轻的服装套装，并且通常会低估真实的f _cl。对于此类套装和时尚服装，可能需要他们自己的方程式，这些方程式考虑到各种设计方面，例如合身、悬垂等。