Abstract:

According to the standards describing research on the total and resultant thermal insulation, the requirements for the microclimate in which tests are performed must be recorded. However, these values are given with uncertainty. According to the EN ISO 15831 and EN 342 standards, air velocity should be set to (0.4 ± 0.1) m/s. For this reason, it is necessary to verify to what extent values exceeding the said range affect the results of the thermal insulation. Research was carried out for 3 sets of clothing differing in the number of layers of the material. The influence of air velocity on clothing thermal insulation was examined with three values of V_a, : 0.4 m/s, 0.8 m/s and 1.2 m/s. Correction factors (CFs) were calculated and compared with the CF values set out in the EN ISO 9920 standard.